Boylston Threshold Days by Year

7 fixed thresholds counted per year at Boylston (USC00190801): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boylston Thresholds

Boylston: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1983 with 57.
Boylston: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1927 with 22.
Boylston: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 1936 with 9.
Boylston: days with 10 cm (3.9 in) or more of snowfall in 34 years, most in 1948 with 10.
7 fixed thresholds have at least one qualifying day at Boylston.

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

46 years with a qualifying day

Days per year at Boylston with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1983.

Days with 10 mm (0.39 in) or more of precipitation per year at Boylston
Year	Days	Decade average
1896	37	38.3
1897	40	38.3
1899	38	38.3
1905	39	34.4
1906	40	34.4
1907	30	34.4
1908	31	34.4
1909	32	34.4
1912	38	33.6
1913	29	33.6
1914	31	33.6
1915	38	33.6
1916	32	33.6
1920	38	37.2
1921	36	37.2
1922	38	37.2
1923	35	37.2
1926	36	37.2
1927	40	37.2
1931	34	35.3
1933	39	35.3
1935	30	35.3
1936	35	35.3
1938	34	35.3
1939	40	35.3
1940	37	35.4
1941	22	35.4
1942	48	35.4
1943	35	35.4
1944	30	35.4
1945	46	35.4
1946	36	35.4
1947	36	35.4
1948	29	35.4
1957	19	19
1974	26	32
1976	29	32
1977	38	32
1978	28	32
1979	39	32
1980	27	39.8
1981	43	39.8
1982	39	39.8
1983	57	39.8
1984	42	39.8
1985	31	39.8

For each year, a bar from the first to the last day at Boylston meeting 10 mm (0.39 in).

First to last qualifying date each year at Boylston
Year	First date	Last date
1896	1896-01-25	1896-12-16
1897	1897-01-05	1897-12-31
1899	1899-01-07	1899-12-24
1905	1905-01-04	1905-12-29
1906	1906-01-04	1906-12-31
1907	1907-01-26	1907-12-30
1908	1908-01-08	1908-12-31
1909	1909-01-06	1909-12-26
1912	1912-01-09	1912-12-30
1913	1913-01-03	1913-12-26
1914	1914-01-21	1914-12-21
1915	1915-01-07	1915-12-29
1916	1916-01-02	1916-12-22
1920	1920-01-10	1920-12-27
1921	1921-01-06	1921-11-29
1922	1922-01-11	1922-12-29
1923	1923-01-01	1923-12-28
1926	1926-01-09	1926-12-28
1927	1927-01-04	1927-12-29
1931	1931-01-06	1931-12-25
1933	1933-01-09	1933-12-27
1935	1935-01-01	1935-12-16
1936	1936-01-03	1936-12-20
1938	1938-01-02	1938-12-27
1939	1939-01-06	1939-12-20
1940	1940-01-13	1940-12-30
1941	1941-01-04	1941-12-24
1942	1942-01-02	1942-12-31
1943	1943-01-19	1943-12-27
1944	1944-01-07	1944-12-28
1945	1945-01-02	1945-12-31
1946	1946-01-10	1946-12-30
1947	1947-01-04	1947-12-27
1948	1948-01-03	1948-12-20
1957	1957-01-07	1957-12-21
1974	1974-01-22	1974-12-25
1976	1976-01-08	1976-12-29
1977	1977-01-08	1977-12-22
1978	1978-01-14	1978-12-25
1979	1979-01-03	1979-12-25
1980	1980-01-12	1980-11-29
1981	1981-02-03	1981-12-28
1982	1982-01-02	1982-12-25
1983	1983-01-07	1983-12-29
1984	1984-01-11	1984-12-22
1985	1985-02-13	1985-12-14

Every Fixed Threshold

Fixed thresholds at Boylston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	46	57	1983	31
25 mm (0.98 in): Days with 25 mm or more rain	46	22	1927	10
50 mm (1.97 in): Days with 50 mm or more rain	42	9	1936	1
100 mm (3.94 in): Days with 100 mm or more rain	11	2	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	34	10	1948	1
25 cm (9.8 in): Days with 25 cm or more snowfall	19	3	1983	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	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 1896.

Download the Data

Data for Boylston threshold days 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 2026-10-13 (13 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Boylston Threshold Days by Year

Key Facts for Boylston Thresholds

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

Every Fixed Threshold

Download the Data

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