Quincy Dam 21 Threshold Days by Year (USC00117077)
17 fixed thresholds counted per year at Quincy Dam 21 (USC00117077): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Quincy Dam 21 Thresholds
- Quincy Dam 21: days with 10 mm (0.39 in) or more of precipitation in 78 years, most in 1998 with 43.
- Quincy Dam 21: days with 25 mm (0.98 in) or more of precipitation in 78 years, most in 1973 with 16.
- Quincy Dam 21: days with 50 mm (1.97 in) or more of precipitation in 63 years, most in 1949 with 4.
- Quincy Dam 21: days with a maximum temperature at or above 30 C (86 F) in 45 years, most in 1983 with 81.
- 17 fixed thresholds have at least one qualifying day at Quincy Dam 21.
Days at or above 30 C (86 F)
45 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1938 | 59 | 65.5 |
| 1939 | 72 | 65.5 |
| 1940 | 61 | 60.5 |
| 1941 | 76 | 60.5 |
| 1942 | 54 | 60.5 |
| 1943 | 67 | 60.5 |
| 1944 | 67 | 60.5 |
| 1945 | 43 | 60.5 |
| 1946 | 50 | 60.5 |
| 1947 | 66 | 60.5 |
| 1978 | 68 | 63 |
| 1979 | 58 | 63 |
| 1980 | 70 | 54.8 |
| 1981 | 35 | 54.8 |
| 1982 | 40 | 54.8 |
| 1983 | 81 | 54.8 |
| 1984 | 48 | 54.8 |
| 1990 | 47 | 51.4 |
| 1991 | 65 | 51.4 |
| 1992 | 36 | 51.4 |
| 1996 | 45 | 51.4 |
| 1997 | 51 | 51.4 |
| 1998 | 60 | 51.4 |
| 1999 | 56 | 51.4 |
| 2000 | 59 | 56 |
| 2001 | 55 | 56 |
| 2002 | 71 | 56 |
| 2003 | 39 | 56 |
| 2005 | 77 | 56 |
| 2006 | 60 | 56 |
| 2007 | 75 | 56 |
| 2008 | 37 | 56 |
| 2009 | 31 | 56 |
| 2010 | 76 | 71.5 |
| 2012 | 80 | 71.5 |
| 2013 | 61 | 71.5 |
| 2016 | 69 | 71.5 |
| 2017 | 62 | 71.5 |
| 2018 | 81 | 71.5 |
| 2021 | 60 | 61.5 |
| 2022 | 53 | 61.5 |
| 2023 | 66 | 61.5 |
| 2024 | 62 | 61.5 |
| 2025 | 62 | 61.5 |
| 2026 | 66 | 61.5 |
| Year | First date | Last date |
|---|---|---|
| 1938 | 1938-06-21 | 1938-10-15 |
| 1939 | 1939-05-17 | 1939-10-25 |
| 1940 | 1940-05-05 | 1940-11-04 |
| 1941 | 1941-04-12 | 1941-09-23 |
| 1942 | 1942-04-29 | 1942-09-18 |
| 1943 | 1943-05-05 | 1943-10-10 |
| 1944 | 1944-05-15 | 1944-09-04 |
| 1945 | 1945-03-16 | 1945-09-23 |
| 1946 | 1946-06-07 | 1946-09-27 |
| 1947 | 1947-06-08 | 1947-10-15 |
| 1978 | 1978-05-25 | 1978-10-22 |
| 1979 | 1979-05-09 | 1979-10-22 |
| 1980 | 1980-04-22 | 1980-09-22 |
| 1981 | 1981-04-03 | 1981-10-01 |
| 1982 | 1982-05-05 | 1982-10-06 |
| 1983 | 1983-06-11 | 1983-09-20 |
| 1984 | 1984-07-03 | 1984-09-25 |
| 1990 | 1990-06-13 | 1990-09-28 |
| 1991 | 1991-05-14 | 1991-09-15 |
| 1992 | 1992-05-01 | 1992-09-18 |
| 1996 | 1996-05-10 | 1996-09-06 |
| 1997 | 1997-05-19 | 1997-10-08 |
| 1998 | 1998-05-15 | 1998-09-27 |
| 1999 | 1999-06-05 | 1999-09-26 |
| 2000 | 2000-05-09 | 2000-09-23 |
| 2001 | 2001-04-10 | 2001-10-01 |
| 2002 | 2002-04-16 | 2002-10-03 |
| 2003 | 2003-04-15 | 2003-10-20 |
| 2005 | 2005-05-11 | 2005-10-06 |
| 2006 | 2006-04-14 | 2006-10-04 |
| 2007 | 2007-04-30 | 2007-10-07 |
| 2008 | 2008-06-01 | 2008-09-03 |
| 2009 | 2009-05-22 | 2009-08-27 |
| 2010 | 2010-04-02 | 2010-10-10 |
| 2012 | 2012-04-02 | 2012-09-13 |
| 2013 | 2013-05-01 | 2013-10-05 |
| 2016 | 2016-05-31 | 2016-10-18 |
| 2017 | 2017-05-16 | 2017-10-15 |
| 2018 | 2018-05-13 | 2018-10-04 |
| 2021 | 2021-04-27 | 2021-10-01 |
| 2022 | 2022-04-24 | 2022-10-23 |
| 2023 | 2023-04-05 | 2023-10-04 |
| 2024 | 2024-05-20 | 2024-10-13 |
| 2025 | 2025-04-29 | 2025-10-04 |
| 2026 | 2026-03-22 | 2026-10-14 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 45 | 81 | 1983 | 66 |
| 35 C (95 F): Days | 44 | 29 | 2012 | 12 |
| 40 C (104 F): Days | 4 | 2 | 2005 | 1 |
| 90 F (32.2 C): Days | 45 | 60 | 1983 | 29 |
| 100 F (37.8 C): Days | 21 | 10 | 2012 | 6 |
| 0 C (32 F): Ice days (max | 45 | 63 | 1978 | 18 |
| 0 C (32 F): Frost days (min | 45 | 139 | 1980 | 51 |
| -10 C (14 F): Days with min | 45 | 58 | 1978 | 17 |
| -20 C (-4 F): Days with min | 31 | 18 | 1978 | 1 |
| 20 C (68 F): Tropical nights (min | 45 | 77 | 1941 | 51 |
| 25 C (77 F): Days with min | 32 | 22 | 1941 | 4 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 78 | 43 | 1998 | 26 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 78 | 16 | 1973 | 12 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 63 | 4 | 1949 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 7 | 2 | 1968 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 33 | 3 | 1964 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 0 | n/a | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.
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 (2026-10-18).