Tullie_Met_Data

 

 

 

 

 

 

 

 

 

 

 

Statistically, October was a rather strange month.  Extending the comparison table given last year we see that it was extremely warm, almost the driest of the last five years, but at the same time the windiest.

 

October statistics (°C, mms, km/h)
Year Average Temperature Total Rain Average Wind
2017 10.04 52 8.5
2016
8.62 61 7.1
2015 8.82 51 6.1
2014 8.81 108 8.4
2013 8.75 117 7.8
2012 5.60 91

4.6

 

With a total of only 52.2 mms of rain during the month the annual total remains on course for being a record low. A remarkable maximum temperature of 17.7°C was reached on the 15th and the first frost (-2.7 °C) felt on the 30th giving a frost-free season of 188 days.

 

 

 (Reload images if you still see the old versions from your cache)

Archive plots: (click on images when they appear to enlarge them)


Four years of plots compared -  Sun   Rain   Temperature


Monthly plots

Jan-2017  Feb-2017  Mar-2017  Apr-2017  May-2017  Jun-2017

Jul-2017   Aug-2017  Sep-2017  Oct-2017

 

2016  annual plots.  Temperature  Sun  Rain

Monthly plots

Jan-2016  Feb-2016  Mar-2016  Apr-2016  May-2016  Jun-2016  

Jul-2016   Aug-2016  Sep-2016  Oct-2016  Nov-2016  Dec-2016


2015  annual plots.  Temperature  Sun  Rain

Monthly plots

Jan-2015   Feb-2015   Mar-2015  Apr-2015  May-2015  Jun-2015 

Jul-2015  Aug-2015  Sep-2015  Oct-2015  Nov-2015 Dec-2015


2014 annual plots.   Temperature  Sun  Rain

Monthly plots

Jan-2014   Feb-2014   Mar-2014   Apr-2014   May-2014  Jun-2014

Jul-2014   Aug-2014   Sep-2014  Oct-2014  Nov-2014  Dec-2014


2013 annual plots.  Temperature  Sun  Rain 

Monthly plots

Jan-2013  Feb-2013  Mar-2013  Apr-2013  May-2013  Jun-2013

Jul-2013  Aug-2013  Sep-2013  Oct-2013  Nov-2013  Dec-2013

 

Daily extremes since March 2012
 Maximum temperature  12th Jul 2013 26.5 °C
 Minimum temperature  13th Dec 2012 -7.8 °C
 Lowest high 24hr temperature  11th Dec 2012 -2.2 °C
 Highest low 24hr temperature   23rd/24th July 2013  15.7 °C
 Wettest  20th Dec 2012  52.8 mm
 Windiest (gust)  5th Dec 2013   93.3 km/h 
 Sunniest (total radiation)

 10th Jun 2015

1st Jun 2016

694.1 Ly*

692.4  Ly

 Dullest (total radiation)  14th Nov 2014 3.5 Ly
  Lowest pressure                       27th Dec 2013       951.7 hPa
  Highest pressure      7th Feb 2015 1040.7 hPa

* The amount of accumulated solar radiation energy (aka sunlight) over a period of time is here recorded in Langleys (Ly).  1 Langley is equivalent to 41.84 kJ/m2.

Hectopascal (hPa) is the official pressure unit and is equivalent to 1 millibar.

 

Cloudless days

27 March 2012

26 May 2012
25 May 2013
19 July 2013
12 March 2014
1 October 2015
19 March 2016
1 June 2016
5 May 2017
 
 
 

 

Old monthly reports:

 

September 2017

 

 

September blotted its copybook by not only failing to grab the "driest month" crown but by doing it in style with a soggy 80.0 mms - the wettest of the last five years.  Only 8 days failed to register some precipitation. The annual total remains unremarkable.

 

The month opened with its highest temperature of 18.2 °C but fell to 1.4 °C on the 19th.  Nevertheless this kept September frost-free for the fifth year in a row.

 

 

July/August 2017

 

July and August were most undistinguished, barely compensating for June's poor performance.  Despite there only being 10 rain-free days in July it was the driest of the last five years (39.6 mms) and the 9 rain-free days in August gave it a very average total of 65.2 mms. All this yielded an updated cumulative annual total still comparable with that of previous years.

 

Despite appearing to be rather dull overall, both months were pretty much the same as last year in terms of sunshine.

 

Only 5 days in July topped 20 °C (a maximum of 23.2 °C on the 24th and a minimum of 6.1 °C on the 21st) while only 1 day reached those heights in August (a maximum of 20.5 °C on the 26th and a minimum of 5.7 °C on the 6th).

 

Remember, September needs no more than 41 mms in order to grab the "5-yr-average driest month" title!

 

 

 

June 2017

June was a (not very pleasant) surprise.  Only 3 days in the middle of the month teetered above 20 °C (a maximum of 21.1 °C on the 17th and a minimum of 4.1 °C on the 3rd).

 

More significant, however, was the rainfall.  With a total of 96.0 mms, this June was the wettest in our 5-year record and amazingly was our wettest month since the 250 mms deluge of January 2016!   Nonetheless, after the dry start to the year this has had the effect of returning the cumulative annual total to a value comparable with that of previous years. 

 

To rub salt into our wounds, June in 2015 and 2016 had both produced record sunny days, but this year June 29th was notable only for being the dullest day since March 10th.

 

 

May 2017

 

May was a pleasant month with no additional frosty nights (minimum of 0.3 °C on the 6th)).  A warm spell towards the end of the month saw four consecutive days breach the 20 °C barrier - always a treat! - with a high of 25.2 °C on the 25th

 

The month took a while to get going with rain but its eventual total of 38.4 mms was unremarkable, mostly occurring in the latter two weeks.

 

Friday May 5th joined a very select band of totally cloudless days noted since recordings began.  Given that March and May seem to be the favoured months maybe we can't expect another one this year!

 

 

 

 

April 2017

A record-breaking month!   Although it saw two additional frosty nights (a particularly unkind one of -3.1 °C on the 18th) the main feature of April 2017 was the lack of precipitation.  A couple of days of sleety snow could only help the total stagger to a record low of 8.0 mms - smashing the previous record of 14.2 mms accumulated in September 2014.

 

The monthly precipitation figures and averages can be seen in a new plot.  Interestingly, September still features as the driest month and it would take more than 41 mms of rain this September to allow April to undertake it on the full five-year average.  Watch this space!

 

The two frosts on the 18th and 25th still leave the overall winter looking mild, much like 2014, although beware complacency as in two of the last five years there have been frosts in May.

 

 

 

March 2017

Another pleasant if unspectacular month to round off (?) the winter.  It gave the impression of being quite dry (memories are short and most precipitation fell in the first 10 days), but actually the recorded rainfall of 58.2 mms was a little above average for March.

A maximum temperature of 16.3 °C was reached on the 25th only 3 days after the minimum of -3.3 °C on the 22nd

There were only 5 frosty nights, which if April plays ball would give a record few frosts in the season. (The number of April frosts ranges from 2 in 2014 to 10 in 2012). The average temperature of 5.76 °C was very respectable and the second highest on record.  Our recorded March average temperatures range from 1.9 °C in 2013 to 7.0 °C in 2012.

 

February 2017

A benign month as far as Februarys go. The recorded precipitation of 92.2 mms came mostly in the first and fourth weeks and put the annual total on a par with some previous years (notice the alternation). 

A pleasant maximum temperature of 12.6 °C was reached on the 20th.  There were only 6 frosty nights with a minimum temperature of -3.4 °C occurring on the 28th.  Not surprisingly, therefore, the average temperature of 4.39 °C was significantly warmer than previous years (2013-2016 averages were 1.67, 3.34, 2.6, 2.2 °C respectively).

 

January 2017

Following a relatively dry December, last month gave a whole new meaning to dry-January!  The miserly rain total of 28.6 mms (cf last year's 251.2 mms) would have been even more impressive had it not been for a couple of days at the end of the month which contributed 10.8 mms of that total. 

 

The sequence of wet Januarys/Decembers noted last month did therefore continue, which doesn't bode well for December this year. In which case with his renowned drain management skills, let's hope Rob doesn't relocate anywhere near to here (Archers reference, obviously!).

Despite the seemingly cool, dry weather the average temperature was still half a degree warmer than last year's soggy effort.  So much for a cool/dry, warm/wet dichotomy.  There were 9 frosty nights with a minimum of -4.2 °C reached on the 30th.

 

 

December 2016

Following a dry November, December proved a mild and also relatively dry month with only a brief flurry of activity as storms Barbara and Conor flew past either side of Christmas (giving a monthly total of 45.8 mms).  Only two frosty nights were recorded and the maximum of 14.2 °C on the 7th even marginally exceeded November's best effort.  The average monthly temperature of 5.4 °C was a significant change from last year's 2.2 °C.  The annual total rainfall progression had no sting in the tail and ended quietly in mid-field.

 

2016 is the the fourth complete year of data (temperature, sun and rain) taken with the met station.  The multi-year plots for rain show an interesting feature with January and December alternating as the wettest months.  We predict that Jan/Dec 2017 will either continue or break this sequence!

 

More seriously we perhaps should remember the 1st June 2016.  Numerically it came very close to being the sunniest day so far in our records.  However, the numerical record holder (10th June, 2015) holds that honour by virtue of the swimming pool effect noted back in August whereas 1st June was clear from dawn to dusk and so purely on aesthetic grounds we have entered it as joint record holder in our honours table below!

 

 

November 2016

A drizzly first half to November failed to accumulate much rainfall (monthly total 32.4 mms), but a cold snap in the second half sent temperatures plunging (media-like, post-truth hyperbole!).  The minimum of -6.6 °C was hit at around 08:00 on the 21st after we had sweltered to a maximum of 14.1 °C on the 14th

 

The overall result was that the average temperature came out at 3.4 °C - the lowest in 5 years. Not a good sign maybe given that the next coolest November (at 3.6 °C) was in 2013 and that continued on a downward trend.

 

The annual total rainfall progression dipped a little with the result that, barring a deluge in the next couple of weeks, 2014's record total seems safe.

 

The cold snap from the 18th to the 26th gave a total of 10 frost days/nights - not unusual for November.

 

 

October 2016

A very pleasant October by all accounts.  It was mild, fairly dry and unusually calm, which allowed the changing leaves to remain in splendour on the trees.  Funny how general perceptions can sometimes be swayed by a few days, which indeed did have those characteristics. The monthly statistics suggest that this October was not particularly noteworthy.

 

 

 

October statistics (°C, mms, km/h)
Year Average Temperature Total Rain Average Wind
2016
8.62 61 7.1
2015 8.82 51 6.1
2014 8.81 108 8.4
2013 8.75 117 7.8
2012 5.60 91 4.6

 

It was mild, but not as mild as the previous three years. It was dry, but not as dry as last year and there were no gales, but it was windier than the average of the previous four years!

 

The total rainfall for the year continues on a steady progression after the rush at the start of the year.

The first frost of the season (-0.8°C) was recorded on the night of the 25th which gave a frost-free season of 178 days (from April 30th).  The statistics of the last five seasons formally suggest a lengthening of the frost-free season by 9.5 days per year - clear evidence of local, if not global, warming - statistics eh?!

 

September 2016

 

A rather colourless September with steady if not staid precipitation recordings.  As in August, five days topped 20°C.  A maximum temperature of 21.9°C was reached on the Tuesday 6th and a minimum of 4.4°C in the early hours of the 26th

The average temperature of 13.2°C was only marginally cooler than August's 13.7°C.

 

As expected, answers poured in to the question posed in August (solar radiation data on the 17th).  A clue was to note that after midday (solar time) the sky was clear with uninterrupted sunshine.  The puzzle was that at times during the partially cloudy morning the radiation levels recorded far exceeded the expected values based on the assumption that radiation levels would be approximately symmetrical around noon. 

 

It is a phenomenon that occurs quite frequently in our records though it is not always obvious in the absence of the "clear sky reference" on the same day.  How can that be?!

 

When I first noted this effect not long after the met station was installed I asked around for possible explanations.  Those asked included online weather-nerd forums, personal weather-related contacts and even the official MetOffice helpline.  They were all in accord that it was not a real effect and must be caused by an instrumental problem or external effects like reflection from a nearby building or passing vehicles.  This was puzzling (and frustrating) since several online amateur and professional websites with solar radiation recording equipment showed exactly the same phenomenon!

 

In the end I came across a couple of obscure reports which did mention the effect and as a result managed to exchange emails with a retired college professor in California.  He confirmed the reality of the effect and also noted that it was strange so few people "in the business" knew of it or believed it was real.

 

The (or at least for now, a possible) explanation is that the bright edges of broken clouds can focus sunlight (that's why they look bright!) into small, bright, moving patches on the Earth's surface and when these bright patches pass over a detector the recorded brightness can be in excess of the clear-day value.  

 

I like to think of it as similar to the bright ripples seen on the floor of swimming pools. Those are caused by the focussing effects of waves on the water surface, but you can imagine that a single light detector on the pool floor would keep seeing peaks in intensity as these brightness concentrations pass over it.   If we could look at the Earth from above - limited by the clouds causing the effect! -  or have enough ground-based detectors to cover a large area we might see the same two-dimensional, cloud-caused brightness ripples on the Earth's surface.

 

That's the story so far at least - unless anyone knows better.....

 

As for the prizes offered last month - let's say everyone gets an honourable mention though why nice Kim Jong-il's reputation should be so impugned I don't know!

 

August 2016

 

A pleasant August - the driest of the last three - and the warmest of the last five.  Five days topped 20°C (a maximum of 22.4°C was reached on the 16th after having dipped to 2.6°C overnight on the 10th). 

 

The average temperature of 13.66°C just beat the previous four years (2012-15 August averages were 13.25, 13.61, 11.71, 12.71°C respectively).

 

There were no perfectly clear days although the solar radiation data on the 17th show an interesting phenomenon.  A glass of wine to anyone noting what the phenomenon in question was and a bottle to the first person to send an explanation!  That'll test whether anyone ever reads this stuff!

 

 

June/July 2016

 

Apologies - June's details were delayed so you get two months for the price of one this time.

 

June was soggy (80.4 mms) compared to the last few years.  The first week was glorious but it drizzled/showered out after that.  A peak temperature of 22.7 °C was reached on the 6th June having previously dipped to 4.9 °C on the 2nd.

 

Going by the sunlight records, the 1st was notable as being only the second totally cloud-free day of the year (cf March 19th mentioned in dispatches below) and therefore by far (well, just pipping May 31st) the sunniest day of the year.

 

The plot for the 7th June is interesting.  After a relatively bright morning, it shows the arrival and sudden onset of a thunderstorm.  Just after midday the light had dropped to, and remained for a while at, the level expected of about 8pm on a clear day and the light level at 3:30 in the afternoon plummeted to that expected at 9:30 pm.  Not sure if the hens roosted early, but they were probably thinking about it!  

 

July was nearer the average for rainfall (61.8 mms) and having hit a low of 4.4 °C, also on the 2nd, redeemed itself a little with a balmy 25.3°C on the 19th - this year's peak so far.

 

 

 

May 2016

There were only 28.2 mms of rain which made it a relatively dry May. 

 

No late frosts were recorded though a flirtation was made on the 14th when the minimum dropped to 0.4 °C after a high of 21.6 °C was reached on the 11th.

 

The average temperature crept up significantly from April's' 5.6 °C to 10.7 °C helped by a run of 5 days topping 20 °C in the second week of the month

 

 

 

 

April 2016

 

There were 41.2 mms of rain which puts it on a par with April in previous years, but it included a very dry spell from the 10-28th

 

 Only 4 frosts were recorded making it (barring any late surprises) a relatively mild winter season.  The average temperature crept up from March's 4.8 °C to 5.6 °C. 

 

A maximum of 16.7 °C was reached on the 20th, but then came a low of -2.4 °C late in the month on the 28th - a late but not at all unusually late frost.

 

 

 

 

March 2016

Nothing very extreme or too exciting in March this year. The temperature dipped to -2.2 °C on the night of the 10/11th and peaked at 12.5 °C shortly afterwards on the 14th.  Overall temperatures were unexceptional with an average of 4.8 °C.  Previous years had been 2013: 1.91 °C, 2014: 5.03 °C and 2015: 3.95 °C.  An average number of frosts was recorded. 

There were 51.2 mms of rain and 9% more solar energy than last March.  However, we were bathed in over twice as much solar energy as in February so spring has definitely sprung and apparently the first cloudless day of the year occurred on the 19th.

 

January 2016

A torrential start to the year saw January produce 251.2 mms of rain.  On the final day it just eased past January 2014 to take the "wettest month" record. 

The temperature dipped to -4.6 °C at 6 am on the 9th, but peaked at 12.8 °C at 4 am on the 25th!  Overall temperatures were unexceptional with a reasonable number of frosts. 

A windy period at the end of the month saw a peak gust of 85.3 km/h on the 29th.

Despite the increase in daylight hours, if there are still any still local weather doldrums (of the psychological kind) it might be worth noting some 2015 weather statistics I came across in the Killin community paper (courtesy Anderson Dentistry).

   Rain (year)     Rain (December)  Frosts 
Tulliemet  889 mms 206 mms 51
Killin 2479 mms 542 mms ?
Tyndrum 3586 mms 738 mms 73

What a relatively warm/dry climate we live in! At least we all agree on the warmest day of the year - July 1st.

 

 

December 2015

A soggy end to the year saw December produce 206 mms of rain, second only to January 2014 in our records.  UK-wide it was a record-breaking month for temperatures.  The Tulliemet average was 5.42 °C compared to 2.20 °C in 2014 and 4.56 °C in 2013.  Note that this year's high figure even includes the nearly 32-hour period around the 13th which had continuously sub-zero temperatures.

While the annual differences may sound small, as averages they are significant (cf. the numbers touted in climate change discussions) as evidenced by the paucity of frosts. 

November 2015

 

Compared to 2013's precipitation and average temperature  (48 mms, 3.6°C), this November was almost a rerun of 2014 with 97 mms (2014:124mms) and 5.8°C (2014: 6.4°C) though it was 12% sunnier than last year - so few surprises.  If anything counts as a surprise it was the maximum temperature of 14.2°C which was reached around midnight on 9th/10th !

There were only two frosts and the competition for cumulative rainfall will obviously go to the wire.

 

October 2015

As you can see from the monthly plots, normal service of temperature and humidity recording was resumed on the 3rd.

Overall October was very pleasant with only one frost on the 16th and it was 17% sunnier than last October.

With only 4 days of significant rainfall the monthly total was 51.0 mms and the cumulative rainfall remains unexceptional. 

The average temperature of 8.82 °C compares favourably with the 2013 value of 8.74 °C and last year's 8.81 °C.  The corresponding values for November 2013 and 2014 were 3.63 °C and 6.41 °C.   Any country folklore-type predictions for this year?

 

September 2015

September was fairly dry (34.4 mms and 17 precipitation-free days), evenly temperatured (only two days peaked significantly above 15 °C) and calm (from the 13th onwards the windspeed averaged only 4.0 km/h).  The cumulative rainfall total remains unexceptional.

 

On the other hand (and jumping the gun a little) Thursday 1st October was noteworthy.  It was the first day of the year without any atmospheric interruption to the solar radiation record (sunny all day in other words!).  Only two days in 2015 had come close to competing with that, but each had spoilt their record occasionally during the day.  Note the spike caused by the anemometer pole shadow and note how its timing changes on those three days (February is an hour displaced as the weather station software takes note of daylight savings time for some reason).  The shadow timings for those three dates are actually quite close.  The expected overall variation during the year from July (11:35) to December (10:40) is nearly an hour.

 

The eagle-eyed amongst you will have noticed the truncation of September's temperature record.  The temperature/humidity sensor died around 16:50 on the 28th September. Thanks to the generosity of the station's sponsors we hope to install a replacement asap!

 

 

August 2015

On the whole a pretty average August.  Overall it was slightly sunnier than last year, but the temperature only just peaked above 20 °C on two occasions (13th and 17th).  The 17th saw both the highest day (20.4 °C) and lowest night (4.3 °C) temperatures.

With only 9 dry days, the cumulative rainfall total remains unexceptional.

 

July 2015

A woeful July on the weather front saw a total of 108 mms of rain (double the long-term average according to the media headlines with only 6 completely dry days), an average temperature 2.6°C lower than last year (3.4°C lower than 2013) and a poor showing with sunshine (2014 and 2013 were 25% and 28% brighter in that respect).

However, the cumulative rainfall total finally broke away from under 2013's (rain?) shadow!

Recent (2013) days of note:

5th December - record wind gust and no electricity for a few hours!

11th October - first frost.

9th/10th October - a windy night with record-breaking gusts that brought a couple of major branches down on the driveway.

23rd/24th July - Thunderstorms, power cut and by far the warmest night of the year.

19th July - With unbroken sunshine, the temperature approaching 25 °C, low humidity and a gentle southerly breeze was there ever a more perfect day than this?

17/18th July - warmest night on record

12/13th July - but it came back and just managed another 2 records - see above

9th July - record high temperature of 26.2 °C, but summer didn't last!

8th June - the warmest day of the year (in fact the warmest since August 18th last year) reached the giddy heights of 20.4°C before showers arrived and the temperature plunged an amazing 7°C in 90 mins. 

25th May was the first truly cloudless day of the year (plotted in red), although the 19th and 27th of February both came admirably close. 

30th April saw the last frost (barring surprises) of the winter, which came briefly around 06:15 this morning.  Prior to that the 9th April had the last frost - shame really as the 9th would have been a very early (record?) last frost.  However, the temperature did dip perilously close to zero (0.4°C) early on the 25th May - yes the same 25th May!

 

General plots:

Rain from March 2012 to ....  Temperature from March 2012 to ....

Compare the temperature of  March 2012 to March 2013.

 


1 For easier comparison, the temperature and solar energy are plotted on scales which should cover values throughout the year.

 

Old news:  March 2013

March is firmly in the record books - at least for the record low avergae temperature. One period of note is the nearly 4-day continuously-below-zero period from 15:40 on 21st March to 10:15 on the 25th March (compared to the nearly 14-day period of below-one-degree in January!) 

18th January 2013

Follow near realtime2 conditions at the new Tulliemet Weather display.

2 - well, within a minute or so. The page can be manually updated or will automatically refresh every 5 mins or so. The rainfall figure is that detected since midnight and the 'seasonal total' rainfall is that recorded in this calendar year.

Old news:  1st January 2013

2012 went out with a bang which took it off bottom spot for annual totals. The week of 17th December produced 127 mms, which is not only nearly half as much again as the previous wettest week in the last 6 years, but represents a staggering 14% of this year's annual total. The weekly averages over 6 years begin to suggest the best times to be here, or elsewhere!

The daily min & max temperatures recorded since the met station was installed in March are shown here and illustrate nicely the unusually warm spells in late March and May.  Unfortunately they were destined not to be repeated during the rest of 2012. 


Old news: 8th November 2012

As predicted, a decent rainfall on 11th & 12th October, but since then fairly dry and cool - maximum temperature not reaching 10°C from 25th Oct until 6th Nov.  This year continues to be the driest since 2007.


Old news: 11th Oct 2012

After 3 frosts this week (min -2°C), heavy rain is forecast for tonight and tomorrow, which should break the recent 7-week dry spell.  To date, 2012 has become the driest on record.  This year's weekly breakdown is available here, and the plot of the weekly average over all years is here.


Old news: 22nd Sept 2012

Last night's minimum of -1.6°C was the first frost of the autumn, the first frost since May16th and the coldest night since April 29th.  Happy equinox - at 15:49 BST today!


Real-time weather data is now available from the  Davis Vantage Pro2 weather station in Tulliemet.

Follow this link to see the rainfall data gathered (manually) since 2007, or check out the Met Office's new WOW pages to see what other weather enthusiasts are reporting.