Ackerly 4SE Threshold Days by Year (USC00410034)

5 fixed thresholds counted per year at Ackerly 4SE (USC00410034): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ackerly 4SE Thresholds

Ackerly 4SE: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1941 with 27.
Ackerly 4SE: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 1941 with 10.
Ackerly 4SE: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 1991 with 4.
Ackerly 4SE: days with 10 cm (3.9 in) or more of snowfall in 9 years, most in 1968 with 2.
5 fixed thresholds have at least one qualifying day at Ackerly 4SE.

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

56 years with a qualifying day

Days per year at Ackerly 4SE with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 27 in 1941.

Days with 10 mm (0.39 in) or more of precipitation per year at Ackerly 4SE
Year	Days	Decade average
1941	27	13.7
1942	15	13.7
1943	7	13.7
1946	8	13.7
1947	12	13.7
1948	12	13.7
1949	15	13.7
1951	6	11.9
1952	11	11.9
1953	9	11.9
1954	5	11.9
1955	15	11.9
1956	6	11.9
1957	20	11.9
1958	19	11.9
1959	16	11.9
1960	9	14
1961	19	14
1962	14	14
1963	7	14
1964	10	14
1965	12	14
1966	14	14
1967	11	14
1968	20	14
1969	24	14
1970	14	15.6
1971	16	15.6
1972	23	15.6
1975	16	15.6
1976	17	15.6
1977	11	15.6
1978	15	15.6
1979	13	15.6
1980	9	13.7
1981	17	13.7
1982	9	13.7
1983	7	13.7
1984	15	13.7
1985	16	13.7
1986	17	13.7
1987	23	13.7
1988	18	13.7
1989	6	13.7
1990	16	15.7
1991	21	15.7
1992	19	15.7
1993	18	15.7
1994	11	15.7
1995	17	15.7
1996	12	15.7
1997	17	15.7
1998	8	15.7
1999	18	15.7
2000	11	9
2001	7	9

For each year, a bar from the first to the last day at Ackerly 4SE meeting 10 mm (0.39 in).

First to last qualifying date each year at Ackerly 4SE
Year	First date	Last date
1941	1941-01-31	1941-10-30
1942	1942-04-09	1942-12-20
1943	1943-03-24	1943-11-26
1946	1946-04-23	1946-12-11
1947	1947-03-18	1947-12-03
1948	1948-05-25	1948-10-09
1949	1949-01-11	1949-10-23
1951	1951-03-26	1951-10-28
1952	1952-04-20	1952-12-19
1953	1953-03-08	1953-10-23
1954	1954-04-12	1954-10-06
1955	1955-03-20	1955-10-01
1956	1956-04-05	1956-12-19
1957	1957-02-07	1957-11-03
1958	1958-01-04	1958-10-29
1959	1959-03-28	1959-12-17
1960	1960-01-05	1960-12-10
1961	1961-01-11	1961-11-14
1962	1962-03-14	1962-12-24
1963	1963-04-04	1963-11-19
1964	1964-01-29	1964-12-10
1965	1965-02-09	1965-10-17
1966	1966-03-28	1966-09-15
1967	1967-04-12	1967-12-15
1968	1968-01-18	1968-11-27
1969	1969-02-21	1969-12-28
1970	1970-03-06	1970-10-16
1971	1971-04-16	1971-10-02
1972	1972-01-31	1972-10-31
1975	1975-05-09	1975-12-24
1976	1976-04-12	1976-11-13
1977	1977-01-12	1977-08-28
1978	1978-01-31	1978-11-04
1979	1979-01-26	1979-12-23
1980	1980-01-22	1980-09-23
1981	1981-02-28	1981-11-08
1982	1982-04-22	1982-08-17
1983	1983-04-20	1983-11-22
1984	1984-06-14	1984-12-31
1985	1985-02-20	1985-10-17
1986	1986-04-19	1986-12-21
1987	1987-02-05	1987-12-25
1988	1988-03-02	1988-12-10
1989	1989-01-27	1989-09-12
1990	1990-01-18	1990-12-16
1991	1991-05-02	1991-12-20
1992	1992-01-17	1992-11-21
1993	1993-01-19	1993-12-22
1994	1994-04-29	1994-11-19
1995	1995-02-11	1995-10-02
1996	1996-04-05	1996-11-29
1997	1997-02-20	1997-12-21
1998	1998-03-16	1998-11-01
1999	1999-01-29	1999-10-08
2000	2000-01-08	2000-10-24
2001	2001-03-01	2001-11-27

Every Fixed Threshold

Fixed thresholds at Ackerly 4SE
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	56	27	1941	7
25 mm (0.98 in): Days with 25 mm or more rain	56	10	1941	2
50 mm (1.97 in): Days with 50 mm or more rain	36	4	1991	1
100 mm (3.94 in): Days with 100 mm or more rain	8	1	1941	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	2	1968	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

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Data for Ackerly 4SE 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Ackerly 4SE Threshold Days by Year (USC00410034)

Key Facts for Ackerly 4SE Thresholds

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

Every Fixed Threshold

Download the Data

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