Heathrow Weather Records (UKE00107650)
Record envelope, standing records and threshold days for Heathrow (UKE00107650), United Kingdom, with 68 years of record.
Key Facts for Heathrow
- Heathrow (UKE00107650) is a weather station in United Kingdom at 51.48 latitude and 0.45 longitude, 25 m (82 ft) above sea level.
- The station reports from 1959 to 2026, 68 years of record.
- 1,464 records set at Heathrow still stand.
- Records are tracked for tmax, tmin, prcp, snwd: an element needs 30 years of data to be eligible.
- Heathrow set a daily record high minimum temperature of 17.3 C (63.1 F) on 29 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: United Kingdom, 51.48 latitude, 0.45 longitude.
- Elevation: 25 m (82 ft).
- Period of record: 1959 to 2026, 68 years.
- Eligible elements: tmax, tmin, prcp, snwd.
Daily Record Envelope and 2026
23 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 15.4 C (59.7 F) | -13.2 C (8.2 F) | 11.6 C (52.9 F) | -5.9 C (21.4 F) |
| Feb | 20.1 C (68.2 F) | -9.6 C (14.7 F) | 15.5 C (59.9 F) | 0.5 C (32.9 F) |
| Mar | 23.8 C (74.8 F) | -7.4 C (18.7 F) | 19.1 C (66.4 F) | 0.5 C (32.9 F) |
| Apr | 28.5 C (83.3 F) | -3.1 C (26.4 F) | 26.1 C (79.0 F) | 2.1 C (35.8 F) |
| May | 35.0 C (95.0 F) | -0.9 C (30.4 F) | 35.0 C (95.0 F) | 2.5 C (36.5 F) |
| Jun | 36.7 C (98.1 F) | 1.5 C (34.7 F) | 36.4 C (97.5 F) | 8.7 C (47.7 F) |
| Jul | 40.2 C (104.4 F) | 5.8 C (42.4 F) | 35.0 C (95.0 F) | 12.0 C (53.6 F) |
| Aug | 37.9 C (100.2 F) | 5.7 C (42.3 F) | 37.7 C (99.9 F) | 10.7 C (51.3 F) |
| Sep | 33.0 C (91.4 F) | 2.4 C (36.3 F) | n/a | n/a |
| Oct | 28.3 C (82.9 F) | -2.5 C (27.5 F) | n/a | n/a |
| Nov | 18.5 C (65.3 F) | -7.0 C (19.4 F) | n/a | n/a |
| Dec | 16.6 C (61.9 F) | -11.8 C (10.8 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1960 | 21 |
| 1961 | 19 |
| 1962 | 41 |
| 1963 | 38 |
| 1964 | 27 |
| 1965 | 27 |
| 1966 | 23 |
| 1967 | 16 |
| 1968 | 18 |
| 1969 | 26 |
| 1970 | 13 |
| 1971 | 18 |
| 1972 | 19 |
| 1973 | 9 |
| 1974 | 22 |
| 1975 | 15 |
| 1976 | 22 |
| 1977 | 23 |
| 1978 | 25 |
| 1979 | 36 |
| 1980 | 28 |
| 1981 | 28 |
| 1982 | 14 |
| 1983 | 22 |
| 1984 | 8 |
| 1985 | 46 |
| 1986 | 31 |
| 1987 | 21 |
| 1988 | 9 |
| 1989 | 16 |
| 1990 | 28 |
| 1991 | 13 |
| 1992 | 11 |
| 1993 | 21 |
| 1994 | 22 |
| 1995 | 22 |
| 1996 | 21 |
| 1997 | 24 |
| 1998 | 21 |
| 1999 | 12 |
| 2000 | 15 |
| 2001 | 15 |
| 2002 | 11 |
| 2003 | 25 |
| 2004 | 17 |
| 2005 | 23 |
| 2006 | 28 |
| 2007 | 17 |
| 2008 | 14 |
| 2009 | 7 |
| 2010 | 24 |
| 2011 | 28 |
| 2012 | 17 |
| 2013 | 18 |
| 2014 | 9 |
| 2015 | 34 |
| 2016 | 18 |
| 2017 | 19 |
| 2018 | 24 |
| 2019 | 20 |
| 2020 | 27 |
| 2021 | 17 |
| 2022 | 29 |
| 2023 | 32 |
| 2024 | 22 |
| 2025 | 33 |
| 2026 | 45 |
All-Time Record Progression
6 new records| Date | Kind | Detail |
|---|---|---|
| 1990-08-02 | Record high maximum temperature | Record high maximum temperature 36.5 C (97.7 F) |
| 1992-05-29 | Record daily precipitation | Record daily precipitation 61.8 mm (2.4 in) |
| 2003-08-09 | Record high maximum temperature | Record high maximum temperature 37.9 C (100.2 F) |
| 2016-07-20 | Record high minimum temperature | Record high minimum temperature 22.3 C (72.1 F) |
| 2022-07-18 | Record high maximum temperature | Record high maximum temperature 40.2 C (104.4 F) |
| 2026-06-26 | Record high minimum temperature | Record high minimum temperature 22.6 C (72.7 F) |
Wettest Day of Each Month
May: 61.8 mm (2.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 24.3 mm (1.0 in) | 2 January 1986 |
| Feb | 31.2 mm (1.2 in) | 9 February 2009 |
| Mar | 29.9 mm (1.2 in) | 14 March 1964 |
| Apr | 28.9 mm (1.1 in) | 29 April 1991 |
| May | 61.8 mm (2.4 in) | 29 May 1992 |
| Jun | 52.5 mm (2.1 in) | 11 June 1970 |
| Jul | 53.7 mm (2.1 in) | 22 July 1967 |
| Aug | 57.0 mm (2.2 in) | 2 August 1969 |
| Sep | 45.8 mm (1.8 in) | 22 September 1992 |
| Oct | 59.4 mm (2.3 in) | 12 October 1993 |
| Nov | 34.4 mm (1.4 in) | 2 November 2022 |
| Dec | 35.6 mm (1.4 in) | 27 December 1979 |
Period of Record Coverage
1959 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1959 | 1 | 0% | No |
| 1960 | 362 | 99% | Yes |
| 1961 | 359 | 98% | Yes |
| 1962 | 356 | 98% | Yes |
| 1963 | 363 | 99% | Yes |
| 1964 | 354 | 97% | Yes |
| 1965 | 356 | 98% | Yes |
| 1966 | 358 | 98% | Yes |
| 1967 | 360 | 99% | Yes |
| 1968 | 356 | 97% | Yes |
| 1969 | 354 | 97% | Yes |
| 1970 | 362 | 99% | Yes |
| 1971 | 358 | 98% | Yes |
| 1972 | 360 | 98% | Yes |
| 1973 | 359 | 98% | Yes |
| 1974 | 361 | 99% | Yes |
| 1975 | 363 | 99% | Yes |
| 1976 | 363 | 99% | Yes |
| 1977 | 359 | 98% | Yes |
| 1978 | 358 | 98% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 360 | 98% | Yes |
| 1981 | 355 | 97% | Yes |
| 1982 | 356 | 98% | Yes |
| 1983 | 360 | 99% | Yes |
| 1984 | 362 | 99% | Yes |
| 1985 | 358 | 98% | Yes |
| 1986 | 360 | 99% | Yes |
| 1987 | 357 | 98% | Yes |
| 1988 | 363 | 99% | Yes |
| 1989 | 359 | 98% | Yes |
| 1990 | 362 | 99% | Yes |
| 1991 | 359 | 98% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 356 | 98% | Yes |
| 1994 | 357 | 98% | Yes |
| 1995 | 359 | 98% | Yes |
| 1996 | 360 | 98% | Yes |
| 1997 | 358 | 98% | Yes |
| 1998 | 359 | 98% | Yes |
| 1999 | 356 | 98% | Yes |
| 2000 | 361 | 99% | Yes |
| 2001 | 357 | 98% | Yes |
| 2002 | 359 | 98% | Yes |
| 2003 | 354 | 97% | Yes |
| 2004 | 360 | 98% | Yes |
| 2005 | 363 | 99% | Yes |
| 2006 | 361 | 99% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 354 | 97% | Yes |
| 2011 | 362 | 99% | Yes |
| 2012 | 361 | 99% | Yes |
| 2013 | 356 | 98% | Yes |
| 2014 | 359 | 98% | Yes |
| 2015 | 360 | 99% | Yes |
| 2016 | 361 | 99% | Yes |
| 2017 | 361 | 99% | Yes |
| 2018 | 356 | 98% | Yes |
| 2019 | 361 | 99% | Yes |
| 2020 | 362 | 99% | Yes |
| 2021 | 354 | 97% | Yes |
| 2022 | 360 | 99% | Yes |
| 2023 | 360 | 99% | Yes |
| 2024 | 360 | 98% | Yes |
| 2025 | 359 | 98% | Yes |
| 2026 | 240 | 66% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 29 August 2026 | Heathrow, GB | daily high min (Provisional) | 17.3 C (63.1 F) | 0.5 C (0.9 F) | 17 years | 12 of 100 (Routine) |
| 27 August 2026 | Heathrow, GB | daily high min (Provisional) | 18.7 C (65.7 F) | 1.9 C (3.4 F) | 23 years | 19 of 100 (Routine) |
| 18 August 2026 | Heathrow, GB | daily high min (Provisional) | 18.6 C (65.5 F) | 0.2 C (0.4 F) | 13 years | 10 of 100 (Routine) |
| 15 August 2026 | Heathrow, GB | daily high min | 20.1 C (68.2 F) | 1.4 C (2.5 F) | 24 years | 18 of 100 (Routine) |
| 14 August 2026 | Heathrow, GB | daily high min | 19.1 C (66.4 F) | 0.9 C (1.6 F) | 4 years | 10 of 100 (Routine) |
| 13 August 2026 | Heathrow, GB | daily high max | 34.7 C (94.5 F) | 1.6 C (2.9 F) | 4 years | 11 of 100 (Routine) |
| 12 August 2026 | Heathrow, GB | daily high max | 37.7 C (99.9 F) | 3.5 C (6.3 F) | 4 years | 17 of 100 (Routine) |
| 28 July 2026 | Heathrow, GB | daily high max | 35.0 C (95.0 F) | 2.5 C (4.5 F) | 24 years | 19 of 100 (Routine) |
| 10 July 2026 | Heathrow, GB | daily high min | 21.3 C (70.3 F) | 4.2 C (7.6 F) | 9 years | 25 of 100 (Routine) |
| 9 July 2026 | Heathrow, GB | daily high min | 19.5 C (67.1 F) | 0.8 C (1.4 F) | 55 years | 25 of 100 (Routine) |
| 8 July 2026 | Heathrow, GB | daily high max | 34.9 C (94.8 F) | 3.7 C (6.7 F) | 16 years | 19 of 100 (Routine) |
| 7 July 2026 | Heathrow, GB | daily high max | 33.7 C (92.7 F) | 2.0 C (3.6 F) | 41 years | 23 of 100 (Routine) |
| 6 July 2026 | Heathrow, GB | daily high max | 32.0 C (89.6 F) | 0.4 C (0.7 F) | 49 years | 21 of 100 (Routine) |
| 5 July 2026 | Heathrow, GB | daily high max | 33.3 C (91.9 F) | 0.2 C (0.4 F) | 49 years | 20 of 100 (Routine) |
| 27 June 2026 | Heathrow, GB | daily high min (Tie) | 20.4 C (68.7 F) | tie | 49 years | 5 of 100 (Routine) |
| 26 June 2026 | Heathrow, GB | all-time high min | 22.6 C (72.7 F) | 0.3 C (0.5 F) | 9 years | 29 of 100 (Routine) |
| 25 June 2026 | Heathrow, GB | daily high max | 36.4 C (97.5 F) | 1.6 C (2.9 F) | 49 years | 24 of 100 (Routine) |
| 25 June 2026 | Heathrow, GB | daily high min | 21.4 C (70.5 F) | 3.1 C (5.6 F) | 5 years | 18 of 100 (Routine) |
| 24 June 2026 | Heathrow, GB | monthly high min | 22.1 C (71.8 F) | 1.3 C (2.3 F) | 49 years | 34 of 100 (Routine) |
| 23 June 2026 | Heathrow, GB | daily high min | 18.6 C (65.5 F) | 1.3 C (2.3 F) | 49 years | 24 of 100 (Routine) |
Climate Trend
66 complete years, 1960 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1960 | 10.6 C | -0.68 C |
| 1961 | 11.0 C | -0.28 C |
| 1962 | 9.4 C | -1.84 C |
| 1963 | 9.3 C | -1.91 C |
| 1964 | 10.4 C | -0.80 C |
| 1965 | 9.8 C | -1.40 C |
| 1966 | 10.5 C | -0.73 C |
| 1967 | 10.5 C | -0.72 C |
| 1968 | 10.3 C | -0.97 C |
| 1969 | 10.5 C | -0.72 C |
| 1970 | 10.7 C | -0.58 C |
| 1971 | 10.8 C | -0.41 C |
| 1972 | 10.4 C | -0.85 C |
| 1973 | 10.6 C | -0.64 C |
| 1974 | 10.6 C | -0.62 C |
| 1975 | 10.9 C | -0.31 C |
| 1976 | 11.3 C | +0.07 C |
| 1977 | 10.5 C | -0.70 C |
| 1978 | 10.4 C | -0.79 C |
| 1979 | 9.9 C | -1.30 C |
| 1980 | 10.3 C | -0.89 C |
| 1981 | 10.3 C | -0.98 C |
| 1982 | 11.0 C | -0.24 C |
| 1983 | 11.2 C | -0.08 C |
| 1984 | 10.9 C | -0.33 C |
| 1985 | 10.1 C | -1.14 C |
| 1986 | 9.9 C | -1.30 C |
| 1987 | 10.2 C | -0.99 C |
| 1988 | 10.8 C | -0.40 C |
| 1989 | 12.0 C | +0.78 C |
| 1990 | 12.1 C | +0.82 C |
| 1991 | 10.6 C | -0.59 C |
| 1992 | 11.2 C | -0.04 C |
| 1993 | 10.8 C | -0.42 C |
| 1994 | 11.7 C | +0.46 C |
| 1995 | 11.9 C | +0.65 C |
| 1996 | 10.5 C | -0.69 C |
| 1997 | 12.1 C | +0.83 C |
| 1998 | 11.6 C | +0.40 C |
| 1999 | 11.9 C | +0.67 C |
| 2000 | 11.6 C | +0.34 C |
| 2001 | 11.3 C | +0.04 C |
| 2002 | 12.1 C | +0.83 C |
| 2003 | 12.1 C | +0.87 C |
| 2004 | 11.8 C | +0.61 C |
| 2005 | 11.8 C | +0.55 C |
| 2006 | 12.3 C | +1.07 C |
| 2007 | 11.9 C | +0.70 C |
| 2008 | 11.4 C | +0.12 C |
| 2009 | 11.7 C | +0.44 C |
| 2010 | 10.6 C | -0.64 C |
| 2011 | 12.3 C | +1.10 C |
| 2012 | 11.3 C | +0.07 C |
| 2013 | 11.1 C | -0.12 C |
| 2014 | 12.6 C | +1.37 C |
| 2015 | 12.1 C | +0.82 C |
| 2016 | 11.9 C | +0.63 C |
| 2017 | 12.2 C | +0.93 C |
| 2018 | 12.5 C | +1.23 C |
| 2019 | 12.2 C | +0.92 C |
| 2020 | 12.6 C | +1.32 C |
| 2021 | 11.7 C | +0.44 C |
| 2022 | 12.8 C | +1.59 C |
| 2023 | 12.7 C | +1.48 C |
| 2024 | 12.5 C | +1.29 C |
| 2025 | 12.8 C | +1.53 C |
The annual mean temperature here has risen by 0.4 C (0.3 to 0.4) per decade over 1960 to 2025. In Fahrenheit: 0.7 F (0.6 to 0.8) per decade. The slope is a straight line fitted to 66 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.4 C (0.3 to 0.4) per decade | 0.7 F (0.6 to 0.8) per decade | 1960 to 2025 | 66 | Rise |
| Mean daily maximum | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.6 to 0.9) per decade | 1960 to 2025 | 66 | Rise |
| Mean daily minimum | 0.3 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.7) per decade | 1960 to 2025 | 66 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1959 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.2 C (104.4 F) | 2022 | 31.4 C (88.5 F) | 68 |
| Coldest night (TNn) | -13.2 C (8.2 F) | 1963 | -5.5 C (22.1 F) | 67 |
| Wettest day (Rx1day) | 61.8 mm (2.4 in) | 1992 | 30.5 mm (1.2 in) | 67 |
| Wettest five days (Rx5day) | 87.2 mm (3.4 in) | 1969 | 50.1 mm (2.0 in) | 67 |
| Longest dry spell (CDD) | 58 days | 2018 | 23 days | 67 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1959 | 11.7 C (53.1 F) |
| 1960 | 28.9 C (84.0 F) |
| 1961 | 33.8 C (92.8 F) |
| 1962 | 25.5 C (77.9 F) |
| 1963 | 28.2 C (82.8 F) |
| 1964 | 30.1 C (86.2 F) |
| 1965 | 27.4 C (81.3 F) |
| 1966 | 28.3 C (82.9 F) |
| 1967 | 30.0 C (86.0 F) |
| 1968 | 32.6 C (90.7 F) |
| 1969 | 31.8 C (89.2 F) |
| 1970 | 31.5 C (88.7 F) |
| 1971 | 29.7 C (85.5 F) |
| 1972 | 27.7 C (81.9 F) |
| 1973 | 31.4 C (88.5 F) |
| 1974 | 25.6 C (78.1 F) |
| 1975 | 34.2 C (93.6 F) |
| 1976 | 34.8 C (94.6 F) |
| 1977 | 28.6 C (83.5 F) |
| 1978 | 27.0 C (80.6 F) |
| 1979 | 29.9 C (85.8 F) |
| 1980 | 29.0 C (84.2 F) |
| 1981 | 28.8 C (83.8 F) |
| 1982 | 29.3 C (84.7 F) |
| 1983 | 32.8 C (91.0 F) |
| 1984 | 31.7 C (89.1 F) |
| 1985 | 29.8 C (85.6 F) |
| 1986 | 30.6 C (87.1 F) |
| 1987 | 29.2 C (84.6 F) |
| 1988 | 29.1 C (84.4 F) |
| 1989 | 34.2 C (93.6 F) |
| 1990 | 36.5 C (97.7 F) |
| 1991 | 29.7 C (85.5 F) |
| 1992 | 30.2 C (86.4 F) |
| 1993 | 28.4 C (83.1 F) |
| 1994 | 33.1 C (91.6 F) |
| 1995 | 34.3 C (93.7 F) |
| 1996 | 31.8 C (89.2 F) |
| 1997 | 31.5 C (88.7 F) |
| 1998 | 31.2 C (88.2 F) |
| 1999 | 32.7 C (90.9 F) |
| 2000 | 31.4 C (88.5 F) |
| 2001 | 31.9 C (89.4 F) |
| 2002 | 32.5 C (90.5 F) |
| 2003 | 37.9 C (100.2 F) |
| 2004 | 30.5 C (86.9 F) |
| 2005 | 32.6 C (90.7 F) |
| 2006 | 35.5 C (95.9 F) |
| 2007 | 29.0 C (84.2 F) |
| 2008 | 29.5 C (85.1 F) |
| 2009 | 30.9 C (87.6 F) |
| 2010 | 31.2 C (88.2 F) |
| 2011 | 31.2 C (88.2 F) |
| 2012 | 30.5 C (86.9 F) |
| 2013 | 34.1 C (93.4 F) |
| 2014 | 30.3 C (86.5 F) |
| 2015 | 36.7 C (98.1 F) |
| 2016 | 33.2 C (91.8 F) |
| 2017 | 34.5 C (94.1 F) |
| 2018 | 35.0 C (95.0 F) |
| 2019 | 37.9 C (100.2 F) |
| 2020 | 37.8 C (100.0 F) |
| 2021 | 32.2 C (90.0 F) |
| 2022 | 40.2 C (104.4 F) |
| 2023 | 33.0 C (91.4 F) |
| 2024 | 33.0 C (91.4 F) |
| 2025 | 33.9 C (93.0 F) |
| 2026 | 37.7 C (99.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1959 | n/a |
| 1960 | -5.0 C (23.0 F) |
| 1961 | -5.9 C (21.4 F) |
| 1962 | -12.8 C (9.0 F) |
| 1963 | -13.2 C (8.2 F) |
| 1964 | -7.1 C (19.2 F) |
| 1965 | -7.4 C (18.7 F) |
| 1966 | -6.8 C (19.8 F) |
| 1967 | -7.3 C (18.9 F) |
| 1968 | -7.8 C (18.0 F) |
| 1969 | -6.8 C (19.8 F) |
| 1970 | -6.5 C (20.3 F) |
| 1971 | -4.2 C (24.4 F) |
| 1972 | -9.3 C (15.3 F) |
| 1973 | -4.5 C (23.9 F) |
| 1974 | -1.9 C (28.6 F) |
| 1975 | -5.4 C (22.3 F) |
| 1976 | -5.5 C (22.1 F) |
| 1977 | -4.5 C (23.9 F) |
| 1978 | -6.3 C (20.7 F) |
| 1979 | -7.5 C (18.5 F) |
| 1980 | -6.0 C (21.2 F) |
| 1981 | -11.8 C (10.8 F) |
| 1982 | -10.1 C (13.8 F) |
| 1983 | -7.0 C (19.4 F) |
| 1984 | -3.1 C (26.4 F) |
| 1985 | -8.0 C (17.6 F) |
| 1986 | -9.6 C (14.7 F) |
| 1987 | -9.1 C (15.6 F) |
| 1988 | -4.0 C (24.8 F) |
| 1989 | -5.6 C (21.9 F) |
| 1990 | -4.6 C (23.7 F) |
| 1991 | -8.9 C (16.0 F) |
| 1992 | -5.4 C (22.3 F) |
| 1993 | -6.6 C (20.1 F) |
| 1994 | -5.5 C (22.1 F) |
| 1995 | -5.0 C (23.0 F) |
| 1996 | -5.3 C (22.5 F) |
| 1997 | -5.5 C (22.1 F) |
| 1998 | -3.9 C (25.0 F) |
| 1999 | -5.5 C (22.1 F) |
| 2000 | -5.5 C (22.1 F) |
| 2001 | -4.3 C (24.3 F) |
| 2002 | -5.3 C (22.5 F) |
| 2003 | -5.1 C (22.8 F) |
| 2004 | -4.8 C (23.4 F) |
| 2005 | -4.8 C (23.4 F) |
| 2006 | -4.4 C (24.1 F) |
| 2007 | -5.2 C (22.6 F) |
| 2008 | -4.0 C (24.8 F) |
| 2009 | -6.8 C (19.8 F) |
| 2010 | -9.4 C (15.1 F) |
| 2011 | -2.4 C (27.7 F) |
| 2012 | -7.6 C (18.3 F) |
| 2013 | -4.9 C (23.2 F) |
| 2014 | -4.1 C (24.6 F) |
| 2015 | -5.9 C (21.4 F) |
| 2016 | -4.6 C (23.7 F) |
| 2017 | -4.5 C (23.9 F) |
| 2018 | -5.4 C (22.3 F) |
| 2019 | -5.2 C (22.6 F) |
| 2020 | -3.2 C (26.2 F) |
| 2021 | -4.2 C (24.4 F) |
| 2022 | -5.9 C (21.4 F) |
| 2023 | -8.4 C (16.9 F) |
| 2024 | -5.4 C (22.3 F) |
| 2025 | -5.5 C (22.1 F) |
| 2026 | -5.9 C (21.4 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1959 | n/a |
| 1960 | 37.9 mm (1.5 in) |
| 1961 | 23.8 mm (0.9 in) |
| 1962 | 52.2 mm (2.1 in) |
| 1963 | 26.9 mm (1.1 in) |
| 1964 | 29.9 mm (1.2 in) |
| 1965 | 38.0 mm (1.5 in) |
| 1966 | 36.8 mm (1.4 in) |
| 1967 | 53.7 mm (2.1 in) |
| 1968 | 39.6 mm (1.6 in) |
| 1969 | 57.0 mm (2.2 in) |
| 1970 | 52.5 mm (2.1 in) |
| 1971 | 36.3 mm (1.4 in) |
| 1972 | 18.8 mm (0.7 in) |
| 1973 | 41.0 mm (1.6 in) |
| 1974 | 30.5 mm (1.2 in) |
| 1975 | 41.4 mm (1.6 in) |
| 1976 | 24.6 mm (1.0 in) |
| 1977 | 51.9 mm (2.0 in) |
| 1978 | 29.5 mm (1.2 in) |
| 1979 | 35.6 mm (1.4 in) |
| 1980 | 41.7 mm (1.6 in) |
| 1981 | 29.3 mm (1.2 in) |
| 1982 | 27.7 mm (1.1 in) |
| 1983 | 26.9 mm (1.1 in) |
| 1984 | 36.0 mm (1.4 in) |
| 1985 | 35.4 mm (1.4 in) |
| 1986 | 25.4 mm (1.0 in) |
| 1987 | 53.1 mm (2.1 in) |
| 1988 | 28.2 mm (1.1 in) |
| 1989 | 26.7 mm (1.1 in) |
| 1990 | 15.9 mm (0.6 in) |
| 1991 | 28.9 mm (1.1 in) |
| 1992 | 61.8 mm (2.4 in) |
| 1993 | 59.4 mm (2.3 in) |
| 1994 | 24.7 mm (1.0 in) |
| 1995 | 27.8 mm (1.1 in) |
| 1996 | 20.6 mm (0.8 in) |
| 1997 | 31.6 mm (1.2 in) |
| 1998 | 24.4 mm (1.0 in) |
| 1999 | 43.8 mm (1.7 in) |
| 2000 | 36.6 mm (1.4 in) |
| 2001 | 18.0 mm (0.7 in) |
| 2002 | 29.2 mm (1.1 in) |
| 2003 | 27.0 mm (1.1 in) |
| 2004 | 34.4 mm (1.4 in) |
| 2005 | 21.0 mm (0.8 in) |
| 2006 | 26.8 mm (1.1 in) |
| 2007 | 35.8 mm (1.4 in) |
| 2008 | 26.4 mm (1.0 in) |
| 2009 | 31.2 mm (1.2 in) |
| 2010 | 21.8 mm (0.9 in) |
| 2011 | 27.2 mm (1.1 in) |
| 2012 | 26.2 mm (1.0 in) |
| 2013 | 29.8 mm (1.2 in) |
| 2014 | 26.8 mm (1.1 in) |
| 2015 | 51.6 mm (2.0 in) |
| 2016 | 27.0 mm (1.1 in) |
| 2017 | 36.8 mm (1.4 in) |
| 2018 | 31.8 mm (1.3 in) |
| 2019 | 31.8 mm (1.3 in) |
| 2020 | 38.4 mm (1.5 in) |
| 2021 | 33.4 mm (1.3 in) |
| 2022 | 34.4 mm (1.4 in) |
| 2023 | 36.0 mm (1.4 in) |
| 2024 | 28.6 mm (1.1 in) |
| 2025 | 20.6 mm (0.8 in) |
| 2026 | 30.2 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1959 | n/a |
| 1960 | 48.5 mm (1.9 in) |
| 1961 | 41.9 mm (1.6 in) |
| 1962 | 56.6 mm (2.2 in) |
| 1963 | 54.2 mm (2.1 in) |
| 1964 | 60.7 mm (2.4 in) |
| 1965 | 48.3 mm (1.9 in) |
| 1966 | 61.0 mm (2.4 in) |
| 1967 | 55.9 mm (2.2 in) |
| 1968 | 74.5 mm (2.9 in) |
| 1969 | 87.2 mm (3.4 in) |
| 1970 | 55.4 mm (2.2 in) |
| 1971 | 68.3 mm (2.7 in) |
| 1972 | 45.1 mm (1.8 in) |
| 1973 | 50.3 mm (2.0 in) |
| 1974 | 70.5 mm (2.8 in) |
| 1975 | 57.5 mm (2.3 in) |
| 1976 | 40.2 mm (1.6 in) |
| 1977 | 81.2 mm (3.2 in) |
| 1978 | 66.1 mm (2.6 in) |
| 1979 | 44.9 mm (1.8 in) |
| 1980 | 54.0 mm (2.1 in) |
| 1981 | 39.4 mm (1.6 in) |
| 1982 | 50.1 mm (2.0 in) |
| 1983 | 36.6 mm (1.4 in) |
| 1984 | 47.9 mm (1.9 in) |
| 1985 | 40.2 mm (1.6 in) |
| 1986 | 41.7 mm (1.6 in) |
| 1987 | 85.0 mm (3.3 in) |
| 1988 | 48.1 mm (1.9 in) |
| 1989 | 61.8 mm (2.4 in) |
| 1990 | 48.5 mm (1.9 in) |
| 1991 | 46.2 mm (1.8 in) |
| 1992 | 80.6 mm (3.2 in) |
| 1993 | 76.4 mm (3.0 in) |
| 1994 | 40.1 mm (1.6 in) |
| 1995 | 57.5 mm (2.3 in) |
| 1996 | 34.8 mm (1.4 in) |
| 1997 | 43.2 mm (1.7 in) |
| 1998 | 45.6 mm (1.8 in) |
| 1999 | 74.8 mm (2.9 in) |
| 2000 | 57.4 mm (2.3 in) |
| 2001 | 43.4 mm (1.7 in) |
| 2002 | 52.0 mm (2.0 in) |
| 2003 | 74.2 mm (2.9 in) |
| 2004 | 41.6 mm (1.6 in) |
| 2005 | 31.2 mm (1.2 in) |
| 2006 | 41.4 mm (1.6 in) |
| 2007 | 64.0 mm (2.5 in) |
| 2008 | 49.0 mm (1.9 in) |
| 2009 | 60.0 mm (2.4 in) |
| 2010 | 49.4 mm (1.9 in) |
| 2011 | 37.0 mm (1.5 in) |
| 2012 | 51.4 mm (2.0 in) |
| 2013 | 41.8 mm (1.6 in) |
| 2014 | 52.0 mm (2.0 in) |
| 2015 | 74.0 mm (2.9 in) |
| 2016 | 40.4 mm (1.6 in) |
| 2017 | 44.0 mm (1.7 in) |
| 2018 | 42.6 mm (1.7 in) |
| 2019 | 57.0 mm (2.2 in) |
| 2020 | 72.8 mm (2.9 in) |
| 2021 | 48.0 mm (1.9 in) |
| 2022 | 60.0 mm (2.4 in) |
| 2023 | 51.4 mm (2.0 in) |
| 2024 | 50.0 mm (2.0 in) |
| 2025 | 41.2 mm (1.6 in) |
| 2026 | 33.0 mm (1.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1959 | n/a |
| 1960 | 17 days |
| 1961 | 27 days |
| 1962 | 23 days |
| 1963 | 27 days |
| 1964 | 19 days |
| 1965 | 14 days |
| 1966 | 18 days |
| 1967 | 21 days |
| 1968 | 14 days |
| 1969 | 25 days |
| 1970 | 31 days |
| 1971 | 33 days |
| 1972 | 29 days |
| 1973 | 21 days |
| 1974 | 22 days |
| 1975 | 16 days |
| 1976 | 38 days |
| 1977 | 21 days |
| 1978 | 44 days |
| 1979 | 28 days |
| 1980 | 19 days |
| 1981 | 21 days |
| 1982 | 23 days |
| 1983 | 23 days |
| 1984 | 24 days |
| 1985 | 22 days |
| 1986 | 28 days |
| 1987 | 25 days |
| 1988 | 22 days |
| 1989 | 30 days |
| 1990 | 39 days |
| 1991 | 25 days |
| 1992 | 17 days |
| 1993 | 53 days |
| 1994 | 19 days |
| 1995 | 36 days |
| 1996 | 20 days |
| 1997 | 51 days |
| 1998 | 18 days |
| 1999 | 18 days |
| 2000 | 20 days |
| 2001 | 19 days |
| 2002 | 31 days |
| 2003 | 27 days |
| 2004 | 19 days |
| 2005 | 21 days |
| 2006 | 21 days |
| 2007 | 30 days |
| 2008 | 19 days |
| 2009 | 18 days |
| 2010 | 35 days |
| 2011 | 31 days |
| 2012 | 16 days |
| 2013 | 22 days |
| 2014 | 16 days |
| 2015 | 20 days |
| 2016 | 18 days |
| 2017 | 34 days |
| 2018 | 58 days |
| 2019 | 22 days |
| 2020 | 29 days |
| 2021 | 25 days |
| 2022 | 26 days |
| 2023 | 27 days |
| 2024 | 22 days |
| 2025 | 27 days |
| 2026 | 58 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
65 years with a frostAcross 65 years with a frost, the median last spring frost at Heathrow falls on 6 April and the median first autumn frost on 15 November, which leaves a median of 225 days between them.
In 1995 to 2025 the median growing season was 240 days. That is 24 days more than in 1960 to 1989.
Fitted over all years, the growing season changes by +6.4 days per decade at this station.
| Measure | Median, all years | Earliest period (1960 to 1989) | Recent period (1995 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 6 April | 11 April | 25 March | 17 days earlier | -3.5 days per decade |
| First autumn frost | 15 November | 9 November | 18 November | 9 days later | +2.9 days per decade |
| Growing days | 225 days | 216 days | 240 days | 24 days more | +6.4 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
66 years, 1960 to 2025A day with at least 31.5 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 69.7 mm (2.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 31.5 mm (1.2 in) | |
| 5 years | 40.8 mm (1.6 in) | |
| 10 years | 47.4 mm (1.9 in) | |
| 25 years | 56.0 mm (2.2 in) | |
| 50 years | 62.7 mm (2.5 in) | |
| 100 years | 69.7 mm (2.7 in) | Longer than the 66 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 66 years of values from 1960 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 61.8 mm (2.4 in) in 1992; 59.4 mm (2.3 in) in 1993; 57.0 mm (2.2 in) in 1969.
Station Changes
3 suspected3 changes were suspected in the annual mean temperature of Heathrow, at 1969, 1989 and 2013. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1969 ran 0.1 C (0.2 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1989 ran 0.1 C (0.1 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2013 ran 0.1 C (0.2 F) higher than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1969 | +0.1 | +0.2 | likely | 5 |
| 1989 | +0.1 | +0.1 | likely | 5 |
| 2013 | +0.1 | +0.2 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Heathrow had a mean temperature of 12.2 C (54.0 F) and 631.3 mm (24.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Nantes-Bouguenais (France, 504 km away), Le Bourget (France, 313 km away) and Rennes-St Jacques (France, 410 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Nantes-Bouguenais | France | 504 km (313 mi) | 11.9 C (53.5 F) | 787.4 mm (31.0 in) | 0.78 |
| Le Bourget | France | 313 km (194 mi) | 11.7 C (53.0 F) | 641.5 mm (25.3 in) | 0.88 |
| Rennes-St Jacques | France | 410 km (255 mi) | 11.4 C (52.4 F) | 648.8 mm (25.5 in) | 0.92 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).