Norton Dam Threshold Days by Year (USC00145852)
20 fixed thresholds counted per year at Norton Dam (USC00145852): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Norton Dam Thresholds
- Norton Dam: nights with a minimum temperature at or below 0 C (32 F) in 55 years, most in 2023 with 180.
- Norton Dam: nights with a minimum temperature at or below -10 C (14 F) in 55 years, most in 2022 with 72.
- Norton Dam: nights with a minimum temperature at or above 20 C (68 F) in 55 years, most in 2002 with 39.
- Norton Dam: days with a maximum temperature at or above 30 C (86 F) in 54 years, most in 2012 with 107.
- 20 fixed thresholds have at least one qualifying day at Norton Dam.
Days at or above 30 C (86 F)
54 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1965 | 60 | 60.6 |
| 1966 | 69 | 60.6 |
| 1967 | 49 | 60.6 |
| 1968 | 71 | 60.6 |
| 1969 | 54 | 60.6 |
| 1970 | 90 | 73.4 |
| 1971 | 80 | 73.4 |
| 1972 | 64 | 73.4 |
| 1973 | 68 | 73.4 |
| 1974 | 66 | 73.4 |
| 1975 | 72 | 73.4 |
| 1976 | 76 | 73.4 |
| 1977 | 61 | 73.4 |
| 1978 | 83 | 73.4 |
| 1979 | 74 | 73.4 |
| 1980 | 95 | 80.5 |
| 1981 | 66 | 80.5 |
| 1990 | 86 | 71 |
| 1991 | 88 | 71 |
| 1992 | 44 | 71 |
| 1993 | 51 | 71 |
| 1994 | 82 | 71 |
| 1995 | 76 | 71 |
| 1996 | 58 | 71 |
| 1997 | 70 | 71 |
| 1998 | 91 | 71 |
| 1999 | 64 | 71 |
| 2000 | 100 | 84.1 |
| 2001 | 85 | 84.1 |
| 2002 | 102 | 84.1 |
| 2003 | 89 | 84.1 |
| 2004 | 86 | 84.1 |
| 2005 | 88 | 84.1 |
| 2006 | 87 | 84.1 |
| 2007 | 88 | 84.1 |
| 2008 | 61 | 84.1 |
| 2009 | 55 | 84.1 |
| 2010 | 90 | 89.9 |
| 2011 | 86 | 89.9 |
| 2012 | 107 | 89.9 |
| 2013 | 89 | 89.9 |
| 2014 | 85 | 89.9 |
| 2015 | 89 | 89.9 |
| 2016 | 84 | 89.9 |
| 2017 | 93 | 89.9 |
| 2018 | 91 | 89.9 |
| 2019 | 85 | 89.9 |
| 2020 | 99 | 97.9 |
| 2021 | 100 | 97.9 |
| 2022 | 107 | 97.9 |
| 2023 | 87 | 97.9 |
| 2024 | 94 | 97.9 |
| 2025 | 88 | 97.9 |
| 2026 | 110 | 97.9 |
| Year | First date | Last date |
|---|---|---|
| 1965 | 1965-04-23 | 1965-10-10 |
| 1966 | 1966-05-05 | 1966-10-14 |
| 1967 | 1967-03-25 | 1967-10-13 |
| 1968 | 1968-03-31 | 1968-10-16 |
| 1969 | 1969-05-28 | 1969-10-01 |
| 1970 | 1970-04-28 | 1970-10-06 |
| 1971 | 1971-04-01 | 1971-10-11 |
| 1972 | 1972-03-07 | 1972-10-11 |
| 1973 | 1973-05-19 | 1973-10-09 |
| 1974 | 1974-05-20 | 1974-10-11 |
| 1975 | 1975-05-05 | 1975-10-23 |
| 1976 | 1976-05-20 | 1976-10-02 |
| 1977 | 1977-04-11 | 1977-10-27 |
| 1978 | 1978-04-01 | 1978-10-21 |
| 1979 | 1979-04-20 | 1979-10-16 |
| 1980 | 1980-04-21 | 1980-11-07 |
| 1981 | 1981-04-26 | 1981-09-30 |
| 1990 | 1990-04-23 | 1990-10-06 |
| 1991 | 1991-04-06 | 1991-10-18 |
| 1992 | 1992-04-15 | 1992-10-22 |
| 1993 | 1993-05-28 | 1993-10-08 |
| 1994 | 1994-04-18 | 1994-09-30 |
| 1995 | 1995-04-15 | 1995-10-17 |
| 1996 | 1996-04-03 | 1996-10-13 |
| 1997 | 1997-05-17 | 1997-10-07 |
| 1998 | 1998-05-14 | 1998-09-30 |
| 1999 | 1999-05-31 | 1999-10-07 |
| 2000 | 2000-04-06 | 2000-10-02 |
| 2001 | 2001-05-02 | 2001-10-03 |
| 2002 | 2002-04-15 | 2002-10-02 |
| 2003 | 2003-04-02 | 2003-10-23 |
| 2004 | 2004-04-17 | 2004-09-20 |
| 2005 | 2005-05-11 | 2005-10-19 |
| 2006 | 2006-04-14 | 2006-10-08 |
| 2007 | 2007-04-30 | 2007-10-07 |
| 2008 | 2008-05-19 | 2008-09-29 |
| 2009 | 2009-04-23 | 2009-09-08 |
| 2010 | 2010-05-05 | 2010-10-09 |
| 2011 | 2011-04-10 | 2011-10-05 |
| 2012 | 2012-04-01 | 2012-10-04 |
| 2013 | 2013-04-29 | 2013-09-27 |
| 2014 | 2014-04-10 | 2014-10-25 |
| 2015 | 2015-03-16 | 2015-10-12 |
| 2016 | 2016-05-07 | 2016-09-24 |
| 2017 | 2017-03-20 | 2017-09-24 |
| 2018 | 2018-05-06 | 2018-10-04 |
| 2019 | 2019-04-21 | 2019-10-01 |
| 2020 | 2020-04-28 | 2020-10-12 |
| 2021 | 2021-04-05 | 2021-09-30 |
| 2022 | 2022-04-13 | 2022-10-24 |
| 2023 | 2023-04-11 | 2023-10-21 |
| 2024 | 2024-04-14 | 2024-10-11 |
| 2025 | 2025-03-28 | 2025-10-12 |
| 2026 | 2026-03-20 | 2026-10-13 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 54 | 107 | 2012 | 110 |
| 35 C (95 F): Days | 54 | 61 | 2000 | 34 |
| 40 C (104 F): Days | 40 | 18 | 2012 | 7 |
| 45 C (113 F): Days | 1 | 2 | 2012 | 2 |
| 90 F (32.2 C): Days | 54 | 87 | 2012 | 76 |
| 100 F (37.8 C): Days | 50 | 35 | 2022 | 13 |
| 110 F (43.3 C): Days | 6 | 3 | 2012 | 1 |
| 0 C (32 F): Ice days (max | 54 | 63 | 1978 | 8 |
| 0 C (32 F): Frost days (min | 55 | 180 | 2023 | 87 |
| -10 C (14 F): Days with min | 55 | 72 | 2022 | 23 |
| -20 C (-4 F): Days with min | 49 | 18 | 1972 | 5 |
| -30 C (-22 F): Days with min | 2 | 3 | 2021 | 3 |
| 20 C (68 F): Tropical nights (min | 55 | 39 | 2002 | 19 |
| 25 C (77 F): Days with min | 1 | 0 | n/a | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 46 | 29 | 1965 | 4 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 46 | 11 | 1981 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 32 | 4 | 2008 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 1 | 1966 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 36 | 4 | 1979 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 6 | 1 | 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 1965.
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 (2026-10-17).