La Mesa Threshold Days by Year (USC00044735)
12 fixed thresholds counted per year at La Mesa (USC00044735): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for La Mesa Thresholds
- La Mesa: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1941 with 25.
- La Mesa: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 1952 with 7.
- La Mesa: days with a maximum temperature at or above 30 C (86 F) in 48 years, most in 1938 with 110.
- La Mesa: days with a maximum temperature at or above 35 C (95 F) in 48 years, most in 1937 with 26.
- 12 fixed thresholds have at least one qualifying day at La Mesa.
Days at or above 30 C (86 F)
48 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1935 | 61 | 86.8 |
| 1936 | 101 | 86.8 |
| 1937 | 96 | 86.8 |
| 1938 | 110 | 86.8 |
| 1939 | 66 | 86.8 |
| 1940 | 50 | 40.3 |
| 1941 | 46 | 40.3 |
| 1942 | 40 | 40.3 |
| 1943 | 65 | 40.3 |
| 1944 | 24 | 40.3 |
| 1945 | 37 | 40.3 |
| 1947 | 45 | 40.3 |
| 1948 | 27 | 40.3 |
| 1949 | 29 | 40.3 |
| 1950 | 23 | 33.3 |
| 1951 | 21 | 33.3 |
| 1952 | 34 | 33.3 |
| 1953 | 28 | 33.3 |
| 1954 | 29 | 33.3 |
| 1955 | 36 | 33.3 |
| 1956 | 34 | 33.3 |
| 1957 | 37 | 33.3 |
| 1958 | 50 | 33.3 |
| 1959 | 41 | 33.3 |
| 1960 | 61 | 43.6 |
| 1961 | 41 | 43.6 |
| 1962 | 29 | 43.6 |
| 1963 | 29 | 43.6 |
| 1964 | 34 | 43.6 |
| 1965 | 42 | 43.6 |
| 1967 | 54 | 43.6 |
| 1968 | 52 | 43.6 |
| 1969 | 50 | 43.6 |
| 1970 | 56 | 52.4 |
| 1971 | 68 | 52.4 |
| 1972 | 48 | 52.4 |
| 1973 | 31 | 52.4 |
| 1974 | 41 | 52.4 |
| 1975 | 40 | 52.4 |
| 1976 | 51 | 52.4 |
| 1977 | 48 | 52.4 |
| 1978 | 72 | 52.4 |
| 1979 | 69 | 52.4 |
| 1981 | 76 | 60 |
| 1982 | 53 | 60 |
| 1983 | 65 | 60 |
| 1989 | 46 | 60 |
| 1994 | 48 | 48 |
| Year | First date | Last date |
|---|---|---|
| 1935 | 1935-01-31 | 1935-11-29 |
| 1936 | 1936-03-11 | 1936-11-25 |
| 1937 | 1937-03-03 | 1937-12-06 |
| 1938 | 1938-01-12 | 1938-12-09 |
| 1939 | 1939-04-06 | 1939-12-15 |
| 1940 | 1940-04-11 | 1940-12-07 |
| 1941 | 1941-05-07 | 1941-11-11 |
| 1942 | 1942-05-20 | 1942-11-12 |
| 1943 | 1943-02-13 | 1943-11-16 |
| 1944 | 1944-05-04 | 1944-10-03 |
| 1945 | 1945-05-16 | 1945-11-03 |
| 1947 | 1947-02-14 | 1947-10-31 |
| 1948 | 1948-01-10 | 1948-10-09 |
| 1949 | 1949-04-12 | 1949-11-19 |
| 1950 | 1950-06-29 | 1950-11-23 |
| 1951 | 1951-06-03 | 1951-10-10 |
| 1952 | 1952-07-10 | 1952-11-05 |
| 1953 | 1953-05-05 | 1953-11-26 |
| 1954 | 1954-02-25 | 1954-11-20 |
| 1955 | 1955-04-12 | 1955-11-07 |
| 1956 | 1956-05-14 | 1956-11-10 |
| 1957 | 1957-06-02 | 1957-12-09 |
| 1958 | 1958-04-14 | 1958-12-14 |
| 1959 | 1959-03-11 | 1959-12-02 |
| 1960 | 1960-03-19 | 1960-10-21 |
| 1961 | 1961-01-16 | 1961-11-05 |
| 1962 | 1962-04-06 | 1962-10-31 |
| 1963 | 1963-02-03 | 1963-11-11 |
| 1964 | 1964-04-13 | 1964-11-30 |
| 1965 | 1965-01-17 | 1965-12-05 |
| 1967 | 1967-05-14 | 1967-11-13 |
| 1968 | 1968-02-24 | 1968-11-20 |
| 1969 | 1969-01-05 | 1969-11-02 |
| 1970 | 1970-02-07 | 1970-11-01 |
| 1971 | 1971-01-18 | 1971-11-04 |
| 1972 | 1972-05-13 | 1972-10-06 |
| 1973 | 1973-05-28 | 1973-11-11 |
| 1974 | 1974-05-25 | 1974-11-12 |
| 1975 | 1975-01-19 | 1975-11-24 |
| 1976 | 1976-01-16 | 1976-11-08 |
| 1977 | 1977-02-12 | 1977-11-26 |
| 1978 | 1978-03-16 | 1978-11-08 |
| 1979 | 1979-03-06 | 1979-12-06 |
| 1981 | 1981-02-18 | 1981-11-02 |
| 1982 | 1982-04-20 | 1982-11-04 |
| 1983 | 1983-05-11 | 1983-11-03 |
| 1989 | 1989-02-22 | 1989-12-23 |
| 1994 | 1994-03-13 | 1994-10-12 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 48 | 110 | 1938 | 48 |
| 35 C (95 F): Days | 48 | 26 | 1937 | 8 |
| 40 C (104 F): Days | 18 | 4 | 1963 | 1 |
| 90 F (32.2 C): Days | 48 | 72 | 1938 | 25 |
| 100 F (37.8 C): Days | 36 | 8 | 1979 | 3 |
| 0 C (32 F): Frost days (min | 26 | 19 | 1948 | 4 |
| 20 C (68 F): Tropical nights (min | 43 | 16 | 1983 | 16 |
| 25 C (77 F): Days with min | 6 | 1 | 1935 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 64 | 25 | 1941 | 4 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 57 | 7 | 1952 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 22 | 2 | 1938 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1937 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.
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 (2025-12-31).