Birch Hill Dam Threshold Days by Year (USC00190666)
16 fixed thresholds counted per year at Birch Hill Dam (USC00190666): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Birch Hill Dam Thresholds
- Birch Hill Dam: days with 10 cm (3.9 in) or more of snowfall in 70 years, most in 1956 with 15.
- Birch Hill Dam: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 2018 with 51.
- Birch Hill Dam: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 2014 with 17.
- Birch Hill Dam: days with a maximum temperature at or above 30 C (86 F) in 58 years, most in 1955 with 44.
- 16 fixed thresholds have at least one qualifying day at Birch Hill Dam.
Days at or above 30 C (86 F)
58 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1949 | 32 | 32 |
| 1950 | 9 | 20.3 |
| 1951 | 6 | 20.3 |
| 1952 | 21 | 20.3 |
| 1953 | 31 | 20.3 |
| 1954 | 9 | 20.3 |
| 1955 | 44 | 20.3 |
| 1956 | 15 | 20.3 |
| 1957 | 24 | 20.3 |
| 1958 | 6 | 20.3 |
| 1959 | 38 | 20.3 |
| 1960 | 9 | 19.3 |
| 1961 | 29 | 19.3 |
| 1962 | 12 | 19.3 |
| 1963 | 18 | 19.3 |
| 1964 | 24 | 19.3 |
| 1965 | 25 | 19.3 |
| 1966 | 34 | 19.3 |
| 1967 | 12 | 19.3 |
| 1968 | 16 | 19.3 |
| 1969 | 14 | 19.3 |
| 1970 | 15 | 13.5 |
| 1971 | 11 | 13.5 |
| 1972 | 9 | 13.5 |
| 1973 | 18 | 13.5 |
| 1974 | 12 | 13.5 |
| 1975 | 15 | 13.5 |
| 1976 | 11 | 13.5 |
| 1977 | 12 | 13.5 |
| 1978 | 13 | 13.5 |
| 1979 | 19 | 13.5 |
| 1980 | 23 | 18.3 |
| 1981 | 10 | 18.3 |
| 1982 | 7 | 18.3 |
| 1983 | 39 | 18.3 |
| 1984 | 15 | 18.3 |
| 1985 | 7 | 18.3 |
| 1986 | 7 | 18.3 |
| 1987 | 22 | 18.3 |
| 1988 | 34 | 18.3 |
| 1989 | 19 | 18.3 |
| 1990 | 15 | 15 |
| 2002 | 38 | 24.8 |
| 2004 | 6 | 24.8 |
| 2005 | 36 | 24.8 |
| 2006 | 19 | 24.8 |
| 2007 | 25 | 24.8 |
| 2011 | 25 | 24.8 |
| 2012 | 29 | 24.8 |
| 2013 | 23 | 24.8 |
| 2014 | 12 | 24.8 |
| 2015 | 20 | 24.8 |
| 2016 | 33 | 24.8 |
| 2017 | 22 | 24.8 |
| 2018 | 35 | 24.8 |
| 2019 | 24 | 24.8 |
| 2020 | 33 | 31.5 |
| 2021 | 30 | 31.5 |
| Year | First date | Last date |
|---|---|---|
| 1949 | 1949-05-05 | 1949-08-28 |
| 1950 | 1950-06-07 | 1950-07-14 |
| 1951 | 1951-07-11 | 1951-08-31 |
| 1952 | 1952-06-24 | 1952-08-28 |
| 1953 | 1953-05-10 | 1953-09-05 |
| 1954 | 1954-06-20 | 1954-08-25 |
| 1955 | 1955-05-25 | 1955-08-23 |
| 1956 | 1956-06-01 | 1956-09-05 |
| 1957 | 1957-06-15 | 1957-09-16 |
| 1958 | 1958-06-30 | 1958-09-05 |
| 1959 | 1959-05-21 | 1959-09-09 |
| 1960 | 1960-06-28 | 1960-09-08 |
| 1961 | 1961-05-14 | 1961-09-23 |
| 1962 | 1962-04-27 | 1962-08-07 |
| 1963 | 1963-06-24 | 1963-07-30 |
| 1964 | 1964-05-09 | 1964-09-11 |
| 1965 | 1965-05-10 | 1965-09-22 |
| 1966 | 1966-06-05 | 1966-09-02 |
| 1967 | 1967-06-03 | 1967-08-18 |
| 1968 | 1968-06-06 | 1968-08-26 |
| 1969 | 1969-06-12 | 1969-09-02 |
| 1970 | 1970-07-24 | 1970-09-23 |
| 1971 | 1971-06-08 | 1971-09-06 |
| 1972 | 1972-07-03 | 1972-08-27 |
| 1973 | 1973-06-12 | 1973-09-05 |
| 1974 | 1974-06-10 | 1974-08-23 |
| 1975 | 1975-05-21 | 1975-08-06 |
| 1976 | 1976-04-18 | 1976-08-23 |
| 1977 | 1977-05-18 | 1977-09-03 |
| 1978 | 1978-05-29 | 1978-08-18 |
| 1979 | 1979-05-10 | 1979-08-06 |
| 1980 | 1980-05-24 | 1980-09-23 |
| 1981 | 1981-05-26 | 1981-08-04 |
| 1982 | 1982-07-09 | 1982-07-20 |
| 1983 | 1983-06-13 | 1983-09-21 |
| 1984 | 1984-06-08 | 1984-08-17 |
| 1985 | 1985-05-12 | 1985-08-16 |
| 1986 | 1986-05-20 | 1986-07-26 |
| 1987 | 1987-05-30 | 1987-08-20 |
| 1988 | 1988-05-29 | 1988-08-16 |
| 1989 | 1989-05-20 | 1989-09-11 |
| 1990 | 1990-04-28 | 1990-09-03 |
| 2002 | 2002-04-17 | 2002-09-11 |
| 2004 | 2004-06-10 | 2004-08-30 |
| 2005 | 2005-06-04 | 2005-09-03 |
| 2006 | 2006-06-19 | 2006-08-04 |
| 2007 | 2007-05-11 | 2007-09-27 |
| 2011 | 2011-05-28 | 2011-08-21 |
| 2012 | 2012-04-17 | 2012-09-01 |
| 2013 | 2013-05-22 | 2013-09-12 |
| 2014 | 2014-06-18 | 2014-09-07 |
| 2015 | 2015-05-11 | 2015-09-10 |
| 2016 | 2016-05-26 | 2016-09-10 |
| 2017 | 2017-05-18 | 2017-09-28 |
| 2018 | 2018-05-03 | 2018-09-17 |
| 2019 | 2019-06-27 | 2019-08-21 |
| 2020 | 2020-05-27 | 2020-08-25 |
| 2021 | 2021-05-22 | 2021-08-31 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 58 | 44 | 1955 | 30 |
| 35 C (95 F): Days | 16 | 4 | 1953 | 3 |
| 90 F (32.2 C): Days | 55 | 23 | 2002 | 14 |
| 0 C (32 F): Ice days (max | 58 | 65 | 1978 | 33 |
| 0 C (32 F): Frost days (min | 57 | 203 | 1978 | 139 |
| -10 C (14 F): Days with min | 57 | 85 | 1989 | 30 |
| -20 C (-4 F): Days with min | 56 | 29 | 2015 | 2 |
| -30 C (-22 F): Days with min | 19 | 9 | 1971 | 3 |
| 20 C (68 F): Tropical nights (min | 46 | 20 | 2021 | 20 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 65 | 51 | 2018 | 14 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 65 | 17 | 2014 | 4 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 47 | 4 | 2011 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 6 | 1 | 1960 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 70 | 15 | 1956 | 4 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 33 | 3 | 1960 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 2 | 1 | 1961 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.
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 (2026-10-12).