Days with 10 mm (0.39 in) or more of precipitation in Boston

Boston has had days with 10 mm (0.39 in) or more of precipitation in 91 years, most in 1958 with 55. Days per year, season span, streaks and every date.

Key Facts for Boston

Boston has had days with 10 mm (0.39 in) or more of precipitation in 91 years, 3,208 days in all.
The most in one year was 55 days in 1958.
In 2026, the latest year on file, there were 16 such days.
The earliest first date in a year was 1 January 1938.
The latest last date in a year was 31 December 1972.
The longest run inside a single year was 7 days in 1938.
1 year with under 90 percent of days observed is left out of these rankings.

Days per Year

91 years, 3,208 days

Days per year in Boston with 10 mm (0.39 in) or more of precipitation. The line is the decade average. The most was 55 in 1958. Grey bars are years with under 90 percent of days observed, left out of rankings.

Days with 10 mm (0.39 in) or more of precipitation per year in Boston
Year	Days	Decade average
1936	38	36.8
1937	37	36.8
1938	42	36.8
1939	30	36.8
1940	30	31.7
1941	28	31.7
1942	37	31.7
1943	26	31.7
1944	27	31.7
1945	38	31.7
1946	31	31.7
1947	34	31.7
1948	38	31.7
1949	28	31.7
1950	23	40.8
1951	42	40.8
1952	39	40.8
1953	43	40.8
1954	45	40.8
1955	37	40.8
1956	47	40.8
1957	34	40.8
1958	55	40.8
1959	43	40.8
1960	34	32.8
1961	34	32.8
1962	33	32.8
1963	35	32.8
1964	34	32.8
1965	19	32.8
1966	31	32.8
1967	37	32.8
1968	33	32.8
1969	38	32.8
1970	35	34.4
1971	29	34.4
1972	51	34.4
1973	41	34.4
1974	29	34.4
1975	32	34.4
1976	33	34.4
1977	32	34.4
1978	30	34.4
1979	32	34.4
1980	22	34.6
1981	33	34.6
1982	35	34.6
1983	49	34.6
1984	41	34.6
1985	26	34.6
1986	39	34.6
1987	37	34.6
1988	28	34.6
1989	36	34.6
1990	45	34.5
1991	33	34.5
1992	35	34.5
1993	36	34.5
1994	38	34.5
1995	28	34.5
1996	36	34.5
1997	30	34.5
1998	38	34.5
1999	26	34.5
2000	42	37.5
2001	26	37.5
2002	34	37.5
2003	40	37.5
2004	37	37.5
2005	39	37.5
2006	38	37.5
2007	32	37.5
2008	46	37.5
2009	41	37.5
2010	37	37.2
2011	51	37.2
2012	35	37.2
2013	31	37.2
2014	35	37.2
2015	29	37.2
2016	28	37.2
2017	38	37.2
2018	48	37.2
2019	40	37.2
2020	33	32.3
2021	42	32.3
2022	30	32.3
2023	37	32.3
2024	38	32.3
2025	30	32.3
2026	16	32.3

Season Span

earliest 1 January, latest 31 December

For each year, a bar from the first to the last day in Boston meeting 10 mm (0.39 in). Long bars mean a long season.

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

Every Year

Days with 10 mm (0.39 in) or more of precipitation per year in Boston
Year	Days	First date	Last date	Longest streak in year	Coverage
2026	16	25 January 2026	11 October 2026	3 days	Incomplete, not ranked
2025	30	1 January 2025	29 December 2025	2 days	Complete
2024	38	7 January 2024	30 December 2024	3 days	Complete
2023	37	3 January 2023	28 December 2023	2 days	Complete
2022	30	7 January 2022	23 December 2022	2 days	Complete
2021	42	2 January 2021	18 December 2021	3 days	Complete
2020	33	25 January 2020	25 December 2020	2 days	Complete
2019	40	5 January 2019	30 December 2019	2 days	Complete
2018	48	4 January 2018	31 December 2018	3 days	Complete
2017	38	3 January 2017	25 December 2017	2 days	Complete
2016	28	10 January 2016	29 December 2016	2 days	Complete
2015	29	3 January 2015	29 December 2015	2 days	Complete
2014	35	11 January 2014	24 December 2014	3 days	Complete
2013	31	8 February 2013	29 December 2013	2 days	Complete
2012	35	12 January 2012	29 December 2012	2 days	Complete
2011	51	12 January 2011	23 December 2011	2 days	Complete
2010	37	2 January 2010	27 December 2010	3 days	Complete
2009	41	7 January 2009	20 December 2009	2 days	Complete
2008	46	11 January 2008	31 December 2008	3 days	Complete
2007	32	1 January 2007	31 December 2007	3 days	Complete
2006	38	14 January 2006	23 December 2006	3 days	Complete
2005	39	6 January 2005	26 December 2005	3 days	Complete
2004	37	3 February 2004	23 December 2004	3 days	Complete
2003	40	1 January 2003	15 December 2003	2 days	Complete
2002	34	13 January 2002	25 December 2002	2 days	Complete
2001	26	30 January 2001	24 December 2001	2 days	Complete
2000	42	4 January 2000	30 December 2000	2 days	Complete
1999	26	3 January 1999	7 December 1999	2 days	Complete
1998	38	7 January 1998	29 December 1998	3 days	Complete
1997	30	16 January 1997	29 December 1997	2 days	Complete
1996	36	3 January 1996	19 December 1996	3 days	Complete
1995	28	1 January 1995	20 December 1995	2 days	Complete
1994	38	4 January 1994	24 December 1994	2 days	Complete
1993	36	5 January 1993	30 December 1993	2 days	Complete
1992	35	4 January 1992	17 December 1992	2 days	Complete
1991	33	9 January 1991	29 December 1991	2 days	Complete
1990	45	21 January 1990	28 December 1990	2 days	Complete
1989	36	15 February 1989	16 November 1989	3 days	Complete
1988	28	4 January 1988	24 December 1988	2 days	Complete
1987	37	2 January 1987	15 December 1987	3 days	Complete
1986	39	3 January 1986	25 December 1986	3 days	Complete
1985	26	6 February 1985	28 November 1985	2 days	Complete
1984	41	11 January 1984	22 December 1984	3 days	Complete
1983	49	6 January 1983	28 December 1983	5 days	Complete
1982	35	1 January 1982	13 November 1982	4 days	Complete
1981	33	2 February 1981	27 December 1981	3 days	Complete
1980	22	16 February 1980	16 December 1980	2 days	Complete
1979	32	2 January 1979	13 December 1979	3 days	Complete
1978	30	9 January 1978	25 December 1978	3 days	Complete
1977	32	7 January 1977	21 December 1977	2 days	Complete
1976	33	7 January 1976	29 December 1976	3 days	Complete
1975	32	7 January 1975	26 December 1975	5 days	Complete
1974	29	9 January 1974	25 December 1974	2 days	Complete
1973	41	29 January 1973	26 December 1973	3 days	Complete
1972	51	3 February 1972	31 December 1972	3 days	Complete
1971	29	1 January 1971	30 December 1971	2 days	Complete
1970	35	3 February 1970	24 December 1970	3 days	Complete
1969	38	7 January 1969	27 December 1969	3 days	Complete
1968	33	7 January 1968	28 December 1968	2 days	Complete
1967	37	27 January 1967	31 December 1967	3 days	Complete
1966	31	2 January 1966	29 December 1966	2 days	Complete
1965	19	16 January 1965	13 December 1965	1 days	Complete
1964	34	1 January 1964	27 December 1964	2 days	Complete
1963	35	12 January 1963	24 December 1963	3 days	Complete
1962	33	6 January 1962	29 December 1962	3 days	Complete
1961	34	1 January 1961	28 December 1961	2 days	Complete
1960	34	3 January 1960	29 December 1960	2 days	Complete
1959	43	2 January 1959	29 December 1959	3 days	Complete
1958	55	1 January 1958	4 December 1958	3 days	Complete
1957	34	7 January 1957	29 December 1957	3 days	Complete
1956	47	3 January 1956	29 December 1956	6 days	Complete
1955	37	2 January 1955	4 December 1955	3 days	Complete
1954	45	3 January 1954	30 December 1954	3 days	Complete
1953	43	3 January 1953	14 December 1953	3 days	Complete
1952	39	3 January 1952	23 December 1952	2 days	Complete
1951	42	7 January 1951	30 December 1951	3 days	Complete
1950	23	6 January 1950	29 December 1950	2 days	Complete
1949	28	5 January 1949	29 November 1949	3 days	Complete
1948	38	2 January 1948	19 December 1948	2 days	Complete
1947	34	2 January 1947	26 December 1947	4 days	Complete
1946	31	21 January 1946	29 December 1946	2 days	Complete
1945	38	1 January 1945	31 December 1945	2 days	Complete
1944	27	6 January 1944	27 December 1944	2 days	Complete
1943	26	4 January 1943	27 December 1943	3 days	Complete
1942	37	2 January 1942	30 December 1942	3 days	Complete
1941	28	4 January 1941	24 December 1941	2 days	Complete
1940	30	15 January 1940	28 December 1940	4 days	Complete
1939	30	6 January 1939	30 December 1939	2 days	Complete
1938	42	1 January 1938	10 December 1938	7 days	Complete
1937	37	2 January 1937	18 December 1937	2 days	Complete
1936	38	3 January 1936	20 December 1936	3 days	Complete

Decade averages for Days with 10 mm (0.39 in) or more of precipitation in Boston
Decade	Average days per year	Years counted
1930s	36.8	4
1940s	31.7	10
1950s	40.8	10
1960s	32.8	10
1970s	34.4	10
1980s	34.6	10
1990s	34.5	10
2000s	37.5	10
2010s	37.2	10
2020s	35.0	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 Days with 10 mm (0.39 in) or more of precipitation 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).