Heidelberg Threshold Days by Year (USC00153741)
18 fixed thresholds counted per year at Heidelberg (USC00153741): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Heidelberg Thresholds
- Heidelberg: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1935 with 54.
- Heidelberg: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1935 with 19.
- Heidelberg: days with a maximum temperature at or above 30 C (86 F) in 60 years, most in 1941 with 117.
- Heidelberg: days with a maximum temperature at or above 90 F (32.2 C) in 60 years, most in 1936 with 77.
- 18 fixed thresholds have at least one qualifying day at Heidelberg.
Days at or above 30 C (86 F)
60 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1934 | 95 | 87.2 |
| 1935 | 67 | 87.2 |
| 1936 | 109 | 87.2 |
| 1937 | 84 | 87.2 |
| 1938 | 73 | 87.2 |
| 1939 | 95 | 87.2 |
| 1940 | 78 | 76.1 |
| 1941 | 117 | 76.1 |
| 1942 | 67 | 76.1 |
| 1943 | 89 | 76.1 |
| 1944 | 94 | 76.1 |
| 1945 | 75 | 76.1 |
| 1946 | 39 | 76.1 |
| 1947 | 60 | 76.1 |
| 1948 | 73 | 76.1 |
| 1949 | 69 | 76.1 |
| 1950 | 26 | 83.9 |
| 1951 | 63 | 83.9 |
| 1952 | 90 | 83.9 |
| 1953 | 112 | 83.9 |
| 1954 | 110 | 83.9 |
| 1955 | 97 | 83.9 |
| 1956 | 89 | 83.9 |
| 1957 | 91 | 83.9 |
| 1958 | 65 | 83.9 |
| 1959 | 96 | 83.9 |
| 1960 | 79 | 72.8 |
| 1961 | 71 | 72.8 |
| 1962 | 88 | 72.8 |
| 1963 | 59 | 72.8 |
| 1964 | 86 | 72.8 |
| 1965 | 79 | 72.8 |
| 1966 | 74 | 72.8 |
| 1967 | 47 | 72.8 |
| 1968 | 60 | 72.8 |
| 1969 | 85 | 72.8 |
| 1970 | 76 | 56.7 |
| 1971 | 60 | 56.7 |
| 1972 | 47 | 56.7 |
| 1973 | 58 | 56.7 |
| 1974 | 40 | 56.7 |
| 1975 | 71 | 56.7 |
| 1976 | 45 | 56.7 |
| 1983 | 87 | 78.9 |
| 1984 | 79 | 78.9 |
| 1985 | 52 | 78.9 |
| 1986 | 96 | 78.9 |
| 1987 | 96 | 78.9 |
| 1988 | 90 | 78.9 |
| 1989 | 52 | 78.9 |
| 1990 | 77 | 64.8 |
| 1991 | 74 | 64.8 |
| 1992 | 39 | 64.8 |
| 1993 | 75 | 64.8 |
| 1994 | 44 | 64.8 |
| 1995 | 62 | 64.8 |
| 1998 | 76 | 64.8 |
| 1999 | 71 | 64.8 |
| 2003 | 31 | 40.5 |
| 2006 | 50 | 40.5 |
| Year | First date | Last date |
|---|---|---|
| 1934 | 1934-04-03 | 1934-09-25 |
| 1935 | 1935-04-26 | 1935-09-21 |
| 1936 | 1936-04-15 | 1936-10-09 |
| 1937 | 1937-04-23 | 1937-10-06 |
| 1938 | 1938-04-26 | 1938-10-18 |
| 1939 | 1939-05-06 | 1939-10-10 |
| 1940 | 1940-04-15 | 1940-10-28 |
| 1941 | 1941-04-13 | 1941-10-09 |
| 1942 | 1942-04-27 | 1942-09-19 |
| 1943 | 1943-05-05 | 1943-09-15 |
| 1944 | 1944-04-22 | 1944-09-21 |
| 1945 | 1945-03-25 | 1945-09-28 |
| 1946 | 1946-04-02 | 1946-09-08 |
| 1947 | 1947-05-15 | 1947-09-21 |
| 1948 | 1948-04-23 | 1948-09-21 |
| 1949 | 1949-05-05 | 1949-10-11 |
| 1950 | 1950-04-24 | 1950-08-25 |
| 1951 | 1951-05-02 | 1951-10-05 |
| 1952 | 1952-04-21 | 1952-10-01 |
| 1953 | 1953-04-24 | 1953-10-19 |
| 1954 | 1954-04-07 | 1954-10-06 |
| 1955 | 1955-04-18 | 1955-09-29 |
| 1956 | 1956-04-27 | 1956-09-30 |
| 1957 | 1957-04-19 | 1957-09-22 |
| 1958 | 1958-05-03 | 1958-09-27 |
| 1959 | 1959-05-02 | 1959-10-06 |
| 1960 | 1960-04-22 | 1960-09-09 |
| 1961 | 1961-04-24 | 1961-09-25 |
| 1962 | 1962-04-30 | 1962-10-14 |
| 1963 | 1963-04-01 | 1963-09-12 |
| 1964 | 1964-04-20 | 1964-09-16 |
| 1965 | 1965-04-23 | 1965-09-23 |
| 1966 | 1966-05-08 | 1966-09-04 |
| 1967 | 1967-03-14 | 1967-10-03 |
| 1968 | 1968-06-05 | 1968-09-25 |
| 1969 | 1969-04-18 | 1969-10-14 |
| 1970 | 1970-04-20 | 1970-09-25 |
| 1971 | 1971-05-18 | 1971-10-01 |
| 1972 | 1972-05-25 | 1972-09-22 |
| 1973 | 1973-06-03 | 1973-10-05 |
| 1974 | 1974-04-01 | 1974-08-27 |
| 1975 | 1975-05-21 | 1975-10-15 |
| 1976 | 1976-04-17 | 1976-08-29 |
| 1983 | 1983-05-08 | 1983-10-05 |
| 1984 | 1984-04-27 | 1984-09-26 |
| 1985 | 1985-04-19 | 1985-09-11 |
| 1986 | 1986-04-01 | 1986-10-04 |
| 1987 | 1987-04-21 | 1987-09-28 |
| 1988 | 1988-04-06 | 1988-09-24 |
| 1989 | 1989-03-29 | 1989-09-10 |
| 1990 | 1990-03-13 | 1990-09-28 |
| 1991 | 1991-05-16 | 1991-10-27 |
| 1992 | 1992-04-21 | 1992-09-18 |
| 1993 | 1993-05-09 | 1993-09-15 |
| 1994 | 1994-05-24 | 1994-10-02 |
| 1995 | 1995-04-11 | 1995-09-15 |
| 1998 | 1998-05-15 | 1998-10-06 |
| 1999 | 1999-06-07 | 1999-09-29 |
| 2003 | 2003-06-25 | 2003-09-02 |
| 2006 | 2006-04-15 | 2006-08-29 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 60 | 117 | 1941 | 50 |
| 35 C (95 F): Days | 41 | 43 | 1936 | 5 |
| 40 C (104 F): Days | 2 | 3 | 1988 | 3 |
| 90 F (32.2 C): Days | 60 | 77 | 1936 | 27 |
| 100 F (37.8 C): Days | 7 | 18 | 1936 | 2 |
| 0 C (32 F): Ice days (max | 60 | 31 | 1985 | 6 |
| 0 C (32 F): Frost days (min | 59 | 161 | 1988 | 101 |
| -10 C (14 F): Days with min | 59 | 38 | 1958 | 5 |
| -20 C (-4 F): Days with min | 29 | 9 | 1963 | 6 |
| -30 C (-22 F): Days with min | 3 | 2 | 1994 | 2 |
| 20 C (68 F): Tropical nights (min | 58 | 43 | 1934 | 26 |
| 25 C (77 F): Days with min | 1 | 1 | 1934 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 66 | 54 | 1935 | 37 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 66 | 19 | 1935 | 10 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 57 | 7 | 1972 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 4 | 1 | 1960 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 25 | 6 | 1960 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 3 | 2 | 1985 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1934.
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).