Nights at or below -10 C (14 F) in Boston

Boston has had nights with a minimum temperature at or below -10 C (14 F) in 91 years, most in 1948 with 33. Days per year, season span, streaks and every date.

Key Facts for Boston

Boston has had nights with a minimum temperature at or below -10 C (14 F) in 91 years, 1,373 days in all.
The most in one year was 33 days in 1948.
In 2026, the latest year on file, there were 15 such days.
The earliest first date in a year was 1 January 1938.
The latest last date in a year was 31 December 1956.
The longest run inside a single year was 16 days in 1961.
1 year with under 90 percent of days observed is left out of these rankings.

Days per Year

91 years, 1,373 days

Days per year in Boston with a minimum temperature at or below -10 C (14 F). The line is the decade average. The most was 33 in 1948. Grey bars are years with under 90 percent of days observed, left out of rankings.

Nights at or below -10 C (14 F) per year in Boston
Year	Days	Decade average
1936	32	18
1937	3	18
1938	20	18
1939	17	18
1940	20	21.7
1941	17	21.7
1942	26	21.7
1943	29	21.7
1944	21	21.7
1945	20	21.7
1946	29	21.7
1947	17	21.7
1948	33	21.7
1949	5	21.7
1950	21	14.5
1951	12	14.5
1952	7	14.5
1953	7	14.5
1954	16	14.5
1955	15	14.5
1956	8	14.5
1957	15	14.5
1958	22	14.5
1959	22	14.5
1960	15	18.8
1961	19	18.8
1962	26	18.8
1963	28	18.8
1964	14	18.8
1965	19	18.8
1966	14	18.8
1967	15	18.8
1968	31	18.8
1969	7	18.8
1970	19	15.2
1971	20	15.2
1972	11	15.2
1973	15	15.2
1974	10	15.2
1975	12	15.2
1976	20	15.2
1977	17	15.2
1978	7	15.2
1979	21	15.2
1980	23	18.7
1981	22	18.7
1982	21	18.7
1983	15	18.7
1984	17	18.7
1985	19	18.7
1986	11	18.7
1987	15	18.7
1988	17	18.7
1989	27	18.7
1990	5	12.8
1991	12	12.8
1992	15	12.8
1993	17	12.8
1994	28	12.8
1995	11	12.8
1996	16	12.8
1997	7	12.8
1998	7	12.8
1999	10	12.8
2000	17	12.9
2001	5	12.9
2002	3	12.9
2003	23	12.9
2004	20	12.9
2005	16	12.9
2006	6	12.9
2007	16	12.9
2008	8	12.9
2009	15	12.9
2010	8	10.6
2011	9	10.6
2012	4	10.6
2013	9	10.6
2014	15	10.6
2015	26	10.6
2016	7	10.6
2017	13	10.6
2018	8	10.6
2019	7	10.6
2020	1	7
2021	5	7
2022	14	7
2023	3	7
2024	2	7
2025	9	7
2026	15	7

Season Span

earliest 1 January, latest 31 December

For each year, a bar from the first to the last day in Boston meeting -10 C (14 F). Long bars mean a long season.

First to last qualifying date each year in Boston
Year	First date	Last date
1936	1936-01-23	1936-12-23
1937	1937-02-02	1937-02-04
1938	1938-01-01	1938-12-29
1939	1939-01-18	1939-12-28
1940	1940-01-01	1940-12-04
1941	1941-01-07	1941-12-22
1942	1942-01-06	1942-12-22
1943	1943-01-04	1943-12-29
1944	1944-01-08	1944-12-29
1945	1945-01-06	1945-12-23
1946	1946-01-03	1946-12-31
1947	1947-01-01	1947-12-30
1948	1948-01-10	1948-12-27
1949	1949-01-15	1949-03-20
1950	1950-01-08	1950-12-28
1951	1951-01-09	1951-12-28
1952	1952-01-22	1952-12-28
1953	1953-02-01	1953-12-19
1954	1954-01-08	1954-02-13
1955	1955-01-21	1955-12-31
1956	1956-01-01	1956-12-31
1957	1957-01-01	1957-02-12
1958	1958-01-04	1958-12-26
1959	1959-01-05	1959-12-23
1960	1960-01-09	1960-12-28
1961	1961-01-19	1961-12-30
1962	1962-01-04	1962-12-31
1963	1963-01-01	1963-12-31
1964	1964-01-01	1964-12-19
1965	1965-01-14	1965-12-20
1966	1966-01-08	1966-12-04
1967	1967-01-18	1967-03-19
1968	1968-01-01	1968-12-27
1969	1969-01-01	1969-12-25
1970	1970-01-08	1970-12-23
1971	1971-01-08	1971-12-19
1972	1972-01-01	1972-12-17
1973	1973-01-06	1973-12-19
1974	1974-01-12	1974-02-15
1975	1975-01-21	1975-12-25
1976	1976-01-05	1976-12-22
1977	1977-01-01	1977-12-12
1978	1978-01-10	1978-02-11
1979	1979-01-11	1979-12-20
1980	1980-01-04	1980-12-31
1981	1981-01-01	1981-12-21
1982	1982-01-10	1982-12-14
1983	1983-01-04	1983-12-27
1984	1984-01-11	1984-12-27
1985	1985-01-08	1985-12-26
1986	1986-01-07	1986-03-21
1987	1987-01-24	1987-12-31
1988	1988-01-05	1988-12-17
1989	1989-01-04	1989-12-29
1990	1990-01-22	1990-03-07
1991	1991-01-08	1991-12-19
1992	1992-01-16	1992-12-27
1993	1993-01-30	1993-12-31
1994	1994-01-06	1994-12-30
1995	1995-01-11	1995-02-26
1996	1996-01-04	1996-12-31
1997	1997-01-01	1997-12-31
1998	1998-01-01	1998-12-31
1999	1999-01-01	1999-12-25
2000	2000-01-13	2000-12-26
2001	2001-01-10	2001-02-22
2002	2002-02-11	2002-12-09
2003	2003-01-15	2003-03-07
2004	2004-01-08	2004-12-28
2005	2005-01-17	2005-12-15
2006	2006-01-15	2006-02-27
2007	2007-01-17	2007-03-09
2008	2008-01-02	2008-12-31
2009	2009-01-01	2009-12-30
2010	2010-01-09	2010-12-10
2011	2011-01-17	2011-03-03
2012	2012-01-03	2012-01-16
2013	2013-01-02	2013-12-17
2014	2014-01-02	2014-03-06
2015	2015-01-07	2015-03-06
2016	2016-01-05	2016-12-16
2017	2017-01-08	2017-12-31
2018	2018-01-01	2018-02-03
2019	2019-01-20	2019-02-27
2020	2020-02-15	2020-02-15
2021	2021-01-29	2021-03-02
2022	2022-01-11	2022-12-24
2023	2023-02-03	2023-02-25
2024	2024-12-22	2024-12-23
2025	2025-01-21	2025-12-26
2026	2026-01-21	2026-03-02

Every Year

Nights at or below -10 C (14 F) per year in Boston
Year	Days	First date	Last date	Longest streak in year	Coverage
2026	15	21 January 2026	2 March 2026	10 days	Incomplete, not ranked
2025	9	21 January 2025	26 December 2025	2 days	Complete
2024	2	22 December 2024	23 December 2024	2 days	Complete
2023	3	3 February 2023	25 February 2023	2 days	Complete
2022	14	11 January 2022	24 December 2022	2 days	Complete
2021	5	29 January 2021	2 March 2021	3 days	Complete
2020	1	15 February 2020	15 February 2020	1 days	Complete
2019	7	20 January 2019	27 February 2019	3 days	Complete
2018	8	1 January 2018	3 February 2018	3 days	Complete
2017	13	8 January 2017	31 December 2017	7 days	Complete
2016	7	5 January 2016	16 December 2016	5 days	Complete
2015	26	7 January 2015	6 March 2015	5 days	Complete
2014	15	2 January 2014	6 March 2014	4 days	Complete
2013	9	2 January 2013	17 December 2013	5 days	Complete
2012	4	3 January 2012	16 January 2012	2 days	Complete
2011	9	17 January 2011	3 March 2011	3 days	Complete
2010	8	9 January 2010	10 December 2010	3 days	Complete
2009	15	1 January 2009	30 December 2009	4 days	Complete
2008	8	2 January 2008	31 December 2008	3 days	Complete
2007	16	17 January 2007	9 March 2007	4 days	Complete
2006	6	15 January 2006	27 February 2006	2 days	Complete
2005	16	17 January 2005	15 December 2005	8 days	Complete
2004	20	8 January 2004	28 December 2004	5 days	Complete
2003	23	15 January 2003	7 March 2003	5 days	Complete
2002	3	11 February 2002	9 December 2002	2 days	Complete
2001	5	10 January 2001	22 February 2001	2 days	Complete
2000	17	13 January 2000	26 December 2000	11 days	Complete
1999	10	1 January 1999	25 December 1999	3 days	Complete
1998	7	1 January 1998	31 December 1998	4 days	Complete
1997	7	1 January 1997	31 December 1997	3 days	Complete
1996	16	4 January 1996	31 December 1996	4 days	Complete
1995	11	11 January 1995	26 February 1995	5 days	Complete
1994	28	6 January 1994	30 December 1994	9 days	Complete
1993	17	30 January 1993	31 December 1993	4 days	Complete
1992	15	16 January 1992	27 December 1992	4 days	Complete
1991	12	8 January 1991	19 December 1991	3 days	Complete
1990	5	22 January 1990	7 March 1990	3 days	Complete
1989	27	4 January 1989	29 December 1989	7 days	Complete
1988	17	5 January 1988	17 December 1988	4 days	Complete
1987	15	24 January 1987	31 December 1987	5 days	Complete
1986	11	7 January 1986	21 March 1986	3 days	Complete
1985	19	8 January 1985	26 December 1985	5 days	Complete
1984	17	11 January 1984	27 December 1984	4 days	Complete
1983	15	4 January 1983	27 December 1983	4 days	Complete
1982	21	10 January 1982	14 December 1982	4 days	Complete
1981	22	1 January 1981	21 December 1981	8 days	Complete
1980	23	4 January 1980	31 December 1980	7 days	Complete
1979	21	11 January 1979	20 December 1979	11 days	Complete
1978	7	10 January 1978	11 February 1978	3 days	Complete
1977	17	1 January 1977	12 December 1977	4 days	Complete
1976	20	5 January 1976	22 December 1976	3 days	Complete
1975	12	21 January 1975	25 December 1975	3 days	Complete
1974	10	12 January 1974	15 February 1974	3 days	Complete
1973	15	6 January 1973	19 December 1973	4 days	Complete
1972	11	1 January 1972	17 December 1972	4 days	Complete
1971	20	8 January 1971	19 December 1971	6 days	Complete
1970	19	8 January 1970	23 December 1970	6 days	Complete
1969	7	1 January 1969	25 December 1969	2 days	Complete
1968	31	1 January 1968	27 December 1968	7 days	Complete
1967	15	18 January 1967	19 March 1967	3 days	Complete
1966	14	8 January 1966	4 December 1966	3 days	Complete
1965	19	14 January 1965	20 December 1965	6 days	Complete
1964	14	1 January 1964	19 December 1964	4 days	Complete
1963	28	1 January 1963	31 December 1963	3 days	Complete
1962	26	4 January 1962	31 December 1962	6 days	Complete
1961	19	19 January 1961	30 December 1961	16 days	Complete
1960	15	9 January 1960	28 December 1960	4 days	Complete
1959	22	5 January 1959	23 December 1959	4 days	Complete
1958	22	4 January 1958	26 December 1958	6 days	Complete
1957	15	1 January 1957	12 February 1957	7 days	Complete
1956	8	1 January 1956	31 December 1956	5 days	Complete
1955	15	21 January 1955	31 December 1955	4 days	Complete
1954	16	8 January 1954	13 February 1954	7 days	Complete
1953	7	1 February 1953	19 December 1953	2 days	Complete
1952	7	22 January 1952	28 December 1952	3 days	Complete
1951	12	9 January 1951	28 December 1951	3 days	Complete
1950	21	8 January 1950	28 December 1950	3 days	Complete
1949	5	15 January 1949	20 March 1949	2 days	Complete
1948	33	10 January 1948	27 December 1948	5 days	Complete
1947	17	1 January 1947	30 December 1947	4 days	Complete
1946	29	3 January 1946	31 December 1946	7 days	Complete
1945	20	6 January 1945	23 December 1945	4 days	Complete
1944	21	8 January 1944	29 December 1944	3 days	Complete
1943	29	4 January 1943	29 December 1943	7 days	Complete
1942	26	6 January 1942	22 December 1942	7 days	Complete
1941	17	7 January 1941	22 December 1941	4 days	Complete
1940	20	1 January 1940	4 December 1940	6 days	Complete
1939	17	18 January 1939	28 December 1939	3 days	Complete
1938	20	1 January 1938	29 December 1938	5 days	Complete
1937	3	2 February 1937	4 February 1937	3 days	Complete
1936	32	23 January 1936	23 December 1936	12 days	Complete

Decade averages for Nights at or below -10 C (14 F) in Boston
Decade	Average days per year	Years counted
1930s	18.0	4
1940s	21.7	10
1950s	14.5	10
1960s	18.8	10
1970s	15.2	10
1980s	18.7	10
1990s	12.8	10
2000s	12.9	10
2010s	10.6	10
2020s	5.7	6

Compare with your own threshold in the threshold explorer. Fahrenheit thresholds are converted to tenths of a degree Celsius once, rounding half up.

Download the Data

Data for Nights at or below -10 C (14 F) in Boston, by year: CSV or JSON. Field meanings are on the data page.

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 from the threaded city record.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).