San Haven Threshold Days by Year (USC00327824)

16 fixed thresholds counted per year at San Haven (USC00327824): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Haven Thresholds

San Haven: days with a maximum temperature at or above 30 C (86 F) in 34 years, most in 1961 with 44.
San Haven: days with a maximum temperature at or above 90 F (32.2 C) in 34 years, most in 1961 with 21.
San Haven: days with a maximum temperature at or below 0 C (32 F) in 34 years, most in 1955 with 129.
San Haven: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1968 with 21.
16 fixed thresholds have at least one qualifying day at San Haven.

Days at or above 30 C (86 F)

34 years with a qualifying day

Days per year at San Haven with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 44 in 1961.

Days at or above 30 C (86 F) per year at San Haven
Year	Days	Decade average
1952	23	17.8
1953	16	17.8
1954	8	17.8
1955	21	17.8
1956	10	17.8
1957	19	17.8
1958	16	17.8
1959	29	17.8
1960	28	18.5
1961	44	18.5
1962	4	18.5
1963	18	18.5
1964	11	18.5
1965	5	18.5
1966	21	18.5
1967	24	18.5
1968	8	18.5
1969	22	18.5
1970	22	13.9
1971	11	13.9
1972	15	13.9
1973	12	13.9
1974	14	13.9
1975	11	13.9
1976	13	13.9
1977	10	13.9
1978	17	13.9
1979	14	13.9
1980	23	20.2
1981	19	20.2
1982	6	20.2
1983	34	20.2
1984	30	20.2
1985	9	20.2

For each year, a bar from the first to the last day at San Haven meeting 30 C (86 F).

First to last qualifying date each year at San Haven
Year	First date	Last date
1952	1952-04-26	1952-09-27
1953	1953-06-11	1953-08-31
1954	1954-06-23	1954-09-01
1955	1955-07-17	1955-09-05
1956	1956-05-21	1956-08-15
1957	1957-07-01	1957-08-10
1958	1958-06-27	1958-09-01
1959	1959-06-03	1959-08-28
1960	1960-05-13	1960-09-20
1961	1961-06-04	1961-08-31
1962	1962-06-27	1962-08-22
1963	1963-06-28	1963-10-04
1964	1964-05-20	1964-08-05
1965	1965-08-04	1965-08-13
1966	1966-05-21	1966-09-12
1967	1967-06-29	1967-09-06
1968	1968-06-03	1968-07-13
1969	1969-05-26	1969-09-14
1970	1970-05-17	1970-09-06
1971	1971-08-07	1971-09-02
1972	1972-05-16	1972-08-31
1973	1973-06-02	1973-08-31
1974	1974-06-20	1974-08-07
1975	1975-07-05	1975-07-31
1976	1976-07-06	1976-09-18
1977	1977-05-11	1977-07-24
1978	1978-06-15	1978-09-11
1979	1979-06-14	1979-09-17
1980	1980-04-21	1980-09-08
1981	1981-06-28	1981-09-11
1982	1982-07-17	1982-09-11
1983	1983-06-11	1983-09-03
1984	1984-05-17	1984-08-29
1985	1985-07-04	1985-08-09

Every Fixed Threshold

Fixed thresholds at San Haven
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	34	44	1961	9
35 C (95 F): Days	23	6	1961	4
90 F (32.2 C): Days	34	21	1961	3
100 F (37.8 C): Days	1	1	1973	1
0 C (32 F): Ice days (max	34	129	1955	87
0 C (32 F): Frost days (min	31	217	1983	184
-10 C (14 F): Days with min	31	130	1955	94
-20 C (-4 F): Days with min	31	72	1978	45
-30 C (-22 F): Days with min	31	28	1982	12
-40 C (-40 F): Days with min	4	1	1966	1
20 C (68 F): Tropical nights (min	12	3	1955	1
10 mm (0.39 in): Days with 10 mm or more rain	33	21	1968	10
25 mm (0.98 in): Days with 25 mm or more rain	28	8	1954	2
50 mm (1.97 in): Days with 50 mm or more rain	8	3	1980	3
10 cm (3.9 in): Days with 10 cm or more snowfall	20	6	1975	2
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1953	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1952.

Download the Data

Data for San Haven 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).

San Haven Threshold Days by Year (USC00327824)

Key Facts for San Haven Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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