Grafton Threshold Days by Year (USC00303360)
16 fixed thresholds counted per year at Grafton (USC00303360): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Grafton Thresholds
- Grafton: nights with a minimum temperature at or below 0 C (32 F) in 52 years, most in 1978 with 175.
- Grafton: nights with a minimum temperature at or below -10 C (14 F) in 52 years, most in 1978 with 73.
- Grafton: nights with a minimum temperature at or below -20 C (-4 F) in 52 years, most in 1968 with 17.
- Grafton: days with 10 mm (0.39 in) or more of precipitation in 52 years, most in 1990 with 55.
- 16 fixed thresholds have at least one qualifying day at Grafton.
Days at or above 30 C (86 F)
47 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1951 | 1 | 7.3 |
| 1952 | 8 | 7.3 |
| 1953 | 15 | 7.3 |
| 1954 | 2 | 7.3 |
| 1955 | 18 | 7.3 |
| 1956 | 2 | 7.3 |
| 1957 | 3 | 7.3 |
| 1958 | 2 | 7.3 |
| 1959 | 15 | 7.3 |
| 1962 | 5 | 8.1 |
| 1963 | 11 | 8.1 |
| 1964 | 15 | 8.1 |
| 1965 | 10 | 8.1 |
| 1966 | 9 | 8.1 |
| 1967 | 3 | 8.1 |
| 1968 | 8 | 8.1 |
| 1969 | 4 | 8.1 |
| 1970 | 7 | 5.8 |
| 1971 | 2 | 5.8 |
| 1972 | 3 | 5.8 |
| 1973 | 14 | 5.8 |
| 1974 | 3 | 5.8 |
| 1975 | 8 | 5.8 |
| 1976 | 2 | 5.8 |
| 1977 | 7 | 5.8 |
| 1978 | 6 | 5.8 |
| 1979 | 6 | 5.8 |
| 1980 | 6 | 6.1 |
| 1981 | 1 | 6.1 |
| 1982 | 2 | 6.1 |
| 1983 | 18 | 6.1 |
| 1984 | 5 | 6.1 |
| 1985 | 1 | 6.1 |
| 1986 | 1 | 6.1 |
| 1987 | 10 | 6.1 |
| 1988 | 16 | 6.1 |
| 1989 | 1 | 6.1 |
| 1990 | 3 | 5.9 |
| 1991 | 9 | 5.9 |
| 1992 | 1 | 5.9 |
| 1993 | 4 | 5.9 |
| 1994 | 8 | 5.9 |
| 1995 | 7 | 5.9 |
| 1997 | 6 | 5.9 |
| 1999 | 9 | 5.9 |
| 2001 | 9 | 13.5 |
| 2002 | 18 | 13.5 |
| Year | First date | Last date |
|---|---|---|
| 1951 | 1951-08-31 | 1951-08-31 |
| 1952 | 1952-06-17 | 1952-08-27 |
| 1953 | 1953-06-20 | 1953-09-04 |
| 1954 | 1954-06-22 | 1954-07-31 |
| 1955 | 1955-07-05 | 1955-08-22 |
| 1956 | 1956-06-14 | 1956-08-17 |
| 1957 | 1957-06-16 | 1957-06-18 |
| 1958 | 1958-07-01 | 1958-08-31 |
| 1959 | 1959-05-29 | 1959-09-24 |
| 1962 | 1962-04-27 | 1962-09-01 |
| 1963 | 1963-06-27 | 1963-07-29 |
| 1964 | 1964-05-23 | 1964-08-29 |
| 1965 | 1965-06-07 | 1965-09-22 |
| 1966 | 1966-07-02 | 1966-08-19 |
| 1967 | 1967-06-11 | 1967-06-16 |
| 1968 | 1968-06-09 | 1968-08-25 |
| 1969 | 1969-06-27 | 1969-07-17 |
| 1970 | 1970-07-27 | 1970-08-16 |
| 1971 | 1971-05-19 | 1971-06-30 |
| 1972 | 1972-07-12 | 1972-07-19 |
| 1973 | 1973-06-11 | 1973-09-05 |
| 1974 | 1974-06-10 | 1974-07-14 |
| 1975 | 1975-05-20 | 1975-08-03 |
| 1976 | 1976-04-18 | 1976-04-19 |
| 1977 | 1977-07-15 | 1977-08-29 |
| 1978 | 1978-07-08 | 1978-07-23 |
| 1979 | 1979-05-09 | 1979-07-31 |
| 1980 | 1980-06-25 | 1980-09-02 |
| 1981 | 1981-06-16 | 1981-06-16 |
| 1982 | 1982-07-17 | 1982-07-18 |
| 1983 | 1983-06-13 | 1983-09-20 |
| 1984 | 1984-06-08 | 1984-06-13 |
| 1985 | 1985-08-15 | 1985-08-15 |
| 1986 | 1986-07-06 | 1986-07-06 |
| 1987 | 1987-05-30 | 1987-08-18 |
| 1988 | 1988-06-14 | 1988-08-14 |
| 1989 | 1989-07-26 | 1989-07-26 |
| 1990 | 1990-04-28 | 1990-07-05 |
| 1991 | 1991-06-27 | 1991-08-30 |
| 1992 | 1992-08-27 | 1992-08-27 |
| 1993 | 1993-07-06 | 1993-08-27 |
| 1994 | 1994-06-15 | 1994-07-21 |
| 1995 | 1995-06-19 | 1995-08-01 |
| 1997 | 1997-06-21 | 1997-08-16 |
| 1999 | 1999-06-07 | 1999-07-31 |
| 2001 | 2001-06-15 | 2001-08-10 |
| 2002 | 2002-04-17 | 2002-09-10 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 47 | 18 | 1955 | 18 |
| 35 C (95 F): Days | 1 | 2 | 1953 | 2 |
| 90 F (32.2 C): Days | 17 | 8 | 1953 | 3 |
| 0 C (32 F): Ice days (max | 51 | 88 | 1969 | 42 |
| 0 C (32 F): Frost days (min | 52 | 175 | 1978 | 134 |
| -10 C (14 F): Days with min | 52 | 73 | 1978 | 64 |
| -20 C (-4 F): Days with min | 52 | 17 | 1968 | 15 |
| -30 C (-22 F): Days with min | 8 | 1 | 1955 | 1 |
| 20 C (68 F): Tropical nights (min | 41 | 11 | 1988 | 4 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 52 | 55 | 1990 | 35 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 52 | 17 | 2002 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 38 | 4 | 1975 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1976 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 50 | 13 | 1977 | 8 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 29 | 4 | 1969 | 2 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 3 | 1 | 1958 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.
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).