London Int'l Airport Weather Records (CA006144475)
Record envelope, standing records and threshold days for London Int'l Airport (CA006144475), Ontario, Canada, with 78 years of record.
Key Facts for London Int'l Airport
- London Int'l Airport (CA006144475) is a weather station in Ontario, Canada at 43.03 latitude and -81.15 longitude, 278 m (912 ft) above sea level.
- The station reports from 1940 to 2017, 78 years of record.
- 1,464 records set at London Int'l Airport still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- London Int'l Airport set a daily record snowfall of 14.1 cm (5.6 in) on 28 December 1983.
About the Station
- Location: Ontario, Canada, 43.03 latitude, -81.15 longitude.
- Elevation: 278 m (912 ft).
- Period of record: 1940 to 2017, 78 years.
- Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record| 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 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| 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)| 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| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1940 | 163 | 45% | No |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 348 | 95% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 28 December 1983 | London Int'l Airport, CA | daily snowfall | 14.1 cm (5.6 in) | 4.7 cm (1.9 in) | 14 years | 18 of 100 (Routine) |
| 28 December 1983 | London Int'l Airport, CA | daily rain (Tie) | 13.7 mm (0.5 in) | tie | 14 years | 2 of 100 (Routine) |
| 26 December 1983 | London Int'l Airport, CA | daily low min | -21.6 C (-6.9 F) | 0.5 C (0.9 F) | 24 years | 11 of 100 (Routine) |
| 25 December 1983 | London Int'l Airport, CA | daily low max | -12.6 C (9.3 F) | 1.5 C (2.7 F) | 2 years | 6 of 100 (Routine) |
| 24 December 1983 | London Int'l Airport, CA | daily low max | -13.6 C (7.5 F) | 2.5 C (4.5 F) | 13 years | 12 of 100 (Routine) |
| 19 December 1983 | London Int'l Airport, CA | daily low max | -11.2 C (11.8 F) | 0.6 C (1.1 F) | 20 years | 11 of 100 (Routine) |
| 6 December 1983 | London Int'l Airport, CA | daily rain | 37.9 mm (1.5 in) | 6.1 mm (0.24 in) | 16 years | 19 of 100 (Routine) |
| 15 November 1983 | London Int'l Airport, CA | daily snowfall | 8.2 cm (3.2 in) | 4.9 cm (1.9 in) | 33 years | 24 of 100 (Routine) |
| 9 November 1983 | London Int'l Airport, CA | daily high max | 16.2 C (61.2 F) | 0.6 C (1.1 F) | 40 years | 17 of 100 (Routine) |
| 30 October 1983 | London Int'l Airport, CA | daily low min | -5.2 C (22.6 F) | 0.8 C (1.4 F) | 13 years | 9 of 100 (Routine) |
| 3 October 1983 | London Int'l Airport, CA | daily high min | 16.2 C (61.2 F) | 0.6 C (1.1 F) | 28 years | 13 of 100 (Routine) |
| 19 September 1983 | London Int'l Airport, CA | daily high min | 19.1 C (66.4 F) | 2.4 C (4.3 F) | 40 years | 20 of 100 (Routine) |
| 10 September 1983 | London Int'l Airport, CA | daily high min | 21.6 C (70.9 F) | 1.0 C (1.8 F) | 36 years | 16 of 100 (Routine) |
| 10 September 1983 | London Int'l Airport, CA | daily high max | 33.3 C (91.9 F) | 1.6 C (2.9 F) | 18 years | 12 of 100 (Routine) |
| 29 July 1983 | London Int'l Airport, CA | daily rain | 44.9 mm (1.8 in) | 7.1 mm (0.28 in) | 24 years | 18 of 100 (Routine) |
| 16 July 1983 | London Int'l Airport, CA | daily high min | 21.7 C (71.1 F) | 1.7 C (3.1 F) | 28 years | 16 of 100 (Routine) |
| 16 July 1983 | London Int'l Airport, CA | daily high max | 32.3 C (90.1 F) | 0.6 C (1.1 F) | 29 years | 13 of 100 (Routine) |
| 15 July 1983 | London Int'l Airport, CA | daily high min | 22.6 C (72.7 F) | 1.5 C (2.7 F) | 28 years | 16 of 100 (Routine) |
| 26 June 1983 | London Int'l Airport, CA | daily high max | 33.6 C (92.5 F) | 0.3 C (0.5 F) | 41 years | 16 of 100 (Routine) |
| 23 June 1983 | London Int'l Airport, CA | daily high max | 32.5 C (90.5 F) | 1.4 C (2.5 F) | 34 years | 17 of 100 (Routine) |
Climate Trend
42 complete years, 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.
| 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| 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)
| 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)
| 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)
| 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)
| 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)
| 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 frostAcross 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.
| 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 1983A 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.
| 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
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 (2026-10-17).