Eric Huxter

[Eric Huxter @EricHuxter]

#Weatheraware

25/06/2026 Merryfield (CIMO 4) m Est. 2021(PRT Era) recorded 36.7°C at 14:30 GMT
1.0°C above Previous hour
10.9% probability at a CIMO 1 site
61.1% of Minimum Assumed Ventilation

Since 26/04/2025 Merryfield 6 days
Mean spike 1.1°C
9.1% Probability
35.3%MAV

[Eric Huxter @EricHuxter]

OTD
1959 Conham Noteworthy 94.2mm Rainday (33.6% Record 279mm 18/07/1955,Martinstown)
1980 Sevenoaks Very Rare 116.2mm 105mins
2007 Winestead
Noteworthy 81.2mm Rainday (29%)
Noteworthy 121.2mm 2 days(29.9% Record 405mm 05/12/2015,Thirlmere)

[Eric Huxter @EricHuxter]

#Weatheraware

25th June UK Max Rainfall
2026 29mm S Uist Range
29mm in 24hours is 10.4% Record Rainday 279mm 18/07/1955 Martinstown
Recurrence 263 days

OTD
1880 Athlone VRare 78.2mm 75 mins
1883 Cambridge Noteworthy 25.2mm 40mins
1883 Newport Pagnell Remarkable 50.2mm 65mns

[Eric Huxter @EricHuxter]

OTD
1951 Glenferness Noteworthy 74.2mm Rainday (26.6% Record 279mm 18/07/1955,Martinstown)
1953 Langham Water Works Very Rare 53.2mm 35mins
1958 Foffany Reservoir Very Rare 108.2mm 2.33hrs
1959 Conham Very Rare 76.2mm 90mins(65.1% Record 117mm 08/08/1967,Dunsop Valley)

[Eric Huxter @EricHuxter]

The -2.8°C record set in 1918:
Global Temperature 1.47°C below 2025 in an ENSO Neutral year

In June 1918:
Global Temperature 1.27°C below June 2025
UK Temperature 3.3°C below June 2025
CET Temperature 3.7°C below June 2025
CO2 122.40ppm below June 2025

[Eric Huxter @EricHuxter]

#Weatheraware

25th June UK Min T
2026 6.8°C Kinbrace
1918 -2.8°C West Linton

Today's Minimum is 9.6°C above the Record set 108 years ago (6.4 Std Dev above Monthly Mean)

To date Minima average 13.2°C above Daily Records

Average age of Records is 76.4 +/- 36.9 years

[Eric Huxter @EricHuxter]

Merryfield (Est. 2021) is CIMO Class 4 (+/-2°C Additional Error)
3 Days since last CIMO 1/2 Reading

Maximum run:
CIMO 1/2 5 days
CIMO 3/4/5 52 days
Average interval between readings from CIMO 1/2 12.0 days #ClimateCrisis

[Eric Huxter @EricHuxter]

#Weatheraware

25th June UK Max T
2026 36.7°C Merryfield
1976 33.5°C East Bergholt (

Today's Maximum is 3.2°C above the Record set 50 years ago (2.6 Std Dev above Monthly Mean)

To date maxima average 6.3°C below Daily Records and 2.0°C above Regional Forecasts

[Eric Huxter @EricHuxter]

Merryfield (Est. 2021) is CIMO Class 4 (+/-2°C Additional Error)

Of 1495 Daily Maxima to Date from May 2022 88% set by Weather Stations CIMO Class 3/4/5 (Mean 2.6°C Additional Error)

ie each week <1 day accurate data #ClimateCrisis

Mean additional error to date 2026 2.4°C

[Eric Huxter @EricHuxter]

While 36.7°C at Merryfield is 0.3°C below Maximum UK Forecast it is 1.7°C above its Regional Forecast Maximum

Mean anomaly from Maximum UK Forecast is +2.0°C
Mean anomaly from Maximum Regional Forecast is +2.7°C

It is 3.3°C below the maximum Red Weather Warning

[Eric Huxter @EricHuxter]

36.7°C at Merryfield(CIMO Class 4) is within +/-0.5°C of Max UK Forecast

Of 176 Maximum readings to date:
4.0% within +/- 0.5°C of Max UK Forecast
93.8% >0.5°C above Max UK Forecast
2.3%<-0.5°C below Max UK Forecast

systematic bias #ClimateCrisis

[Eric Huxter @EricHuxter]

The 33.5°C record set 1976:
Global Temperature was 1.27°C<2025
ENSO Neutral year

In June 1976:
Global Temperature 1.1°C<June 2025
UK Temperature 0.3°C<June 2025
CET Temperature 0.1°C<June 2025
CO2 95.55ppm<June 2025

[Eric Huxter @EricHuxter]

Average age of Records is 62.1 +/- 44.1 years

24/06/2026 is Day 176

On Day 176 24/06/2020 it was 32.6°C in Heathrow

[Eric Huxter @EricHuxter]

Copilot's take:

The Met Office QC system selects the value that passes administrative checks, not the value that best matches the physical behaviour of a Class 1 site.

#Weatheraware

[Eric Huxter @EricHuxter]

#Weatheraware

Interesting the MO chose Merryfield (15 yrs old & CIMO 4) to be record holder
max hourly report 35.9 °C 15:00 GMT
36.7 °C is 0.8°C >maximum reading=15.71% probability at CIMO 1)

against Yeovilton (65 year old & CIMO 1)
max 36.8 °C 15:00 GMT & 15:30 GMT