Boundary Dam Threshold Days by Year (USC00450844)
17 fixed thresholds counted per year at Boundary Dam (USC00450844): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Boundary Dam Thresholds
- Boundary Dam: days with a maximum temperature at or above 30 C (86 F) in 56 years, most in 2017 with 60.
- Boundary Dam: days with a maximum temperature at or below 0 C (32 F) in 56 years, most in 1985 with 71.
- Boundary Dam: nights with a minimum temperature at or below 0 C (32 F) in 56 years, most in 2008 with 210.
- Boundary Dam: nights with a minimum temperature at or below -10 C (14 F) in 56 years, most in 1985 with 58.
- 17 fixed thresholds have at least one qualifying day at Boundary Dam.
Days at or above 30 C (86 F)
56 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1966 | 28 | 31.5 |
| 1967 | 58 | 31.5 |
| 1968 | 15 | 31.5 |
| 1969 | 25 | 31.5 |
| 1970 | 26 | 23.8 |
| 1976 | 3 | 23.8 |
| 1977 | 41 | 23.8 |
| 1978 | 16 | 23.8 |
| 1979 | 33 | 23.8 |
| 1980 | 13 | 27.5 |
| 1981 | 26 | 27.5 |
| 1982 | 8 | 27.5 |
| 1983 | 9 | 27.5 |
| 1984 | 27 | 27.5 |
| 1985 | 38 | 27.5 |
| 1986 | 41 | 27.5 |
| 1987 | 37 | 27.5 |
| 1988 | 45 | 27.5 |
| 1989 | 31 | 27.5 |
| 1990 | 37 | 30.4 |
| 1991 | 21 | 30.4 |
| 1992 | 39 | 30.4 |
| 1993 | 19 | 30.4 |
| 1994 | 41 | 30.4 |
| 1995 | 22 | 30.4 |
| 1996 | 32 | 30.4 |
| 1997 | 18 | 30.4 |
| 1998 | 50 | 30.4 |
| 1999 | 25 | 30.4 |
| 2000 | 30 | 40.3 |
| 2001 | 42 | 40.3 |
| 2002 | 34 | 40.3 |
| 2003 | 55 | 40.3 |
| 2004 | 41 | 40.3 |
| 2005 | 32 | 40.3 |
| 2006 | 55 | 40.3 |
| 2007 | 47 | 40.3 |
| 2008 | 29 | 40.3 |
| 2009 | 38 | 40.3 |
| 2010 | 27 | 38.3 |
| 2011 | 31 | 38.3 |
| 2012 | 27 | 38.3 |
| 2013 | 42 | 38.3 |
| 2014 | 30 | 38.3 |
| 2015 | 54 | 38.3 |
| 2016 | 36 | 38.3 |
| 2017 | 60 | 38.3 |
| 2018 | 39 | 38.3 |
| 2019 | 37 | 38.3 |
| 2020 | 35 | 48.6 |
| 2021 | 50 | 48.6 |
| 2022 | 46 | 48.6 |
| 2023 | 55 | 48.6 |
| 2024 | 47 | 48.6 |
| 2025 | 59 | 48.6 |
| 2026 | 48 | 48.6 |
| Year | First date | Last date |
|---|---|---|
| 1966 | 1966-05-04 | 1966-09-06 |
| 1967 | 1967-06-15 | 1967-09-22 |
| 1968 | 1968-07-20 | 1968-08-11 |
| 1969 | 1969-07-01 | 1969-09-12 |
| 1970 | 1970-06-24 | 1970-09-01 |
| 1976 | 1976-08-01 | 1976-09-02 |
| 1977 | 1977-04-24 | 1977-08-23 |
| 1978 | 1978-07-24 | 1978-08-10 |
| 1979 | 1979-06-30 | 1979-08-30 |
| 1980 | 1980-07-10 | 1980-08-14 |
| 1981 | 1981-07-05 | 1981-09-19 |
| 1982 | 1982-07-27 | 1982-08-26 |
| 1983 | 1983-07-23 | 1983-08-10 |
| 1984 | 1984-07-12 | 1984-08-27 |
| 1985 | 1985-06-28 | 1985-08-30 |
| 1986 | 1986-05-26 | 1986-08-30 |
| 1987 | 1987-05-08 | 1987-09-13 |
| 1988 | 1988-05-13 | 1988-09-15 |
| 1989 | 1989-06-05 | 1989-08-14 |
| 1990 | 1990-07-10 | 1990-09-12 |
| 1991 | 1991-07-03 | 1991-09-07 |
| 1992 | 1992-05-06 | 1992-08-21 |
| 1993 | 1993-05-12 | 1993-09-11 |
| 1994 | 1994-05-09 | 1994-08-29 |
| 1995 | 1995-05-29 | 1995-09-05 |
| 1996 | 1996-07-03 | 1996-08-31 |
| 1997 | 1997-07-20 | 1997-09-02 |
| 1998 | 1998-05-03 | 1998-09-17 |
| 1999 | 1999-05-24 | 1999-08-29 |
| 2000 | 2000-06-27 | 2000-08-25 |
| 2001 | 2001-05-24 | 2001-09-17 |
| 2002 | 2002-07-11 | 2002-09-14 |
| 2003 | 2003-05-25 | 2003-09-07 |
| 2004 | 2004-06-21 | 2004-08-22 |
| 2005 | 2005-05-28 | 2005-08-29 |
| 2006 | 2006-05-16 | 2006-09-09 |
| 2007 | 2007-06-01 | 2007-09-16 |
| 2008 | 2008-05-17 | 2008-08-25 |
| 2009 | 2009-06-05 | 2009-09-17 |
| 2010 | 2010-07-09 | 2010-08-27 |
| 2011 | 2011-07-08 | 2011-09-24 |
| 2012 | 2012-06-23 | 2012-08-29 |
| 2013 | 2013-05-07 | 2013-09-16 |
| 2014 | 2014-07-04 | 2014-08-28 |
| 2015 | 2015-05-22 | 2015-09-13 |
| 2016 | 2016-05-08 | 2016-09-01 |
| 2017 | 2017-06-25 | 2017-09-13 |
| 2018 | 2018-07-06 | 2018-09-08 |
| 2019 | 2019-05-29 | 2019-09-06 |
| 2020 | 2020-06-27 | 2020-09-12 |
| 2021 | 2021-05-17 | 2021-09-08 |
| 2022 | 2022-06-29 | 2022-09-07 |
| 2023 | 2023-05-01 | 2023-08-30 |
| 2024 | 2024-06-22 | 2024-09-26 |
| 2025 | 2025-05-26 | 2025-09-21 |
| 2026 | 2026-05-29 | 2026-08-28 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 56 | 60 | 2017 | 48 |
| 35 C (95 F): Days | 54 | 30 | 2021 | 12 |
| 40 C (104 F): Days | 6 | 6 | 2021 | 1 |
| 90 F (32.2 C): Days | 55 | 43 | 2017 | 29 |
| 100 F (37.8 C): Days | 21 | 9 | 2021 | 3 |
| 110 F (43.3 C): Days | 1 | 2 | 2021 | 2 |
| 0 C (32 F): Ice days (max | 56 | 71 | 1985 | 15 |
| 0 C (32 F): Frost days (min | 56 | 210 | 2008 | 113 |
| -10 C (14 F): Days with min | 56 | 58 | 1985 | 9 |
| -20 C (-4 F): Days with min | 36 | 16 | 1985 | 4 |
| -30 C (-22 F): Days with min | 2 | 3 | 1968 | 2 |
| 20 C (68 F): Tropical nights (min | 1 | 1 | 2021 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 56 | 37 | 2012 | 9 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 44 | 6 | 2022 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 3 | 1 | 1997 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 39 | 10 | 1990 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 4 | 2 | 1984 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.
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).