Interesting stat for today - can you beat it?

[Dave C]

I was thinking about same day date differences in maximum temperatures. Max here was 20.6C today and 38.5C on Aug 10th 2003. So a difference of 17.9C in max for that date. I suspect there have been lower Aug 10th maxima so that differential could be larger still for August 10th. I wonder if it has been beaten on a different day? (Maybe a day in March?)

Dave

[Brian Wakem]

I've only been keeping proper records for 3 years so I can't get anywhere near that.

Top 10:

Diff

13.8    2016-07-01      18.4    2015-07-01      32.2

13.1    2015-07-24      15.0    2014-07-24      28.1

12.8    2016-04-15      11.2    2015-04-15      24.0

11.9    2014-03-16      18.2    2015-03-16       6.3

11.8    2015-03-15       5.4    2014-03-15      17.2

11.2    2014-07-26      27.4    2015-07-26      16.2

11.1    2013-09-05      26.6    2015-09-05      15.5

11.0    2016-04-16       7.7    2015-04-16      18.7

11.0    2014-05-08      14.2    2016-05-08      25.2

10.8    2014-05-19      24.7    2015-05-19      13.9

-- 

Brian Wakem

Lower Bourne, Farnham, Surrey

http://www.brianwakem.co.uk/weather

Live obs @ 09:45:14 : 16.1C, DP 13.2C, RH 83%, 0.0 mm

[xmetman]

I'm afraid that I can trump most of the daily extremes so far, but only because I have a daily temperature series that started in 1878.

Here are the largest daily ranges in the Central England Temperature series since 1878:-

I can't identify the years that the extremes occurred in, but I'll rework the code to save and display the year they occurred in version 2, here's the graph:-

[Brian Wakem]

Bruce - that's not right.  We were talking about the difference between maxes on the same say in different years, not the difference between a min and a max in different years.

-- 

Brian Wakem

Lower Bourne, Farnham, Surrey

http://www.brianwakem.co.uk/weather

Live obs @ 12:17:49 : 19.2C, DP 13.2C, RH 68%, 0.0 mm

[xmetman]

Oh I see the range of maximum temperatures through the year. 

I already have the extremes, so the graph was easy enough to regenerate, but the range is considerably smaller as you would expect from a composite temperature, and a lot more seasonal than the extreme range was.

[Richard Dixon]

Bruce - both your graphs have statistically shown to me how generally drab late October / November is - can't get too cold, too late for an Indian summer and this diurnal ranges and extremes are - well - all a bit unremarkable!

Richard

[George in Edinburgh]

From my Epping records 1979-2013

Jan 15th max range 20.0degC with -8.0C on 15/1/87 and +12.0C 0n 15/1/94

March 20th range 21.0degC with +3.3C on 20/3/2001 and +21.0C on 20/3/90

May 27th range 22.1degC with +10.0C on 27/5/84(and 1994)  and +32.1C 27/5/2005

but the winner is

August 10th with a range of 22.9degC, +15.0 on 10/8/1981 and 37.9C 0n 10/8/2003

[Trevor Harley]

In 2003 the daily range at Altnaharra on Good Friday, the 18 April, was 28.2C (from 24.5C maximum to -3.7C minimum the next night).

A low of -7.0C on the 9th, at Tummel Bridge, near Pitlochry; yet in the afternoon it was 22.0C, a range of 29.0C, the highest temperature range recorded in Britain.

I think.

In England I have a memory that the good old frost hollow of Rickmansworth generated some large daily ranges.

Trevor

http://www.trevorharley.com/trevorharley/weather_web_pages/britweather.htm

[Dave C]

Thanks George - I was thinking there must be a relatively low August 10th around here at some point. 

And thanks for the other interesting data that has been generated. 

[George in Edinburgh]

..and just look at that Essex  maximum of -8.0C Dave. Not sure that we'll see the like of that again-for at least a number of reasons . Almost 30 years ago it was. As said elsewhere on this thread my money would be on a Highland glen in late spring.

[John Hall]

Belated thanks, Bruce. One thought. Because the CET values are the means from, I think, three stations, the extreme ranges are likely be depressed a little from what you might find when looking at the individual stations.

[xmetman]

Yes, you are correct that's the problem with a composite temperature.