Seattle Urban Site Threshold Days by Year (USW00024281)
15 fixed thresholds counted per year at Seattle Urban Site (USW00024281): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Seattle Urban Site Thresholds
- Seattle Urban Site: nights with a minimum temperature at or below 0 C (32 F) in 103 years, most in 1985 with 61.
- Seattle Urban Site: days with 10 mm (0.39 in) or more of precipitation in 103 years, most in 1968 with 43.
- Seattle Urban Site: days with 25 mm (0.98 in) or more of precipitation in 99 years, most in 1975 with 11.
- Seattle Urban Site: days with a maximum temperature at or above 30 C (86 F) in 93 years, most in 1967 with 18.
- 15 fixed thresholds have at least one qualifying day at Seattle Urban Site.
Days at or above 30 C (86 F)
93 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1894 | 2 | 5.5 |
| 1895 | 5 | 5.5 |
| 1896 | 5 | 5.5 |
| 1897 | 5 | 5.5 |
| 1898 | 13 | 5.5 |
| 1899 | 3 | 5.5 |
| 1900 | 1 | 2.4 |
| 1901 | 4 | 2.4 |
| 1902 | 3 | 2.4 |
| 1903 | 1 | 2.4 |
| 1904 | 4 | 2.4 |
| 1905 | 1 | 2.4 |
| 1906 | 4 | 2.4 |
| 1907 | 2 | 2.4 |
| 1908 | 2 | 2.4 |
| 1910 | 2 | 3.6 |
| 1911 | 6 | 3.6 |
| 1912 | 4 | 3.6 |
| 1913 | 6 | 3.6 |
| 1914 | 3 | 3.6 |
| 1915 | 5 | 3.6 |
| 1916 | 2 | 3.6 |
| 1919 | 1 | 3.6 |
| 1920 | 2 | 4.1 |
| 1922 | 3 | 4.1 |
| 1923 | 2 | 4.1 |
| 1924 | 4 | 4.1 |
| 1925 | 1 | 4.1 |
| 1926 | 7 | 4.1 |
| 1927 | 9 | 4.1 |
| 1928 | 5 | 4.1 |
| 1930 | 3 | 5.4 |
| 1931 | 4 | 5.4 |
| 1932 | 3 | 5.4 |
| 1933 | 6 | 5.4 |
| 1934 | 5 | 5.4 |
| 1935 | 9 | 5.4 |
| 1936 | 1 | 5.4 |
| 1937 | 3 | 5.4 |
| 1938 | 8 | 5.4 |
| 1939 | 12 | 5.4 |
| 1940 | 7 | 4.9 |
| 1941 | 8 | 4.9 |
| 1942 | 10 | 4.9 |
| 1943 | 1 | 4.9 |
| 1944 | 6 | 4.9 |
| 1946 | 4 | 4.9 |
| 1947 | 3 | 4.9 |
| 1948 | 2 | 4.9 |
| 1949 | 3 | 4.9 |
| 1950 | 3 | 8 |
| 1951 | 10 | 8 |
| 1952 | 7 | 8 |
| 1953 | 5 | 8 |
| 1955 | 5 | 8 |
| 1956 | 6 | 8 |
| 1958 | 17 | 8 |
| 1959 | 11 | 8 |
| 1960 | 10 | 8.4 |
| 1961 | 14 | 8.4 |
| 1962 | 7 | 8.4 |
| 1963 | 5 | 8.4 |
| 1964 | 3 | 8.4 |
| 1965 | 9 | 8.4 |
| 1966 | 2 | 8.4 |
| 1967 | 18 | 8.4 |
| 1968 | 10 | 8.4 |
| 1969 | 6 | 8.4 |
| 1970 | 5 | 5.6 |
| 1971 | 11 | 5.6 |
| 1972 | 8 | 5.6 |
| 1973 | 2 | 5.6 |
| 1974 | 6 | 5.6 |
| 1975 | 2 | 5.6 |
| 1977 | 7 | 5.6 |
| 1978 | 6 | 5.6 |
| 1979 | 3 | 5.6 |
| 1981 | 6 | 4.5 |
| 1982 | 2 | 4.5 |
| 1984 | 2 | 4.5 |
| 1985 | 7 | 4.5 |
| 1986 | 8 | 4.5 |
| 1987 | 3 | 4.5 |
| 1988 | 6 | 4.5 |
| 1989 | 2 | 4.5 |
| 1990 | 6 | 7.1 |
| 1991 | 2 | 7.1 |
| 1992 | 13 | 7.1 |
| 1993 | 5 | 7.1 |
| 1994 | 6 | 7.1 |
| 1995 | 7 | 7.1 |
| 1996 | 10 | 7.1 |
| 1997 | 8 | 7.1 |
| Year | First date | Last date |
|---|---|---|
| 1894 | 1894-07-13 | 1894-08-02 |
| 1895 | 1895-05-15 | 1895-07-10 |
| 1896 | 1896-06-26 | 1896-08-22 |
| 1897 | 1897-05-28 | 1897-08-16 |
| 1898 | 1898-05-25 | 1898-09-07 |
| 1899 | 1899-07-26 | 1899-07-28 |
| 1900 | 1900-06-12 | 1900-06-12 |
| 1901 | 1901-06-18 | 1901-09-19 |
| 1902 | 1902-07-19 | 1902-08-10 |
| 1903 | 1903-06-08 | 1903-06-08 |
| 1904 | 1904-07-10 | 1904-08-04 |
| 1905 | 1905-07-08 | 1905-07-08 |
| 1906 | 1906-07-02 | 1906-07-14 |
| 1907 | 1907-07-20 | 1907-07-30 |
| 1908 | 1908-07-20 | 1908-08-18 |
| 1910 | 1910-07-10 | 1910-07-11 |
| 1911 | 1911-07-14 | 1911-07-24 |
| 1912 | 1912-05-13 | 1912-07-18 |
| 1913 | 1913-07-19 | 1913-08-21 |
| 1914 | 1914-06-15 | 1914-08-13 |
| 1915 | 1915-06-30 | 1915-08-21 |
| 1916 | 1916-08-24 | 1916-08-25 |
| 1919 | 1919-08-16 | 1919-08-16 |
| 1920 | 1920-07-07 | 1920-08-13 |
| 1922 | 1922-05-30 | 1922-07-03 |
| 1923 | 1923-07-14 | 1923-08-16 |
| 1924 | 1924-06-29 | 1924-09-12 |
| 1925 | 1925-06-25 | 1925-06-25 |
| 1926 | 1926-05-12 | 1926-08-23 |
| 1927 | 1927-07-16 | 1927-08-17 |
| 1928 | 1928-07-22 | 1928-07-26 |
| 1930 | 1930-06-15 | 1930-08-11 |
| 1931 | 1931-06-06 | 1931-08-09 |
| 1932 | 1932-06-10 | 1932-08-05 |
| 1933 | 1933-07-15 | 1933-08-26 |
| 1934 | 1934-05-13 | 1934-09-02 |
| 1935 | 1935-06-06 | 1935-08-28 |
| 1936 | 1936-08-28 | 1936-08-28 |
| 1937 | 1937-06-27 | 1937-09-14 |
| 1938 | 1938-07-13 | 1938-09-14 |
| 1939 | 1939-05-13 | 1939-08-21 |
| 1940 | 1940-06-24 | 1940-08-18 |
| 1941 | 1941-06-11 | 1941-08-19 |
| 1942 | 1942-06-30 | 1942-08-22 |
| 1943 | 1943-09-08 | 1943-09-08 |
| 1944 | 1944-05-27 | 1944-09-05 |
| 1946 | 1946-07-20 | 1946-08-22 |
| 1947 | 1947-04-26 | 1947-05-25 |
| 1948 | 1948-06-07 | 1948-07-31 |
| 1949 | 1949-07-31 | 1949-09-06 |
| 1950 | 1950-07-21 | 1950-08-26 |
| 1951 | 1951-06-21 | 1951-09-15 |
| 1952 | 1952-07-08 | 1952-09-21 |
| 1953 | 1953-05-05 | 1953-09-04 |
| 1955 | 1955-06-08 | 1955-09-05 |
| 1956 | 1956-05-30 | 1956-08-18 |
| 1958 | 1958-05-18 | 1958-08-24 |
| 1959 | 1959-05-12 | 1959-07-31 |
| 1960 | 1960-07-06 | 1960-08-09 |
| 1961 | 1961-05-19 | 1961-09-13 |
| 1962 | 1962-07-22 | 1962-08-15 |
| 1963 | 1963-05-19 | 1963-09-09 |
| 1964 | 1964-05-31 | 1964-08-11 |
| 1965 | 1965-06-30 | 1965-08-18 |
| 1966 | 1966-08-20 | 1966-08-21 |
| 1967 | 1967-06-17 | 1967-09-27 |
| 1968 | 1968-07-01 | 1968-08-09 |
| 1969 | 1969-05-22 | 1969-07-23 |
| 1970 | 1970-06-01 | 1970-07-18 |
| 1971 | 1971-05-11 | 1971-08-11 |
| 1972 | 1972-05-27 | 1972-08-08 |
| 1973 | 1973-05-14 | 1973-09-05 |
| 1974 | 1974-07-29 | 1974-09-02 |
| 1975 | 1975-06-01 | 1975-07-04 |
| 1977 | 1977-08-09 | 1977-08-17 |
| 1978 | 1978-06-05 | 1978-08-08 |
| 1979 | 1979-07-16 | 1979-09-14 |
| 1981 | 1981-08-06 | 1981-08-11 |
| 1982 | 1982-06-18 | 1982-06-19 |
| 1984 | 1984-07-23 | 1984-07-24 |
| 1985 | 1985-06-18 | 1985-07-29 |
| 1986 | 1986-06-13 | 1986-09-06 |
| 1987 | 1987-06-29 | 1987-09-01 |
| 1988 | 1988-07-19 | 1988-09-03 |
| 1989 | 1989-06-04 | 1989-06-24 |
| 1990 | 1990-07-12 | 1990-08-11 |
| 1991 | 1991-07-02 | 1991-07-23 |
| 1992 | 1992-06-21 | 1992-08-13 |
| 1993 | 1993-05-24 | 1993-08-05 |
| 1994 | 1994-07-20 | 1994-08-27 |
| 1995 | 1995-06-28 | 1995-07-19 |
| 1996 | 1996-07-13 | 1996-08-29 |
| 1997 | 1997-07-04 | 1997-08-17 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 93 | 18 | 1967 | 8 |
| 35 C (95 F): Days | 13 | 4 | 1942 | 1 |
| 90 F (32.2 C): Days | 62 | 7 | 1942 | 1 |
| 100 F (37.8 C): Days | 2 | 1 | 1941 | 1 |
| 0 C (32 F): Ice days (max | 58 | 18 | 1950 | 1 |
| 0 C (32 F): Frost days (min | 103 | 61 | 1985 | 18 |
| -10 C (14 F): Days with min | 17 | 6 | 1950 | 4 |
| 20 C (68 F): Tropical nights (min | 4 | 2 | 1941 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 103 | 43 | 1968 | 38 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 99 | 11 | 1975 | 6 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 29 | 3 | 1996 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1986 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 41 | 3 | 1899 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 7 | 1 | 1896 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1916 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.
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).