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Heathrow Weather Records (UKM00003772)

Record envelope, standing records and threshold days for Heathrow (UKM00003772), United Kingdom, with 77 years of record.

Key Facts for Heathrow

  • Heathrow (UKM00003772) is a weather station in United Kingdom at 51.48 latitude and -0.46 longitude, 25 m (83 ft) above sea level.
  • The station reports from 1949 to 2025, 77 years of record.
  • 1,464 records set at Heathrow still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Heathrow set a daily record high maximum temperature of 23.5 C (74.3 F) on 28 April 2025.

About the Station

  • Location: United Kingdom, 51.48 latitude, -0.46 longitude.
  • Elevation: 25 m (83 ft).
  • Period of record: 1949 to 2025, 77 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

1 days at or beyond a record
Daily record high and record low at Heathrow, with 2026 drawn through them The band shows the record high and record low for each calendar day at Heathrow. The lines show the 2026 daily maximum and minimum. 1 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Heathrow. The lines show the 2026 daily maximum and minimum. 1 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Heathrow, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan15.7 C (60.3 F)-9.0 C (15.8 F)6.1 C (43.0 F)n/a
Feb18.6 C (65.5 F)-9.6 C (14.7 F)10.6 C (51.1 F)n/a
Mar22.8 C (73.0 F)-5.1 C (22.8 F)17.4 C (63.3 F)1.4 C (34.5 F)
Apr27.4 C (81.3 F)-2.4 C (27.7 F)23.5 C (74.3 F)n/a
May29.4 C (84.9 F)-4.6 C (23.7 F)19.6 C (67.3 F)5.0 C (41.0 F)
Jun35.0 C (95.0 F)2.9 C (37.2 F)n/a10.8 C (51.4 F)
Jul40.2 C (104.4 F)6.7 C (44.1 F)26.0 C (78.8 F)17.0 C (62.6 F)
Aug37.9 C (100.2 F)0.0 C (32.0 F)27.2 C (81.0 F)9.5 C (49.1 F)
Sep33.0 C (91.4 F)-1.8 C (28.8 F)n/an/a
Oct28.8 C (83.8 F)-4.0 C (24.8 F)n/an/a
Nov20.8 C (69.4 F)-5.8 C (21.6 F)n/an/a
Dec16.4 C (61.5 F)-12.0 C (10.4 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Heathrow by the year they were set 1,464 records at Heathrow still stand. 1976 holds the most, with 65. 0204060801973: 221974: 281975: 221976: 651977: 361978: 441979: 521980: 421981: 491982: 221983: 311984: 141985: 451986: 321987: 321988: 121989: 331990: 361991: 291992: 201993: 301994: 301995: 301996: 421997: 411998: 351999: 222000: 172001: 212002: 232003: 282004: 182005: 302006: 152007: 122008: 142009: 402010: 302011: 302012: 292013: 302014: 192015: 292016: 102017: 152018: 172019: 82020: 112021: 132022: 342023: 402024: 342025: 1197319791985199119972003200920152021
1,464 records at Heathrow still stand. 1976 holds the most, with 65.
Standing records at Heathrow by the year they were set
Year setStanding records
197322
197428
197522
197665
197736
197844
197952
198042
198149
198222
198331
198414
198545
198632
198732
198812
198933
199036
199129
199220
199330
199430
199530
199642
199741
199835
199922
200017
200121
200223
200328
200418
200530
200615
200712
200814
200940
201030
201130
201229
201330
201419
201529
201610
201715
201817
20198
202011
202113
202234
202340
202434
20251

All-Time Record Progression

3 new records
When Heathrow set new all-time records 3 all-time records were set at Heathrow between 10 August 2003 and 19 July 2022. Each dot is a new record. Record high maximum temperatureRecord high minimum temperature10 August 2003: Record high maximum temperature 37.9 C (100.2 F)12 August 2020: Record high minimum temperature 21.7 C (71.1 F)19 July 2022: Record high maximum temperature 40.2 C (104.4 F)2005201020152020
3 all-time records were set at Heathrow between 10 August 2003 and 19 July 2022. Each dot is a new record.
When Heathrow set new all-time records
DateKindDetail
2003-08-10Record high maximum temperatureRecord high maximum temperature 37.9 C (100.2 F)
2020-08-12Record high minimum temperatureRecord high minimum temperature 21.7 C (71.1 F)
2022-07-19Record high maximum temperatureRecord high maximum temperature 40.2 C (104.4 F)

Wettest Day of Each Month

Dec: 52.1 mm (2.1 in)
Record daily precipitation for each month at Heathrow The wettest day on record for each calendar month at Heathrow. The most was 52.1 mm (2.1 in) on 24 December 1981. 0204060 Jan: 27.9 mm (1.1 in), 1 January 1977 Jan Feb: 32.5 mm (1.3 in), 10 February 2009 Feb Mar: 38.6 mm (1.5 in), 3 March 1985 Mar Apr: 35.1 mm (1.4 in), 8 April 1979 Apr May: 48.0 mm (1.9 in), 30 May 1992 May Jun: 39.9 mm (1.6 in), 14 June 1980 Jun Jul: 39.1 mm (1.5 in), 21 July 1992 Jul Aug: 48.0 mm (1.9 in), 27 August 2015 Aug Sep: 49.0 mm (1.9 in), 14 September 1975 Sep Oct: 43.9 mm (1.7 in), 13 October 1993 Oct Nov: 32.0 mm (1.3 in), 19 November 1991 Nov Dec: 52.1 mm (2.1 in), 24 December 1981 Dec
The wettest day on record for each calendar month at Heathrow. The most was 52.1 mm (2.1 in) on 24 December 1981.
Record daily precipitation for each month at Heathrow
MonthRecord daily precipitation (mm)Date
Jan27.9 mm (1.1 in)1 January 1977
Feb32.5 mm (1.3 in)10 February 2009
Mar38.6 mm (1.5 in)3 March 1985
Apr35.1 mm (1.4 in)8 April 1979
May48.0 mm (1.9 in)30 May 1992
Jun39.9 mm (1.6 in)14 June 1980
Jul39.1 mm (1.5 in)21 July 1992
Aug48.0 mm (1.9 in)27 August 2015
Sep49.0 mm (1.9 in)14 September 1975
Oct43.9 mm (1.7 in)13 October 1993
Nov32.0 mm (1.3 in)19 November 1991
Dec52.1 mm (2.1 in)24 December 1981

Period of Record Coverage

1973 to 2025
Days with data per year at Heathrow 53 years of record at Heathrow, 1973 to 2025. 43 years have data for under 90 percent of days and are left out of rankings: 1973, 1974, 1982, 1983, 1984, 1985, 1986, 1987 and others. 1973: 290 of 365 days1974: 280 of 365 days1975: 336 of 365 days1976: 344 of 366 days1977: 334 of 365 days1978: 337 of 365 days1979: 335 of 365 days1980: 333 of 366 days1981: 340 of 365 days1982: 234 of 365 days1983: 239 of 365 days1984: 247 of 366 days1985: 245 of 365 days1986: 250 of 365 days1987: 263 of 365 days1988: 256 of 366 days1989: 238 of 365 days1990: 263 of 365 days1991: 237 of 365 days1992: 263 of 366 days1993: 269 of 365 days1994: 325 of 365 days1995: 323 of 365 days1996: 322 of 366 days1997: 329 of 365 days1998: 321 of 365 days1999: 315 of 365 days2000: 274 of 366 days2001: 287 of 365 days2002: 252 of 365 days2003: 263 of 365 days2004: 248 of 366 days2005: 258 of 365 days2006: 223 of 365 days2007: 188 of 365 days2008: 176 of 366 days2009: 233 of 365 days2010: 296 of 365 days2011: 302 of 365 days2012: 300 of 366 days2013: 269 of 365 days2014: 265 of 365 days2015: 289 of 365 days2016: 38 of 366 days2017: 26 of 365 days2018: 41 of 365 days2019: 27 of 365 days2020: 46 of 366 days2021: 99 of 365 days2022: 325 of 365 days2023: 336 of 365 days2024: 333 of 366 days2025: 24 of 365 days19801990200020102020
53 years of record at Heathrow, 1973 to 2025. 43 years have data for under 90 percent of days and are left out of rankings: 1973, 1974, 1982, 1983, 1984, 1985, 1986, 1987 and others.
Days with data per year at Heathrow
YearDays with dataShare of yearComplete
197329079%No
197428077%No
197533692%Yes
197634494%Yes
197733492%Yes
197833792%Yes
197933592%Yes
198033391%Yes
198134093%Yes
198223464%No
198323965%No
198424767%No
198524567%No
198625068%No
198726372%No
198825670%No
198923865%No
199026372%No
199123765%No
199226372%No
199326974%No
199432589%No
199532388%No
199632288%No
199732990%Yes
199832188%No
199931586%No
200027475%No
200128779%No
200225269%No
200326372%No
200424868%No
200525871%No
200622361%No
200718852%No
200817648%No
200923364%No
201029681%No
201130283%No
201230082%No
201326974%No
201426573%No
201528979%No
20163810%No
2017267%No
20184111%No
2019277%No
20204613%No
20219927%No
202232589%No
202333692%Yes
202433391%Yes
2025247%No

Latest Records

20
Latest records at Heathrow
DateStationRecordValueBeat old record byOld record stoodSignificance
28 April 2025Heathrow, GBdaily high max23.5 C (74.3 F)0.1 C (0.2 F)38 years16 of 100 (Routine)
18 December 2024Heathrow, GBdaily high max14.3 C (57.7 F)0.2 C (0.4 F)37 years16 of 100 (Routine)
30 November 2024Heathrow, GBdaily high max14.8 C (58.6 F)0.8 C (1.4 F)45 years20 of 100 (Routine)
25 November 2024Heathrow, GBdaily high max16.1 C (61.0 F)1.8 C (3.2 F)23 years16 of 100 (Routine)
24 November 2024Heathrow, GBdaily high max18.0 C (64.4 F)3.0 C (5.4 F)44 years27 of 100 (Routine)
28 October 2024Heathrow, GBdaily high min10.9 C (51.6 F)0.7 C (1.3 F)14 years10 of 100 (Routine)
16 October 2024Heathrow, GBdaily high min14.2 C (57.6 F)1.2 C (2.2 F)36 years18 of 100 (Routine)
16 October 2024Heathrow, GBdaily high max21.5 C (70.7 F)1.4 C (2.5 F)29 years17 of 100 (Routine)
22 September 2024Heathrow, GBdaily rain12.4 mm (0.5 in)4.5 mm (0.18 in)48 years20 of 100 (Routine)
22 September 2024Heathrow, GBdaily high min16.0 C (60.8 F)1.7 C (3.1 F)24 years17 of 100 (Routine)
19 September 2024Heathrow, GBdaily high max25.9 C (78.6 F)1.4 C (2.5 F)10 years12 of 100 (Routine)
12 September 2024Heathrow, GBdaily low min6.3 C (43.3 F)0.6 C (1.1 F)26 years13 of 100 (Routine)
6 September 2024Heathrow, GBdaily rain22.1 mm (0.9 in)5.6 mm (0.22 in)13 years19 of 100 (Routine)
28 August 2024Heathrow, GBdaily high max29.4 C (84.9 F)1.4 C (2.5 F)49 years23 of 100 (Routine)
25 August 2024Heathrow, GBdaily rain (Tie)15.5 mm (0.6 in)tie37 years4 of 100 (Routine)
30 July 2024Heathrow, GBdaily high max32.0 C (89.6 F)0.2 C (0.4 F)30 years14 of 100 (Routine)
16 July 2024Heathrow, GBdaily rain28.7 mm (1.1 in)17.8 mm (0.7 in)48 years53 of 100 (Notable)
6 July 2024Heathrow, GBdaily rain21.1 mm (0.8 in)4.1 mm (0.16 in)41 years20 of 100 (Routine)
18 May 2024Heathrow, GBdaily high min11.8 C (53.2 F)0.7 C (1.3 F)2 years7 of 100 (Routine)
12 May 2024Heathrow, GBdaily high max27.0 C (80.6 F)1.0 C (1.8 F)44 years20 of 100 (Routine)

Extremes by Year

1949 to 2025
Yearly extremes at Heathrow: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.2 C (104.4 F)202231.0 C (87.8 F)53
Coldest night (TNn)-12.0 C (10.4 F)1981-5.0 C (23.0 F)53
Wettest day (Rx1day)52.1 mm (2.1 in)198128.7 mm (1.1 in)63
Wettest five days (Rx5day)85.4 mm (3.4 in)199946.0 mm (1.8 in)53
Longest dry spell (CDD)58 days201814 days59

Hottest day (TXx)

Hottest day (TXx) at Heathrow by year The hottest day of the year at Heathrow, 1949 to 2025. The record is 40.2 C (104.4 F) in 2022, marked on the chart; the median year is 31.0 C (87.8 F). 2025303540451960198020002020Record: 40.2 C (104.4 F) in 2022
The hottest day of the year at Heathrow, 1949 to 2025. The record is 40.2 C (104.4 F) in 2022, marked on the chart; the median year is 31.0 C (87.8 F).
Hottest day (TXx) at Heathrow by year
YearHottest day (TXx)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
197331.0 C (87.8 F)
197426.0 C (78.8 F)
197534.0 C (93.2 F)
197635.0 C (95.0 F)
197729.0 C (84.2 F)
197827.0 C (80.6 F)
197930.0 C (86.0 F)
198029.0 C (84.2 F)
198129.0 C (84.2 F)
198229.3 C (84.7 F)
198332.6 C (90.7 F)
198430.6 C (87.1 F)
198528.9 C (84.0 F)
198630.6 C (87.1 F)
198729.2 C (84.6 F)
198829.1 C (84.4 F)
198934.2 C (93.6 F)
199036.5 C (97.7 F)
199129.7 C (85.5 F)
199230.2 C (86.4 F)
199328.4 C (83.1 F)
199433.1 C (91.6 F)
199534.3 C (93.7 F)
199631.8 C (89.2 F)
199731.5 C (88.7 F)
199831.2 C (88.2 F)
199932.7 C (90.9 F)
200031.4 C (88.5 F)
200131.9 C (89.4 F)
200232.5 C (90.5 F)
200337.9 C (100.2 F)
200430.5 C (86.9 F)
200531.8 C (89.2 F)
200635.5 C (95.9 F)
200729.0 C (84.2 F)
200828.2 C (82.8 F)
200931.2 C (88.2 F)
201031.2 C (88.2 F)
201131.2 C (88.2 F)
201230.5 C (86.9 F)
201334.1 C (93.4 F)
201430.3 C (86.5 F)
201536.7 C (98.1 F)
201624.7 C (76.5 F)
201725.1 C (77.2 F)
201830.1 C (86.2 F)
201932.8 C (91.0 F)
202026.2 C (79.2 F)
202125.7 C (78.3 F)
202240.2 C (104.4 F)
202333.0 C (91.4 F)
202433.0 C (91.4 F)
202527.2 C (81.0 F)

Coldest night (TNn)

Coldest night (TNn) at Heathrow by year The coldest night of the year at Heathrow, 1949 to 2025. The record is -12.0 C (10.4 F) in 1981, marked on the chart; the median year is -5.0 C (23.0 F). -15-10-5051960198020002020Record: -12.0 C (10.4 F) in 1981
The coldest night of the year at Heathrow, 1949 to 2025. The record is -12.0 C (10.4 F) in 1981, marked on the chart; the median year is -5.0 C (23.0 F).
Coldest night (TNn) at Heathrow by year
YearColdest night (TNn)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1973-4.0 C (24.8 F)
1974-1.0 C (30.2 F)
1975-5.0 C (23.0 F)
1976-5.0 C (23.0 F)
1977-4.0 C (24.8 F)
1978-5.0 C (23.0 F)
1979-7.0 C (19.4 F)
1980-6.0 C (21.2 F)
1981-12.0 C (10.4 F)
1982-7.5 C (18.5 F)
1983-5.1 C (22.8 F)
1984-3.0 C (26.6 F)
1985-7.1 C (19.2 F)
1986-9.6 C (14.7 F)
1987-9.0 C (15.8 F)
1988-4.0 C (24.8 F)
1989-5.6 C (21.9 F)
1990-1.9 C (28.6 F)
1991-8.0 C (17.6 F)
1992-5.0 C (23.0 F)
1993-5.8 C (21.6 F)
1994-4.8 C (23.4 F)
1995-4.6 C (23.7 F)
1996-5.3 C (22.5 F)
1997-5.2 C (22.6 F)
1998-3.9 C (25.0 F)
1999-3.8 C (25.2 F)
2000-5.4 C (22.3 F)
2001-3.5 C (25.7 F)
2002-5.3 C (22.5 F)
2003-5.1 C (22.8 F)
2004-3.1 C (26.4 F)
2005-4.8 C (23.4 F)
2006-4.2 C (24.4 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)
2011-2.2 C (28.0 F)
2012-6.8 C (19.8 F)
2013-4.2 C (24.4 F)
2014-4.1 C (24.6 F)
2015-8.2 C (17.2 F)
2016-4.5 C (23.9 F)
2017-4.2 C (24.4 F)
2018-5.1 C (22.8 F)
2019-5.2 C (22.6 F)
2020-3.2 C (26.2 F)
2021-3.5 C (25.7 F)
2022-5.4 C (22.3 F)
2023-8.4 C (16.9 F)
2024-5.4 C (22.3 F)
20251.4 C (34.5 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Heathrow by year The wettest day of the year at Heathrow, 1949 to 2025. The record is 52.1 mm (2.1 in) in 1981, marked on the chart; the median year is 28.7 mm (1.1 in). 02040601960198020002020Record: 52.1 mm (2.1 in) in 1981
The wettest day of the year at Heathrow, 1949 to 2025. The record is 52.1 mm (2.1 in) in 1981, marked on the chart; the median year is 28.7 mm (1.1 in).
Wettest day (Rx1day) at Heathrow by year
YearWettest day (Rx1day)
19492.5 mm (0.10 in)
19503.6 mm (0.14 in)
19517.6 mm (0.30 in)
19526.6 mm (0.26 in)
19534.6 mm (0.18 in)
195410.9 mm (0.4 in)
19553.6 mm (0.14 in)
19562.5 mm (0.10 in)
19574.6 mm (0.18 in)
19584.6 mm (0.18 in)
197329.0 mm (1.1 in)
197431.0 mm (1.2 in)
197549.0 mm (1.9 in)
197623.9 mm (0.9 in)
197727.9 mm (1.1 in)
197825.9 mm (1.0 in)
197935.1 mm (1.4 in)
198041.9 mm (1.6 in)
198152.1 mm (2.1 in)
198229.5 mm (1.2 in)
198325.9 mm (1.0 in)
198440.9 mm (1.6 in)
198538.6 mm (1.5 in)
198622.1 mm (0.9 in)
198732.0 mm (1.3 in)
198826.9 mm (1.1 in)
198939.9 mm (1.6 in)
199024.4 mm (1.0 in)
199132.0 mm (1.3 in)
199248.0 mm (1.9 in)
199343.9 mm (1.7 in)
199419.1 mm (0.8 in)
199525.9 mm (1.0 in)
199619.1 mm (0.8 in)
199721.1 mm (0.8 in)
199823.9 mm (0.9 in)
199936.3 mm (1.4 in)
200034.0 mm (1.3 in)
200121.1 mm (0.8 in)
200220.8 mm (0.8 in)
200327.9 mm (1.1 in)
200433.8 mm (1.3 in)
200520.1 mm (0.8 in)
200629.0 mm (1.1 in)
200737.8 mm (1.5 in)
200829.5 mm (1.2 in)
200932.5 mm (1.3 in)
201024.6 mm (1.0 in)
201121.1 mm (0.8 in)
201229.0 mm (1.1 in)
201329.7 mm (1.2 in)
201426.9 mm (1.1 in)
201548.0 mm (1.9 in)
201627.7 mm (1.1 in)
201736.6 mm (1.4 in)
201836.3 mm (1.4 in)
201934.0 mm (1.3 in)
202030.5 mm (1.2 in)
202133.3 mm (1.3 in)
202230.5 mm (1.2 in)
202336.1 mm (1.4 in)
202428.7 mm (1.1 in)
20250.8 mm (0.03 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Heathrow by year The wettest five days of the year at Heathrow, 1949 to 2025. The record is 85.4 mm (3.4 in) in 1999, marked on the chart; the median year is 46.0 mm (1.8 in). 02550751001960198020002020Record: 85.4 mm (3.4 in) in 1999
The wettest five days of the year at Heathrow, 1949 to 2025. The record is 85.4 mm (3.4 in) in 1999, marked on the chart; the median year is 46.0 mm (1.8 in).
Wettest five days (Rx5day) at Heathrow by year
YearWettest five days (Rx5day)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
197329.6 mm (1.2 in)
197468.4 mm (2.7 in)
197557.1 mm (2.2 in)
197639.7 mm (1.6 in)
197740.2 mm (1.6 in)
197863.3 mm (2.5 in)
197948.3 mm (1.9 in)
198056.9 mm (2.2 in)
198162.2 mm (2.4 in)
198225.2 mm (1.0 in)
198333.3 mm (1.3 in)
198446.0 mm (1.8 in)
198545.7 mm (1.8 in)
198634.1 mm (1.3 in)
198766.5 mm (2.6 in)
198843.9 mm (1.7 in)
198941.4 mm (1.6 in)
199053.9 mm (2.1 in)
199143.9 mm (1.7 in)
199277.5 mm (3.1 in)
199372.8 mm (2.9 in)
199431.8 mm (1.3 in)
199554.9 mm (2.2 in)
199620.8 mm (0.8 in)
199736.1 mm (1.4 in)
199827.9 mm (1.1 in)
199985.4 mm (3.4 in)
200057.4 mm (2.3 in)
200141.6 mm (1.6 in)
200238.8 mm (1.5 in)
200369.4 mm (2.7 in)
200440.3 mm (1.6 in)
200531.3 mm (1.2 in)
200641.4 mm (1.6 in)
200764.0 mm (2.5 in)
200848.9 mm (1.9 in)
200959.7 mm (2.4 in)
201056.4 mm (2.2 in)
201136.9 mm (1.5 in)
201244.5 mm (1.8 in)
201341.6 mm (1.6 in)
201452.0 mm (2.0 in)
201573.8 mm (2.9 in)
201640.4 mm (1.6 in)
201744.1 mm (1.7 in)
201844.8 mm (1.8 in)
201957.1 mm (2.2 in)
202072.5 mm (2.9 in)
202148.0 mm (1.9 in)
202260.5 mm (2.4 in)
202352.1 mm (2.1 in)
202450.9 mm (2.0 in)
20250.0 mm (0.00 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Heathrow by year The longest dry spell of the year at Heathrow, 1949 to 2025. The record is 58 days in 2018, marked on the chart; the median year is 14 days. 02040601960198020002020Record: 58 days in 2018
The longest dry spell of the year at Heathrow, 1949 to 2025. The record is 58 days in 2018, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Heathrow by year
YearLongest dry spell (CDD)
1949n/a
19501 day
19511 day
19521 day
19531 day
1954n/a
19551 day
19561 day
1957n/a
1958n/a
197311 days
19749 days
197514 days
197638 days
197721 days
197834 days
197927 days
198023 days
198114 days
198214 days
198314 days
198414 days
19859 days
198610 days
198716 days
19889 days
198913 days
199015 days
199112 days
19927 days
19938 days
19947 days
199513 days
19967 days
199710 days
199811 days
199916 days
20002 days
20012 days
20026 days
200312 days
200411 days
200519 days
200621 days
200727 days
200815 days
200917 days
201033 days
201131 days
201216 days
201322 days
201416 days
201520 days
201618 days
201734 days
201858 days
201922 days
202032 days
202117 days
202226 days
202326 days
202422 days
20258 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.

Download the Data

  • Data for Heathrow standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Heathrow threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).