Stephenson 5WSW Threshold Days by Year (USC00207867)
17 fixed thresholds counted per year at Stephenson 5WSW (USC00207867): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Stephenson 5WSW Thresholds
- Stephenson 5WSW: days with 10 mm (0.39 in) or more of precipitation in 58 years, most in 1977 with 42.
- Stephenson 5WSW: days with 25 mm (0.98 in) or more of precipitation in 58 years, most in 1959 with 12.
- Stephenson 5WSW: days with 10 cm (3.9 in) or more of snowfall in 58 years, most in 1972 with 9.
- Stephenson 5WSW: days with a maximum temperature at or above 30 C (86 F) in 53 years, most in 1955 with 39.
- 17 fixed thresholds have at least one qualifying day at Stephenson 5WSW.
Days at or above 30 C (86 F)
53 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1949 | 24 | 24 |
| 1950 | 8 | 14.2 |
| 1951 | 4 | 14.2 |
| 1952 | 17 | 14.2 |
| 1953 | 17 | 14.2 |
| 1954 | 11 | 14.2 |
| 1955 | 39 | 14.2 |
| 1956 | 6 | 14.2 |
| 1957 | 16 | 14.2 |
| 1958 | 6 | 14.2 |
| 1959 | 18 | 14.2 |
| 1960 | 12 | 15.8 |
| 1961 | 13 | 15.8 |
| 1962 | 9 | 15.8 |
| 1963 | 22 | 15.8 |
| 1964 | 26 | 15.8 |
| 1965 | 9 | 15.8 |
| 1966 | 29 | 15.8 |
| 1967 | 4 | 15.8 |
| 1968 | 15 | 15.8 |
| 1969 | 19 | 15.8 |
| 1970 | 22 | 18.1 |
| 1971 | 14 | 18.1 |
| 1972 | 14 | 18.1 |
| 1973 | 19 | 18.1 |
| 1974 | 7 | 18.1 |
| 1975 | 28 | 18.1 |
| 1976 | 29 | 18.1 |
| 1977 | 20 | 18.1 |
| 1978 | 13 | 18.1 |
| 1979 | 15 | 18.1 |
| 1980 | 19 | 16.4 |
| 1981 | 12 | 16.4 |
| 1982 | 9 | 16.4 |
| 1985 | 4 | 16.4 |
| 1986 | 11 | 16.4 |
| 1987 | 25 | 16.4 |
| 1988 | 36 | 16.4 |
| 1989 | 15 | 16.4 |
| 1990 | 12 | 12.8 |
| 1991 | 25 | 12.8 |
| 1992 | 6 | 12.8 |
| 1993 | 5 | 12.8 |
| 1994 | 8 | 12.8 |
| 1995 | 15 | 12.8 |
| 1996 | 6 | 12.8 |
| 1997 | 13 | 12.8 |
| 1999 | 25 | 12.8 |
| 2000 | 12 | 18 |
| 2001 | 25 | 18 |
| 2002 | 28 | 18 |
| 2003 | 20 | 18 |
| 2004 | 5 | 18 |
| Year | First date | Last date |
|---|---|---|
| 1949 | 1949-05-03 | 1949-08-26 |
| 1950 | 1950-06-07 | 1950-08-15 |
| 1951 | 1951-07-24 | 1951-07-29 |
| 1952 | 1952-04-27 | 1952-09-13 |
| 1953 | 1953-05-09 | 1953-09-03 |
| 1954 | 1954-06-13 | 1954-08-24 |
| 1955 | 1955-05-03 | 1955-09-18 |
| 1956 | 1956-06-09 | 1956-06-14 |
| 1957 | 1957-06-11 | 1957-08-10 |
| 1958 | 1958-06-29 | 1958-08-09 |
| 1959 | 1959-05-02 | 1959-09-09 |
| 1960 | 1960-06-27 | 1960-09-07 |
| 1961 | 1961-06-28 | 1961-09-10 |
| 1962 | 1962-04-26 | 1962-08-28 |
| 1963 | 1963-06-03 | 1963-10-06 |
| 1964 | 1964-05-22 | 1964-08-03 |
| 1965 | 1965-06-20 | 1965-08-15 |
| 1966 | 1966-06-20 | 1966-09-01 |
| 1967 | 1967-06-14 | 1967-08-17 |
| 1968 | 1968-06-05 | 1968-08-24 |
| 1969 | 1969-05-28 | 1969-08-31 |
| 1970 | 1970-05-21 | 1970-08-27 |
| 1971 | 1971-06-04 | 1971-09-03 |
| 1972 | 1972-05-19 | 1972-08-21 |
| 1973 | 1973-06-10 | 1973-09-03 |
| 1974 | 1974-07-01 | 1974-07-19 |
| 1975 | 1975-05-19 | 1975-08-21 |
| 1976 | 1976-06-07 | 1976-09-11 |
| 1977 | 1977-05-12 | 1977-08-28 |
| 1978 | 1978-05-26 | 1978-09-06 |
| 1979 | 1979-06-15 | 1979-08-07 |
| 1980 | 1980-04-22 | 1980-08-07 |
| 1981 | 1981-07-05 | 1981-09-11 |
| 1982 | 1982-05-11 | 1982-08-16 |
| 1985 | 1985-04-21 | 1985-07-20 |
| 1986 | 1986-05-29 | 1986-07-25 |
| 1987 | 1987-05-17 | 1987-09-06 |
| 1988 | 1988-05-30 | 1988-08-17 |
| 1989 | 1989-07-03 | 1989-08-06 |
| 1990 | 1990-04-25 | 1990-09-02 |
| 1991 | 1991-05-12 | 1991-08-31 |
| 1992 | 1992-05-02 | 1992-10-03 |
| 1993 | 1993-06-22 | 1993-08-26 |
| 1994 | 1994-05-21 | 1994-08-26 |
| 1995 | 1995-06-18 | 1995-09-06 |
| 1996 | 1996-05-19 | 1996-08-07 |
| 1997 | 1997-06-11 | 1997-08-08 |
| 1999 | 1999-05-29 | 1999-09-05 |
| 2000 | 2000-05-05 | 2000-09-01 |
| 2001 | 2001-06-15 | 2001-08-10 |
| 2002 | 2002-04-17 | 2002-09-10 |
| 2003 | 2003-04-15 | 2003-08-27 |
| 2004 | 2004-06-09 | 2004-07-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 53 | 39 | 1955 | 5 |
| 35 C (95 F): Days | 19 | 8 | 1988 | 1 |
| 90 F (32.2 C): Days | 47 | 21 | 1988 | 2 |
| 100 F (37.8 C): Days | 1 | 1 | 1955 | 1 |
| 0 C (32 F): Ice days (max | 53 | 98 | 1955 | 63 |
| 0 C (32 F): Frost days (min | 52 | 205 | 2002 | 191 |
| -10 C (14 F): Days with min | 52 | 105 | 1989 | 75 |
| -20 C (-4 F): Days with min | 52 | 53 | 1985 | 31 |
| -30 C (-22 F): Days with min | 29 | 12 | 1994 | 2 |
| -40 C (-40 F): Days with min | 1 | 3 | 1996 | 3 |
| 20 C (68 F): Tropical nights (min | 38 | 10 | 1955 | 3 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 58 | 42 | 1977 | 26 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 58 | 12 | 1959 | 5 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 25 | 3 | 1960 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1968 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 58 | 9 | 1972 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 14 | 2 | 1988 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.
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).