Blackwells Mills Threshold Days by Year (USC00280847)

7 fixed thresholds counted per year at Blackwells Mills (USC00280847): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Blackwells Mills Thresholds

Blackwells Mills: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1983 with 58.
Blackwells Mills: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1983 with 27.
Blackwells Mills: days with 50 mm (1.97 in) or more of precipitation in 33 years, most in 2011 with 7.
Blackwells Mills: days with 10 cm (3.9 in) or more of snowfall in 11 years, most in 2015 with 5.
7 fixed thresholds have at least one qualifying day at Blackwells Mills.

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

36 years with a qualifying day

Days per year at Blackwells Mills with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1983.

Days with 10 mm (0.39 in) or more of precipitation per year at Blackwells Mills
Year	Days	Decade average
1957	37	39
1958	45	39
1959	35	39
1960	35	33.3
1961	42	33.3
1962	37	33.3
1963	30	33.3
1964	32	33.3
1965	23	33.3
1966	33	33.3
1968	32	33.3
1969	36	33.3
1970	41	42.1
1971	32	42.1
1972	51	42.1
1973	48	42.1
1975	55	42.1
1976	33	42.1
1978	35	42.1
1980	26	38.1
1981	37	38.1
1982	38	38.1
1983	58	38.1
1984	42	38.1
1985	28	38.1
1986	38	38.1
1997	34	34
2011	46	39
2012	29	39
2013	46	39
2014	43	39
2015	36	39
2016	34	39
2017	39	39
2021	34	38.5
2023	43	38.5

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

First to last qualifying date each year at Blackwells Mills
Year	First date	Last date
1957	1957-01-10	1957-12-27
1958	1958-01-15	1958-12-30
1959	1959-01-02	1959-12-29
1960	1960-01-03	1960-12-30
1961	1961-01-01	1961-12-24
1962	1962-01-07	1962-12-22
1963	1963-01-20	1963-12-24
1964	1964-01-10	1964-12-28
1965	1965-01-11	1965-12-26
1966	1966-01-03	1966-12-29
1968	1968-01-15	1968-12-23
1969	1969-01-24	1969-12-31
1970	1970-02-03	1970-12-17
1971	1971-01-02	1971-11-30
1972	1972-01-03	1972-12-22
1973	1973-01-04	1973-12-27
1975	1975-01-07	1975-12-31
1976	1976-01-01	1976-12-08
1978	1978-01-09	1978-12-25
1980	1980-01-12	1980-11-25
1981	1981-01-07	1981-12-16
1982	1982-01-04	1982-12-17
1983	1983-01-06	1983-12-29
1984	1984-01-11	1984-12-22
1985	1985-01-05	1985-12-01
1986	1986-01-20	1986-12-25
1997	1997-01-10	1997-12-30
2011	2011-01-18	2011-12-23
2012	2012-01-02	2012-12-27
2013	2013-01-12	2013-12-30
2014	2014-01-04	2014-12-25
2015	2015-01-04	2015-12-29
2016	2016-01-10	2016-12-12
2017	2017-01-03	2017-11-19
2021	2021-01-16	2021-10-30
2023	2023-01-04	2023-12-28

Every Fixed Threshold

Fixed thresholds at Blackwells Mills
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	36	58	1983	43
25 mm (0.98 in): Days with 25 mm or more rain	36	27	1983	13
50 mm (1.97 in): Days with 50 mm or more rain	33	7	2011	2
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1959	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1975	1
10 cm (3.9 in): Days with 10 cm or more snowfall	11	5	2015	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1969	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.

Download the Data

Data for Blackwells Mills 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Blackwells Mills Threshold Days by Year (USC00280847)

Key Facts for Blackwells Mills Thresholds

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

Every Fixed Threshold

Download the Data

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