Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at London Int'l Airport. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at London Int'l Airport, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.7 C (62.1 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
13.3 C (55.9 F)
-29.5 C (-21.1 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-24.8 C (-12.6 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-12.2 C (10.0 F)
n/a
n/a
May
31.7 C (89.1 F)
-5.0 C (23.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
36.7 C (98.1 F)
5.0 C (41.0 F)
n/a
n/a
Aug
35.6 C (96.1 F)
1.5 C (34.7 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-18.3 C (-0.9 F)
n/a
n/a
Dec
18.5 C (65.3 F)
-26.9 C (-16.4 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at London Int'l Airport still stand. 1950 holds the most, with 54.
Standing records at London Int'l Airport by the year they were set
Year set
Standing records
1940
19
1941
39
1942
32
1943
36
1944
35
1945
53
1946
39
1947
39
1948
21
1949
44
1950
54
1951
35
1952
25
1953
34
1954
37
1955
41
1956
31
1957
32
1958
22
1959
42
1960
29
1961
20
1962
28
1963
44
1964
38
1965
50
1966
36
1967
38
1968
28
1969
18
1970
26
1971
27
1972
30
1973
30
1974
26
1975
28
1976
40
1977
41
1978
26
1979
47
1980
18
1981
28
1982
33
1983
25
All-Time Record Progression
2 new records
2 all-time records were set at London Int'l Airport between 15 January 1972 and 7 December 1977. Each dot is a new record.
When London Int'l Airport set new all-time records
Date
Kind
Detail
1972-01-15
Record low maximum temperature
Record low maximum temperature -19.4 C (-2.9 F)
1977-12-07
Record daily snowfall
Record daily snowfall 57.0 cm (22.4 in)
Wettest Day of Each Month
Jun: 82.6 mm (3.3 in)
The wettest day on record for each calendar month at London Int'l Airport. The most was 82.6 mm (3.3 in) on 25 June 1968.
Record daily precipitation for each month at London Int'l Airport
Month
Record daily precipitation (mm)
Date
Jan
46.0 mm (1.8 in)
14 January 1968
Feb
40.9 mm (1.6 in)
1 February 1968
Mar
43.2 mm (1.7 in)
27 March 1942
Apr
39.9 mm (1.6 in)
15 April 1954
May
50.3 mm (2.0 in)
31 May 1959
Jun
82.6 mm (3.3 in)
25 June 1968
Jul
63.0 mm (2.5 in)
5 July 1942
Aug
69.9 mm (2.8 in)
29 August 1940
Sep
54.6 mm (2.1 in)
26 September 1942
Oct
56.9 mm (2.2 in)
15 October 1954
Nov
49.0 mm (1.9 in)
5 November 1948
Dec
42.9 mm (1.7 in)
20 December 1949
Period of Record Coverage
1940 to 1983
Complete yearUnder 90 percent of days
44 years of record at London Int'l Airport, 1940 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1940.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at London Int'l Airport, 1941 to 1983. Blue stripes are years cooler than the station's own mean of 7.4 C (45.3 F); red stripes are warmer. The coolest year was 1978, at 6.0 C (42.9 F), and the warmest was 1953, at 8.8 C (47.9 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at London Int'l Airport as warming stripes, 1941 to 1983
Year
Annual mean temperature
Difference from the station mean
1941
8.4 C
+0.98 C
1942
7.7 C
+0.28 C
1943
7.0 C
-0.42 C
1944
7.8 C
+0.40 C
1945
7.0 C
-0.42 C
1946
8.3 C
+0.96 C
1947
7.5 C
+0.08 C
1948
7.5 C
+0.08 C
1949
8.7 C
+1.28 C
1950
6.7 C
-0.66 C
1951
7.5 C
+0.10 C
1952
8.3 C
+0.96 C
1953
8.8 C
+1.44 C
1954
7.9 C
+0.52 C
1955
8.5 C
+1.17 C
1956
7.5 C
+0.16 C
1957
7.9 C
+0.49 C
1958
7.1 C
-0.24 C
1959
8.0 C
+0.62 C
1960
7.3 C
-0.10 C
1961
7.8 C
+0.38 C
1962
7.1 C
-0.32 C
1963
6.6 C
-0.74 C
1964
7.7 C
+0.30 C
1965
6.7 C
-0.63 C
1966
6.7 C
-0.63 C
1967
6.5 C
-0.86 C
1968
6.8 C
-0.53 C
1969
6.9 C
-0.46 C
1970
7.1 C
-0.30 C
1971
7.4 C
+0.07 C
1972
6.3 C
-1.07 C
1973
8.1 C
+0.71 C
1974
6.8 C
-0.61 C
1975
7.7 C
+0.33 C
1976
6.5 C
-0.89 C
1977
7.2 C
-0.16 C
1978
6.0 C
-1.34 C
1980
6.5 C
-0.86 C
1981
7.1 C
-0.24 C
1982
7.1 C
-0.26 C
1983
7.9 C
+0.54 C
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.4) per decade over 1941 to 1983. In Fahrenheit: 0.5 F (0.2 to 0.7) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at London Int'l Airport
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.4 to -0.1) per decade
-0.4 F (-0.7 to -0.2) per decade
1941 to 1983
42
Fall
Mean daily maximum
-0.20 C (-0.36 to -0.04) per decade
-0.4 F (-0.6 to -0.1) per decade
1941 to 1983
42
Fall
Mean daily minimum
-0.3 C (-0.5 to -0.1) per decade
-0.5 F (-0.9 to -0.2) per decade
1941 to 1983
42
Fall
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
1940 to 1983
Yearly extremes at London Int'l Airport: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1941
33.3 C (91.9 F)
44
Coldest night (TNn)
-31.7 C (-25.1 F)
1970
-23.9 C (-11.0 F)
44
Wettest day (Rx1day)
82.6 mm (3.3 in)
1968
43.7 mm (1.7 in)
44
Wettest five days (Rx5day)
126.5 mm (5.0 in)
1954
76.6 mm (3.0 in)
44
Longest dry spell (CDD)
30 days
1963
16 days
44
Hottest day (TXx)
The hottest day of the year at London Int'l Airport, 1940 to 1983. The record is 36.7 C (98.1 F) in 1941, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at London Int'l Airport by year
Year
Hottest day (TXx)
1940
34.4 C (93.9 F)
1941
36.7 C (98.1 F)
1942
34.4 C (93.9 F)
1943
33.3 C (91.9 F)
1944
35.0 C (95.0 F)
1945
32.2 C (90.0 F)
1946
33.9 C (93.0 F)
1947
33.3 C (91.9 F)
1948
35.0 C (95.0 F)
1949
35.0 C (95.0 F)
1950
32.8 C (91.0 F)
1951
31.1 C (88.0 F)
1952
36.1 C (97.0 F)
1953
35.0 C (95.0 F)
1954
33.3 C (91.9 F)
1955
35.6 C (96.1 F)
1956
33.3 C (91.9 F)
1957
32.2 C (90.0 F)
1958
32.2 C (90.0 F)
1959
32.8 C (91.0 F)
1960
31.1 C (88.0 F)
1961
31.1 C (88.0 F)
1962
31.7 C (89.1 F)
1963
33.9 C (93.0 F)
1964
36.1 C (97.0 F)
1965
32.2 C (90.0 F)
1966
34.4 C (93.9 F)
1967
30.6 C (87.1 F)
1968
32.2 C (90.0 F)
1969
32.8 C (91.0 F)
1970
31.7 C (89.1 F)
1971
36.1 C (97.0 F)
1972
32.2 C (90.0 F)
1973
33.9 C (93.0 F)
1974
32.8 C (91.0 F)
1975
34.4 C (93.9 F)
1976
30.0 C (86.0 F)
1977
34.3 C (93.7 F)
1978
33.6 C (92.5 F)
1979
30.5 C (86.9 F)
1980
31.4 C (88.5 F)
1981
32.0 C (89.6 F)
1982
30.3 C (86.5 F)
1983
33.6 C (92.5 F)
Coldest night (TNn)
The coldest night of the year at London Int'l Airport, 1940 to 1983. The record is -31.7 C (-25.1 F) in 1970, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at London Int'l Airport by year
Year
Coldest night (TNn)
1940
-17.2 C (1.0 F)
1941
-22.8 C (-9.0 F)
1942
-26.7 C (-16.1 F)
1943
-28.9 C (-20.0 F)
1944
-27.8 C (-18.0 F)
1945
-26.7 C (-16.1 F)
1946
-20.6 C (-5.1 F)
1947
-19.4 C (-2.9 F)
1948
-27.2 C (-17.0 F)
1949
-17.2 C (1.0 F)
1950
-22.8 C (-9.0 F)
1951
-24.4 C (-11.9 F)
1952
-19.4 C (-2.9 F)
1953
-21.1 C (-6.0 F)
1954
-20.6 C (-5.1 F)
1955
-23.3 C (-9.9 F)
1956
-20.0 C (-4.0 F)
1957
-23.3 C (-9.9 F)
1958
-25.6 C (-14.1 F)
1959
-23.9 C (-11.0 F)
1960
-25.6 C (-14.1 F)
1961
-26.1 C (-15.0 F)
1962
-22.8 C (-9.0 F)
1963
-25.6 C (-14.1 F)
1964
-20.6 C (-5.1 F)
1965
-23.9 C (-11.0 F)
1966
-25.0 C (-13.0 F)
1967
-24.4 C (-11.9 F)
1968
-22.8 C (-9.0 F)
1969
-22.2 C (-8.0 F)
1970
-31.7 C (-25.1 F)
1971
-25.6 C (-14.1 F)
1972
-23.3 C (-9.9 F)
1973
-23.9 C (-11.0 F)
1974
-23.9 C (-11.0 F)
1975
-21.7 C (-7.1 F)
1976
-30.6 C (-23.1 F)
1977
-26.9 C (-16.4 F)
1978
-29.5 C (-21.1 F)
1979
-25.9 C (-14.6 F)
1980
-21.8 C (-7.2 F)
1981
-26.5 C (-15.7 F)
1982
-26.1 C (-15.0 F)
1983
-21.6 C (-6.9 F)
Wettest day (Rx1day)
The wettest day of the year at London Int'l Airport, 1940 to 1983. The record is 82.6 mm (3.3 in) in 1968, marked on the chart; the median year is 43.7 mm (1.7 in).
Wettest day (Rx1day) at London Int'l Airport by year
Year
Wettest day (Rx1day)
1940
69.9 mm (2.8 in)
1941
36.3 mm (1.4 in)
1942
63.0 mm (2.5 in)
1943
56.4 mm (2.2 in)
1944
43.9 mm (1.7 in)
1945
46.5 mm (1.8 in)
1946
81.8 mm (3.2 in)
1947
45.2 mm (1.8 in)
1948
49.0 mm (1.9 in)
1949
48.0 mm (1.9 in)
1950
42.9 mm (1.7 in)
1951
25.7 mm (1.0 in)
1952
42.7 mm (1.7 in)
1953
34.8 mm (1.4 in)
1954
56.9 mm (2.2 in)
1955
51.1 mm (2.0 in)
1956
42.7 mm (1.7 in)
1957
59.9 mm (2.4 in)
1958
39.6 mm (1.6 in)
1959
50.3 mm (2.0 in)
1960
42.4 mm (1.7 in)
1961
43.4 mm (1.7 in)
1962
35.3 mm (1.4 in)
1963
23.4 mm (0.9 in)
1964
50.8 mm (2.0 in)
1965
38.6 mm (1.5 in)
1966
52.6 mm (2.1 in)
1967
41.4 mm (1.6 in)
1968
82.6 mm (3.3 in)
1969
47.5 mm (1.9 in)
1970
33.0 mm (1.3 in)
1971
42.7 mm (1.7 in)
1972
59.7 mm (2.4 in)
1973
42.2 mm (1.7 in)
1974
32.3 mm (1.3 in)
1975
34.0 mm (1.3 in)
1976
48.5 mm (1.9 in)
1977
37.1 mm (1.5 in)
1978
42.4 mm (1.7 in)
1979
50.7 mm (2.0 in)
1980
48.2 mm (1.9 in)
1981
39.7 mm (1.6 in)
1982
42.5 mm (1.7 in)
1983
55.0 mm (2.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at London Int'l Airport, 1940 to 1983. The record is 126.5 mm (5.0 in) in 1954, marked on the chart; the median year is 76.6 mm (3.0 in).
Wettest five days (Rx5day) at London Int'l Airport by year
Year
Wettest five days (Rx5day)
1940
95.5 mm (3.8 in)
1941
47.7 mm (1.9 in)
1942
73.9 mm (2.9 in)
1943
90.4 mm (3.6 in)
1944
68.0 mm (2.7 in)
1945
90.7 mm (3.6 in)
1946
98.0 mm (3.9 in)
1947
88.7 mm (3.5 in)
1948
91.5 mm (3.6 in)
1949
82.5 mm (3.2 in)
1950
79.3 mm (3.1 in)
1951
49.8 mm (2.0 in)
1952
82.4 mm (3.2 in)
1953
46.2 mm (1.8 in)
1954
126.5 mm (5.0 in)
1955
67.6 mm (2.7 in)
1956
85.6 mm (3.4 in)
1957
85.8 mm (3.4 in)
1958
62.8 mm (2.5 in)
1959
82.4 mm (3.2 in)
1960
67.9 mm (2.7 in)
1961
82.8 mm (3.3 in)
1962
52.9 mm (2.1 in)
1963
46.6 mm (1.8 in)
1964
93.4 mm (3.7 in)
1965
60.5 mm (2.4 in)
1966
88.9 mm (3.5 in)
1967
62.2 mm (2.4 in)
1968
101.1 mm (4.0 in)
1969
58.4 mm (2.3 in)
1970
61.1 mm (2.4 in)
1971
64.7 mm (2.5 in)
1972
69.7 mm (2.7 in)
1973
73.2 mm (2.9 in)
1974
55.6 mm (2.2 in)
1975
80.3 mm (3.2 in)
1976
81.8 mm (3.2 in)
1977
80.4 mm (3.2 in)
1978
63.7 mm (2.5 in)
1979
84.1 mm (3.3 in)
1980
65.9 mm (2.6 in)
1981
68.6 mm (2.7 in)
1982
71.4 mm (2.8 in)
1983
91.8 mm (3.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at London Int'l Airport, 1940 to 1983. The record is 30 days in 1963, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at London Int'l Airport by year
Year
Longest dry spell (CDD)
1940
13 days
1941
13 days
1942
15 days
1943
19 days
1944
19 days
1945
14 days
1946
12 days
1947
16 days
1948
12 days
1949
22 days
1950
15 days
1951
10 days
1952
14 days
1953
20 days
1954
17 days
1955
18 days
1956
13 days
1957
22 days
1958
22 days
1959
14 days
1960
14 days
1961
16 days
1962
22 days
1963
30 days
1964
20 days
1965
14 days
1966
19 days
1967
21 days
1968
10 days
1969
27 days
1970
16 days
1971
15 days
1972
11 days
1973
27 days
1974
15 days
1975
17 days
1976
15 days
1977
10 days
1978
22 days
1979
16 days
1980
15 days
1981
11 days
1982
12 days
1983
16 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at London Int'l Airport falls on 9 May and the median first autumn frost on 8 October, which leaves a median of 153 days between them.
Fitted over all years, the growing season changes by +0.2 days per decade at this station.
Frost dates and growing season at London Int'l Airport
Measure
Median, all years
Earliest period
Recent period (1953 to 1983)
Recent against earliest
Fitted trend
Last spring frost
9 May
n/a
9 May
n/a
+0.9 days per decade
First autumn frost
8 October
n/a
8 October
n/a
+1.1 days per decade
Growing days
153 days
n/a
151 days
n/a
+0.2 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
43 years, 1941 to 1983
A day with at least 44.4 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 81.3 mm (3.2 in) of rain is expected about once in 100 years.
Rainfall return levels at London Int'l Airport: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.4 mm (1.7 in)
5 years
54.6 mm (2.1 in)
10 years
61.2 mm (2.4 in)
25 years
69.5 mm (2.7 in)
50 years
75.4 mm (3.0 in)
Longer than the 43 years of record
100 years
81.3 mm (3.2 in)
Longer than the 43 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, 43 years of values from 1941 to 1983.
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: 82.6 mm (3.3 in) in 1968; 81.8 mm (3.2 in) in 1946; 63.0 mm (2.5 in) in 1942.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for London Int'l Airport standing records by year: CSV or JSON. Field meanings are on the data page.
Data for London Int'l Airport 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.