Graterford 1 E Threshold Days by Year (USC00363437)
17 fixed thresholds counted per year at Graterford 1 E (USC00363437): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Graterford 1 E Thresholds
- Graterford 1 E: days with 10 mm (0.39 in) or more of precipitation in 52 years, most in 2018 with 58.
- Graterford 1 E: days with 25 mm (0.98 in) or more of precipitation in 52 years, most in 1984 with 20.
- Graterford 1 E: days with a maximum temperature at or above 30 C (86 F) in 51 years, most in 2007 with 77.
- Graterford 1 E: days with a maximum temperature at or above 90 F (32.2 C) in 51 years, most in 1999 with 44.
- 17 fixed thresholds have at least one qualifying day at Graterford 1 E.
Days at or above 30 C (86 F)
51 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1961 | 37 | 35.8 |
| 1962 | 33 | 35.8 |
| 1963 | 27 | 35.8 |
| 1964 | 41 | 35.8 |
| 1965 | 42 | 35.8 |
| 1966 | 57 | 35.8 |
| 1967 | 17 | 35.8 |
| 1968 | 26 | 35.8 |
| 1969 | 42 | 35.8 |
| 1970 | 40 | 32.5 |
| 1973 | 46 | 32.5 |
| 1974 | 25 | 32.5 |
| 1975 | 30 | 32.5 |
| 1976 | 38 | 32.5 |
| 1977 | 28 | 32.5 |
| 1978 | 30 | 32.5 |
| 1979 | 23 | 32.5 |
| 1982 | 28 | 33.4 |
| 1983 | 67 | 33.4 |
| 1984 | 41 | 33.4 |
| 1985 | 19 | 33.4 |
| 1986 | 16 | 33.4 |
| 1987 | 27 | 33.4 |
| 1988 | 39 | 33.4 |
| 1989 | 30 | 33.4 |
| 1990 | 44 | 48.3 |
| 1991 | 62 | 48.3 |
| 1992 | 24 | 48.3 |
| 1993 | 52 | 48.3 |
| 1994 | 42 | 48.3 |
| 1995 | 57 | 48.3 |
| 1997 | 34 | 48.3 |
| 1999 | 71 | 48.3 |
| 2000 | 30 | 42.2 |
| 2001 | 25 | 42.2 |
| 2002 | 60 | 42.2 |
| 2003 | 20 | 42.2 |
| 2004 | 34 | 42.2 |
| 2005 | 66 | 42.2 |
| 2006 | 49 | 42.2 |
| 2007 | 77 | 42.2 |
| 2009 | 19 | 42.2 |
| 2011 | 39 | 47.2 |
| 2012 | 45 | 47.2 |
| 2013 | 34 | 47.2 |
| 2014 | 32 | 47.2 |
| 2015 | 47 | 47.2 |
| 2016 | 63 | 47.2 |
| 2017 | 46 | 47.2 |
| 2018 | 57 | 47.2 |
| 2019 | 62 | 47.2 |
| Year | First date | Last date |
|---|---|---|
| 1961 | 1961-06-03 | 1961-09-25 |
| 1962 | 1962-04-27 | 1962-09-02 |
| 1963 | 1963-05-10 | 1963-08-24 |
| 1964 | 1964-05-20 | 1964-09-24 |
| 1965 | 1965-05-04 | 1965-09-24 |
| 1966 | 1966-06-05 | 1966-09-04 |
| 1967 | 1967-06-11 | 1967-08-20 |
| 1968 | 1968-06-07 | 1968-09-26 |
| 1969 | 1969-05-29 | 1969-09-16 |
| 1970 | 1970-05-13 | 1970-09-27 |
| 1973 | 1973-06-05 | 1973-09-06 |
| 1974 | 1974-05-18 | 1974-09-14 |
| 1975 | 1975-05-21 | 1975-08-27 |
| 1976 | 1976-04-17 | 1976-09-15 |
| 1977 | 1977-04-13 | 1977-08-10 |
| 1978 | 1978-05-21 | 1978-09-08 |
| 1979 | 1979-05-10 | 1979-09-05 |
| 1982 | 1982-07-08 | 1982-09-16 |
| 1983 | 1983-05-01 | 1983-09-21 |
| 1984 | 1984-06-08 | 1984-08-17 |
| 1985 | 1985-04-20 | 1985-09-08 |
| 1986 | 1986-05-07 | 1986-07-26 |
| 1987 | 1987-05-19 | 1987-08-19 |
| 1988 | 1988-06-15 | 1988-09-24 |
| 1989 | 1989-05-20 | 1989-09-12 |
| 1990 | 1990-04-27 | 1990-10-07 |
| 1991 | 1991-04-09 | 1991-09-18 |
| 1992 | 1992-05-22 | 1992-09-19 |
| 1993 | 1993-05-11 | 1993-09-16 |
| 1994 | 1994-04-28 | 1994-09-18 |
| 1995 | 1995-05-25 | 1995-09-08 |
| 1997 | 1997-06-11 | 1997-09-02 |
| 1999 | 1999-05-22 | 1999-09-11 |
| 2000 | 2000-05-05 | 2000-09-10 |
| 2001 | 2001-04-24 | 2001-09-10 |
| 2002 | 2002-04-17 | 2002-10-03 |
| 2003 | 2003-06-06 | 2003-07-28 |
| 2004 | 2004-04-20 | 2004-09-02 |
| 2005 | 2005-06-06 | 2005-09-24 |
| 2006 | 2006-05-29 | 2006-09-07 |
| 2007 | 2007-05-26 | 2007-10-23 |
| 2009 | 2009-04-25 | 2009-08-22 |
| 2011 | 2011-05-27 | 2011-08-27 |
| 2012 | 2012-05-29 | 2012-09-09 |
| 2013 | 2013-05-30 | 2013-10-06 |
| 2014 | 2014-06-04 | 2014-09-07 |
| 2015 | 2015-05-28 | 2015-09-18 |
| 2016 | 2016-05-26 | 2016-09-24 |
| 2017 | 2017-05-18 | 2017-09-28 |
| 2018 | 2018-05-03 | 2018-09-17 |
| 2019 | 2019-05-20 | 2019-10-03 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 51 | 77 | 2007 | 62 |
| 35 C (95 F): Days | 35 | 21 | 1999 | 3 |
| 40 C (104 F): Days | 1 | 1 | 1999 | 1 |
| 90 F (32.2 C): Days | 51 | 44 | 1999 | 26 |
| 100 F (37.8 C): Days | 6 | 6 | 1999 | 1 |
| 0 C (32 F): Ice days (max | 51 | 51 | 1978 | 12 |
| 0 C (32 F): Frost days (min | 51 | 187 | 1987 | 127 |
| -10 C (14 F): Days with min | 51 | 47 | 1993 | 15 |
| -20 C (-4 F): Days with min | 22 | 5 | 1961 | 1 |
| 20 C (68 F): Tropical nights (min | 50 | 41 | 1973 | 23 |
| 25 C (77 F): Days with min | 6 | 13 | 1984 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 52 | 58 | 2018 | 43 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 52 | 20 | 1984 | 12 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 44 | 7 | 2004 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 7 | 2 | 2004 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 17 | 8 | 1966 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 7 | 2 | 1978 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.
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).