London Int'l Airport Threshold Days by Year (CA006144475)
16 fixed thresholds counted per year at London Int'l Airport (CA006144475): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for London Int'l Airport Thresholds
- London Int'l Airport: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1955 with 39.
- London Int'l Airport: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1960 with 92.
- London Int'l Airport: nights with a minimum temperature at or below 0 C (32 F) in 43 years, most in 1974 with 174.
- London Int'l Airport: nights with a minimum temperature at or below -10 C (14 F) in 43 years, most in 1978 with 75.
- 16 fixed thresholds have at least one qualifying day at London Int'l Airport.
Days at or above 30 C (86 F)
43 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1941 | 29 | 17 |
| 1942 | 9 | 17 |
| 1943 | 14 | 17 |
| 1944 | 25 | 17 |
| 1945 | 6 | 17 |
| 1946 | 11 | 17 |
| 1947 | 17 | 17 |
| 1948 | 14 | 17 |
| 1949 | 28 | 17 |
| 1950 | 4 | 15.2 |
| 1951 | 5 | 15.2 |
| 1952 | 27 | 15.2 |
| 1953 | 18 | 15.2 |
| 1954 | 15 | 15.2 |
| 1955 | 39 | 15.2 |
| 1956 | 6 | 15.2 |
| 1957 | 12 | 15.2 |
| 1958 | 4 | 15.2 |
| 1959 | 22 | 15.2 |
| 1960 | 5 | 12.9 |
| 1961 | 8 | 12.9 |
| 1962 | 14 | 12.9 |
| 1963 | 19 | 12.9 |
| 1964 | 26 | 12.9 |
| 1965 | 8 | 12.9 |
| 1966 | 14 | 12.9 |
| 1967 | 3 | 12.9 |
| 1968 | 13 | 12.9 |
| 1969 | 19 | 12.9 |
| 1970 | 11 | 9.6 |
| 1971 | 16 | 9.6 |
| 1972 | 5 | 9.6 |
| 1973 | 17 | 9.6 |
| 1974 | 9 | 9.6 |
| 1975 | 10 | 9.6 |
| 1976 | 6 | 9.6 |
| 1977 | 9 | 9.6 |
| 1978 | 10 | 9.6 |
| 1979 | 3 | 9.6 |
| 1980 | 5 | 6.5 |
| 1981 | 6 | 6.5 |
| 1982 | 3 | 6.5 |
| 1983 | 12 | 6.5 |
| Year | First date | Last date |
|---|---|---|
| 1941 | 1941-05-21 | 1941-09-22 |
| 1942 | 1942-05-30 | 1942-08-22 |
| 1943 | 1943-06-15 | 1943-09-01 |
| 1944 | 1944-05-31 | 1944-08-16 |
| 1945 | 1945-06-24 | 1945-09-07 |
| 1946 | 1946-06-24 | 1946-10-06 |
| 1947 | 1947-06-29 | 1947-08-25 |
| 1948 | 1948-06-04 | 1948-09-17 |
| 1949 | 1949-05-05 | 1949-08-27 |
| 1950 | 1950-06-25 | 1950-08-28 |
| 1951 | 1951-07-26 | 1951-08-31 |
| 1952 | 1952-06-06 | 1952-09-14 |
| 1953 | 1953-06-20 | 1953-09-04 |
| 1954 | 1954-06-10 | 1954-09-05 |
| 1955 | 1955-06-05 | 1955-09-19 |
| 1956 | 1956-06-11 | 1956-07-27 |
| 1957 | 1957-06-17 | 1957-09-02 |
| 1958 | 1958-06-30 | 1958-08-12 |
| 1959 | 1959-06-08 | 1959-09-09 |
| 1960 | 1960-07-09 | 1960-09-08 |
| 1961 | 1961-06-12 | 1961-09-11 |
| 1962 | 1962-05-14 | 1962-08-30 |
| 1963 | 1963-06-06 | 1963-08-22 |
| 1964 | 1964-05-19 | 1964-09-10 |
| 1965 | 1965-06-06 | 1965-09-19 |
| 1966 | 1966-06-23 | 1966-07-25 |
| 1967 | 1967-06-12 | 1967-06-16 |
| 1968 | 1968-06-07 | 1968-08-24 |
| 1969 | 1969-05-28 | 1969-09-06 |
| 1970 | 1970-06-11 | 1970-08-30 |
| 1971 | 1971-06-19 | 1971-09-08 |
| 1972 | 1972-07-12 | 1972-07-23 |
| 1973 | 1973-06-11 | 1973-09-04 |
| 1974 | 1974-07-03 | 1974-08-21 |
| 1975 | 1975-06-22 | 1975-08-02 |
| 1976 | 1976-06-10 | 1976-09-08 |
| 1977 | 1977-05-17 | 1977-09-01 |
| 1978 | 1978-06-27 | 1978-09-11 |
| 1979 | 1979-07-13 | 1979-07-15 |
| 1980 | 1980-06-26 | 1980-08-27 |
| 1981 | 1981-06-15 | 1981-07-13 |
| 1982 | 1982-07-07 | 1982-07-25 |
| 1983 | 1983-06-13 | 1983-09-10 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 43 | 39 | 1955 | 12 |
| 35 C (95 F): Days | 9 | 3 | 1955 | 1 |
| 90 F (32.2 C): Days | 32 | 22 | 1955 | 5 |
| 0 C (32 F): Ice days (max | 43 | 92 | 1960 | 55 |
| 0 C (32 F): Frost days (min | 43 | 174 | 1974 | 145 |
| -10 C (14 F): Days with min | 43 | 75 | 1978 | 35 |
| -20 C (-4 F): Days with min | 40 | 22 | 1963 | 2 |
| -30 C (-22 F): Days with min | 2 | 2 | 1970 | 1 |
| 20 C (68 F): Tropical nights (min | 40 | 18 | 1955 | 9 |
| 25 C (77 F): Days with min | 2 | 1 | 1944 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 43 | 42 | 1951 | 33 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 42 | 9 | 1942 | 8 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 13 | 2 | 1942 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 40 | 10 | 1951 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 9 | 1 | 1943 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1977 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.
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). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-17).