S Boston Threshold Days by Year (USC00447925)
17 fixed thresholds counted per year at S Boston (USC00447925): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for S Boston Thresholds
- S Boston: days with 10 mm (0.39 in) or more of precipitation in 55 years, most in 2003 with 54.
- S Boston: days with 25 mm (0.98 in) or more of precipitation in 55 years, most in 1975 with 23.
- S Boston: days with 50 mm (1.97 in) or more of precipitation in 53 years, most in 1995 with 7.
- S Boston: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 2019 with 122.
- 17 fixed thresholds have at least one qualifying day at S Boston.
Days at or above 30 C (86 F)
47 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1978 | 88 | 88 |
| 1981 | 81 | 82.1 |
| 1982 | 73 | 82.1 |
| 1983 | 91 | 82.1 |
| 1984 | 77 | 82.1 |
| 1985 | 83 | 82.1 |
| 1986 | 101 | 82.1 |
| 1987 | 95 | 82.1 |
| 1988 | 81 | 82.1 |
| 1989 | 57 | 82.1 |
| 1990 | 93 | 75.2 |
| 1991 | 112 | 75.2 |
| 1992 | 78 | 75.2 |
| 1993 | 91 | 75.2 |
| 1994 | 51 | 75.2 |
| 1995 | 58 | 75.2 |
| 1996 | 56 | 75.2 |
| 1997 | 54 | 75.2 |
| 1998 | 95 | 75.2 |
| 1999 | 64 | 75.2 |
| 2000 | 63 | 66.7 |
| 2001 | 56 | 66.7 |
| 2002 | 83 | 66.7 |
| 2003 | 53 | 66.7 |
| 2004 | 50 | 66.7 |
| 2005 | 77 | 66.7 |
| 2006 | 66 | 66.7 |
| 2007 | 91 | 66.7 |
| 2008 | 70 | 66.7 |
| 2009 | 58 | 66.7 |
| 2010 | 101 | 90.2 |
| 2011 | 88 | 90.2 |
| 2012 | 75 | 90.2 |
| 2013 | 64 | 90.2 |
| 2014 | 61 | 90.2 |
| 2015 | 86 | 90.2 |
| 2016 | 91 | 90.2 |
| 2017 | 100 | 90.2 |
| 2018 | 114 | 90.2 |
| 2019 | 122 | 90.2 |
| 2020 | 92 | 89.6 |
| 2021 | 91 | 89.6 |
| 2022 | 88 | 89.6 |
| 2023 | 79 | 89.6 |
| 2024 | 83 | 89.6 |
| 2025 | 72 | 89.6 |
| 2026 | 122 | 89.6 |
| Year | First date | Last date |
|---|---|---|
| 1978 | 1978-05-21 | 1978-09-23 |
| 1981 | 1981-04-13 | 1981-10-07 |
| 1982 | 1982-05-07 | 1982-09-19 |
| 1983 | 1983-04-29 | 1983-10-05 |
| 1984 | 1984-05-20 | 1984-10-22 |
| 1985 | 1985-03-30 | 1985-10-17 |
| 1986 | 1986-04-01 | 1986-10-06 |
| 1987 | 1987-04-23 | 1987-09-19 |
| 1988 | 1988-04-07 | 1988-09-29 |
| 1989 | 1989-04-19 | 1989-10-17 |
| 1990 | 1990-03-13 | 1990-10-10 |
| 1991 | 1991-04-18 | 1991-10-25 |
| 1992 | 1992-04-11 | 1992-09-19 |
| 1993 | 1993-05-07 | 1993-09-27 |
| 1994 | 1994-04-20 | 1994-09-17 |
| 1995 | 1995-04-20 | 1995-09-17 |
| 1996 | 1996-05-10 | 1996-09-11 |
| 1997 | 1997-05-19 | 1997-10-11 |
| 1998 | 1998-05-17 | 1998-10-02 |
| 1999 | 1999-04-05 | 1999-09-10 |
| 2000 | 2000-03-09 | 2000-09-25 |
| 2001 | 2001-04-09 | 2001-08-31 |
| 2002 | 2002-04-16 | 2002-10-06 |
| 2003 | 2003-05-09 | 2003-09-03 |
| 2004 | 2004-04-19 | 2004-09-23 |
| 2005 | 2005-05-13 | 2005-09-24 |
| 2006 | 2006-04-16 | 2006-08-31 |
| 2007 | 2007-03-28 | 2007-10-10 |
| 2008 | 2008-06-01 | 2008-10-06 |
| 2009 | 2009-04-25 | 2009-09-25 |
| 2010 | 2010-04-03 | 2010-09-26 |
| 2011 | 2011-04-25 | 2011-09-29 |
| 2012 | 2012-05-03 | 2012-09-09 |
| 2013 | 2013-04-11 | 2013-10-06 |
| 2014 | 2014-04-03 | 2014-09-22 |
| 2015 | 2015-05-12 | 2015-09-20 |
| 2016 | 2016-04-19 | 2016-10-20 |
| 2017 | 2017-04-16 | 2017-10-12 |
| 2018 | 2018-05-02 | 2018-10-09 |
| 2019 | 2019-04-25 | 2019-10-13 |
| 2020 | 2020-03-21 | 2020-09-14 |
| 2021 | 2021-04-08 | 2021-10-16 |
| 2022 | 2022-04-25 | 2022-09-23 |
| 2023 | 2023-03-25 | 2023-10-31 |
| 2024 | 2024-04-03 | 2024-11-08 |
| 2025 | 2025-04-05 | 2025-09-27 |
| 2026 | 2026-03-07 | 2026-10-15 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 47 | 122 | 2019 | 122 |
| 35 C (95 F): Days | 42 | 32 | 1988 | 32 |
| 40 C (104 F): Days | 3 | 1 | 1983 | 1 |
| 90 F (32.2 C): Days | 47 | 86 | 2019 | 74 |
| 100 F (37.8 C): Days | 17 | 7 | 1991 | 6 |
| 0 C (32 F): Ice days (max | 38 | 10 | 1989 | 3 |
| 0 C (32 F): Frost days (min | 44 | 157 | 1988 | 60 |
| -10 C (14 F): Days with min | 38 | 31 | 1981 | 9 |
| -20 C (-4 F): Days with min | 2 | 2 | 1983 | 2 |
| 20 C (68 F): Tropical nights (min | 44 | 78 | 2018 | 53 |
| 25 C (77 F): Days with min | 2 | 1 | 1978 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 55 | 54 | 2003 | 20 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 55 | 23 | 1975 | 9 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 53 | 7 | 1995 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 9 | 2 | 1996 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 10 | 2 | 2000 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 2000 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1978.
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).