Temperature Record Monitor Thread

[SnowBear]

I think I'll just wait for the official announcements by the MetOffice once they have verified the values they receive. 

[Mapantz]

The Met Office extremes has changed, it ditched the 39.9 at Scampton, and changed it to Coningsby 40.3

 

[ShinyDave]

Just now, Mapantz said:

The Met Office extremes has changed, it ditched the 39.9 at Scampton, and changed it to Coningsby 40.3

 

Does suggest the 39.9 was, as suspected, an automated ceiling of some kind. (The existence of which would be telling itself - 40C was meant to be an error, and is now a real number that can really happen.)

[hillbilly]

4 hours ago, Jo Farrow said:

With so many records falling and this major step of passing 40C in the UK, I'd imagine for now, the MO might as well

just take time to gather all the incoming info (from the 09Z climate sites  for yesterday) and QC all the data before a major announcement of

the final quality data that has been checked. Rather than a dribs and drabs effort and definitely without any backtracking that certain groups will leap on.

This isn't just national records falling, it will feed into serious climate and political messaging.

For me yesterday albeit extremely exciting i am hoping that this is not the norm to come.Is it possible that what we witnessed just happened to be everything lined up to give such high readings.Certainly it has taken 30 years to breach many of the records and yesterday could well be that day most of us will never remotely witness again in our lifetimes.Also am i right in thinking that 1976 still holds some records certainly for many days at high temps albeit not the 2 day freaks we have just witnessed.

[Athens Heat]

1 hour ago, Mapantz said:

A lot of fixation on Davis stations, but they can still be inaccurate with fan aspiration. There's been extensive discussion on another forum over the years, that most people installing fans can actually cause larger discrepancies. They don't have adequate places to have their stations. Fans then blow air over the sensor that has been warmed by fences, sheds, patios, walls, and other man-made objects, causing the temperature sensors to overread.

If you properly maintain and calibrate a Davis fan aspirated station while following the installment guidelines then readings from such stations are virtually the most accurate from all known met stations. Even if installed in the most urban environments then you would get extremely reliable data. Various met offices (I remember a few papers from Japanese and Korean met offices) that suggest fan aspirated stations in urban environments are probably the most useful tools for determining reliable weather observations in the places where people actually live.

Edited July 20, 2022 by Athens Heat

[Mapantz]

2 minutes ago, Athens Heat said:

such stations are virtually the most accurate from all known met stations.

If you think Davis temperature sensors are the most accurate, you're very misguided.

[Athens Heat]

1 minute ago, Mapantz said:

If you think Davis temperature sensors are the most accurate, you're very misguided.

I do think fan aspirated ones are the most accurate or among the most accurate in the world, surpassing Stevenson Screen accuracy when frequently maintained and properly calibrated. 

[A Face like Thunder]

10 minutes ago, hillbilly said:

For me yesterday albeit extremely exciting i am hoping that this is not the norm to come.Is it possible that what we witnessed just happened to be everything lined up to give such high readings.Certainly it has taken 30 years to breach many of the records and yesterday could well be that day most of us will never remotely witness again in our lifetimes.Also am i right in thinking that 1976 still holds some records certainly for many days at high temps albeit not the 2 day freaks we have just witnessed.

According to Philip Eden, there were fifteen consecutive days in June 1976, starting on 23rd, when the temperature passed 32C somewhere in England, and on five of those days, the mercury passed 35C. I imagine that's a record which still holds and will do so for some time to come.  

[B87]

3 minutes ago, A Face like Thunder said:

According to Philip Eden, there were fifteen consecutive days in June 1976, starting on 23rd, when the temperature passed 32C somewhere in England, and on five of those days, the mercury passed 35C. I imagine that's a record which still holds and will do so for some time to come.  

London had 16 consecutive days at or above 31c during that spell. I don't think that will be broken for some time yet. 

[Methuselah]

9 minutes ago, A Face like Thunder said:

According to Philip Eden, there were fifteen consecutive days in June 1976, starting on 23rd, when the temperature passed 32C somewhere in England, and on five of those days, the mercury passed 35C. I imagine that's a record which still holds and will do so for some time to come.  

I agree, it won't be beaten for many years (I hope!) to come. However, considering how the last few summers have panned out, there's a new question: Will four days exceeding 100F, in as many summers, ever be bettered? And, if so, when?

[SnowBear]

26 minutes ago, Athens Heat said:

I do think fan aspirated ones are the most accurate or among the most accurate in the world, surpassing Stevenson Screen accuracy when frequently maintained and properly calibrated. 

Beginning to wonder if you work for or have shares in Davis!

[danm]

38 minutes ago, hillbilly said:

For me yesterday albeit extremely exciting i am hoping that this is not the norm to come.Is it possible that what we witnessed just happened to be everything lined up to give such high readings.Certainly it has taken 30 years to breach many of the records and yesterday could well be that day most of us will never remotely witness again in our lifetimes.Also am i right in thinking that 1976 still holds some records certainly for many days at high temps albeit not the 2 day freaks we have just witnessed.

 

24 minutes ago, A Face like Thunder said:

According to Philip Eden, there were fifteen consecutive days in June 1976, starting on 23rd, when the temperature passed 32C somewhere in England, and on five of those days, the mercury passed 35C. I imagine that's a record which still holds and will do so for some time to come.  

1976 was exceptional, and still hasn't been beaten in terms of the longevity of the heat, but it seems to be a bit of an anomaly compared to most summers during that time period. 

What has become increasingly common, at least in the S/SE, are days when temperatures hit or exceed 35°c. Here in London we've hit 35°c or above in 2015, 2018, 2019, 2020 and 2022. That's 5 out of the last 8 summers. 3 of those have exceeded 37°c. 

The last time we hit or exceeded 35°c prior to 2015 was 2006. The last time before that was 2003. The last time before that was 1990. The last time before that was 1976. You get my drift. 

We also seem to be getting more and more spells where multiple consecutive days hit 30°c or above. 

Edited July 20, 2022 by danm

[The PIT]

1 hour ago, Mapantz said:

If you think Davis temperature sensors are the most accurate, you're very misguided.

Davis think so that's why they have removed a lot of calibration options from weatherlink live. However I agree with you they do need calibration. Once done they are pretty consistent although ever so often you get an odd reading like being 3 degrees lower than the Stevenson screen next to it then it goes back to almost matching it perfectly.

[Athens Heat]

1 hour ago, SnowBear said:

Beginning to wonder if you work for or have shares in Davis!

Oh come on 

[Roger J Smith]

If you're interested in seeing how the 2022 heat wave did against the CET records, I have a list of those in the CET contest thread. Basically the last two days both broke the all-time max (34.8 then 37.3) and now sit 1-2 on the top 40 list (going back to 1878 although the first year to make an appearance on the list was 1906). The daily means were broken on both 18th (24.4) and 19th (28.1), the second time becoming the new all-time record high mean. The minimum for 19th was the second highest in the data set. 

[emmett garland]

1 hour ago, Roger J Smith said:

If you're interested in seeing how the 2022 heat wave did against the CET records, I have a list of those in the CET contest thread. Basically the last two days both broke the all-time max (34.8 then 37.3) and now sit 1-2 on the top 40 list (going back to 1878 although the first year to make an appearance on the list was 1906). The daily means were broken on both 18th (24.4) and 19th (28.1), the second time becoming the new all-time record high mean. The minimum for 19th was the second highest in the data set. 

Irelands all time record in Kilkenny was in 1887 what was the daily C E T in UK if possible and was there any records that day

Just now, emmett garland said:

Irelands all time record in Kilkenny was in 1887 what was the daily C E T in UK if possible and was there any records that day 33.3 degrees max temp

 

[Roger J Smith]

The June 1887 spell was not that remarkable on the CET, Emmett, here are the numbers for 21st to 30th:

Date ____ Max 

21 ______ 21.2

22 ______ 21.6

23 ______ 23.6

24 ______ 20.5

25 ______ 21.7

26 ______ 18.9

27 ______ 25.9

28 ______ 21.9

29 ______ 22.7

30 ______ 22.8

[Roger J Smith]

This recent hot spell reminds me of the impact made by the 1936 heat wave on eastern North American records. At Toronto (records started in 1840) the highest maximum before the 1936 heat wave had been in July 1911 (103F), this was replaced by three consecutive days of 105F readings (8th to 10th July 1936). At New York City (records from 1869) the highest had been in August 1918 (104F) and that was replaced by 106F on 9th July 1936. Interesting to note the 1936 peaks have never been broken since, Toronto has never been higher than 101F (in 1948 and 2011) and NYC 104F (in 1977 and 2011). 

So while there may be a human element in this recent hot spell, the natural climate can do similar things and there's no guarantee these latest records in the UK would be broken over a short period of time. 

Much like this recent hot spell, the 1936 heat wave relied on a convergence of all possible "go" factors for heat, like a superheated source region, a very high upper atmosphere support package, and dry ground previously warmed by sunshine. As impressive as it looks for Toronto and NYC, some places saw even larger departures from previous record highs in 1936 and the margin retained to the present time is greater also. 

Returning to the CET aspect, the highest maximum in the CET from 1878 to 1905 was only 29.4, then 1906 increased it to 31.2. From there the next increase was not until 1948 (31.5) then 1975 (31.9) with 1976 quickly adding to that (33.1). After 1976 the only increases in the absolute maximum were in August 1990 and the Monday-Tuesday of this past week. 

Think it might be worth copying the file posted in the contest thread to show the top 40 CET maxima, note what is added about years from 1772 to 1877 when maxima are not available ... there were probably some very hot days in that era too. While not in high summer, the warmth records from late April 1775 may be just as significant as this heat wave has been (several degrees above the records on either side of them but we don't know the maxima for those, just the means). 

The new top forty CET maxima (v2.0) _ bold were highest to date

 1. 37.3 __ 19 July 2022

 2. 34.8 __ 18 July 2022 

 3. 34.2 __ 25 July 2019

 4. 33.4 ___ 3 Aug 1990

 5. 33.2 __ 31 July 2020

 6. 33.1 ___ 3 July 1976

 7. 33.0 __ 19 July 2006

t8 32.8 ___ 2 Aug 1990

t8 32.8 ___ 9 Aug 2003

t8 32.8 ___ 1 July 2015

11. 32.0 __ 12 Aug 2020

t12 31.9 ___ 4 Aug 1975

t12 31.9 ___ 1 Aug 1995

14. 31.7 ___ 2 July 1976

15. 31.6 ___ 6 July 1976

t16 31.5 __ 29 July 1948

t16 31.5 ___ 2 Aug 1995

t18 31.3 ___ 4 and 5 July 1976

20. 31.2 __ 31 Aug 1906

t21 31.1 ___ 1 Sep 1906

t21 31.1 ___ 7 and 8 Aug 1975

24. 31.0 __ 12 July 1923 

t25 30.9 ___ 9 Aug 1911

t25 30.9 __ 31 July 1943

t25 30.9 __ 13 July 2003

t25 30.9 __ 18 July 2006

t25 30.9 __ 19 July 2016

t30 30.8 __ 28 July 1948

t30 30.8 __ 26 July 2018

32. 30.7 __ 11 Aug 2020

33. 30.6 __ 13 July 1923

t34 30.5 __ 13 Aug 1911

t34 30.5 __ 27 Aug 1930

t34 30.5 __ 30 July 1948

t34 30.5 __ 10 Aug 1997

t38 30.4 1 July 1976, 31 July 1995, 3 Aug 1995 and 29 June 2019

(note before 1906 the highest value was 29.4 on 26 June 1878 tied 19,20 July 1901, although it may have been higher before daily maxima report era)

______________________________________

While there are no maxima for 1772 to 1877, there are probably around 10-15 days that might have made this list from their daily record high means. Those are mostly in these years: 1808, 1825, 1826, 1834, 1852. One or two might have been "top ten" values. 

The minimum of 18.9 for 19th July 2022 is the second highest value on record. The highest was 19.5 on 20th July 2016. The previous second highest was 18.8 on 11th August 1997, followed by 18.7 on 29th July, 1948. 

Edited July 21, 2022 by Roger J Smith

[Kirkcaldy Weather]

 

[mushymanrob]

CET wise this August upto the 21st has a CET of 19.3, which makes this August the hottest on record (so far) beating 1995 by .1c

 

[Alexis]

Interesting graphic

 

Edited August 23, 2022 by Alexis