Asosan Threshold Days by Year

9 fixed thresholds counted per year at Asosan (JA000047821): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Asosan Thresholds

Asosan: days with a maximum temperature at or below 0 C (32 F) in 52 years, most in 1984 with 57.
Asosan: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1987 with 97.
Asosan: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1987 with 54.
Asosan: days with 50 mm (1.97 in) or more of precipitation in 50 years, most in 1980 with 31.
9 fixed thresholds have at least one qualifying day at Asosan.

Nights at or below 0 C (32 F)

39 years with a qualifying day

Days per year at Asosan with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 117 in 1970.

Nights at or below 0 C (32 F) per year at Asosan
Year	Days	Decade average
1951	100	91.2
1952	99	91.2
1953	95	91.2
1954	82	91.2
1955	82	91.2
1956	111	91.2
1957	98	91.2
1958	82	91.2
1959	72	91.2
1960	94	102.7
1961	94	102.7
1962	102	102.7
1963	105	102.7
1964	97	102.7
1965	113	102.7
1966	103	102.7
1967	109	102.7
1968	101	102.7
1969	109	102.7
1970	117	102.7
1971	95	102.7
1972	95	102.7
1973	112	102.7
1974	110	102.7
1975	104	102.7
1976	108	102.7
1977	89	102.7
1978	101	102.7
1979	96	102.7
1980	111	103.1
1981	107	103.1
1982	101	103.1
1983	107	103.1
1984	108	103.1
1985	101	103.1
1986	103	103.1
1987	98	103.1
1988	109	103.1
1989	86	103.1

For each year, a bar from the first to the last day at Asosan meeting 0 C (32 F).

First to last qualifying date each year at Asosan
Year	First date	Last date
1951	1951-01-01	1951-12-30
1952	1952-01-01	1952-12-30
1953	1953-01-01	1953-12-31
1954	1954-01-01	1954-12-31
1955	1955-01-01	1955-12-31
1956	1956-01-01	1956-12-30
1957	1957-01-05	1957-12-31
1958	1958-01-01	1958-12-30
1959	1959-01-02	1959-12-30
1960	1960-01-01	1960-12-31
1961	1961-01-01	1961-12-31
1962	1962-01-02	1962-12-31
1963	1963-01-01	1963-12-31
1964	1964-01-01	1964-12-29
1965	1965-01-01	1965-12-31
1966	1966-01-01	1966-12-30
1967	1967-01-01	1967-12-31
1968	1968-01-01	1968-12-31
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-31
1971	1971-01-01	1971-12-29
1972	1972-01-01	1972-12-31
1973	1973-01-02	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-02	1975-12-31
1976	1976-01-01	1976-12-31
1977	1977-01-01	1977-12-29
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-30
1980	1980-01-04	1980-12-31
1981	1981-01-01	1981-12-31
1982	1982-01-01	1982-12-31
1983	1983-01-01	1983-12-31
1984	1984-01-01	1984-12-31
1985	1985-01-01	1985-12-31
1986	1986-01-01	1986-12-30
1987	1987-01-01	1987-12-31
1988	1988-01-05	1988-12-30
1989	1989-01-01	1989-12-31

Every Fixed Threshold

Fixed thresholds at Asosan
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
0 C (32 F): Ice days (max	52	57	1984	27
0 C (32 F): Frost days (min	39	117	1970	86
-10 C (14 F): Days with min	37	17	1963	4
20 C (68 F): Tropical nights (min	19	6	1978	1
10 mm (0.39 in): Days with 10 mm or more rain	50	97	1987	76
25 mm (0.98 in): Days with 25 mm or more rain	50	54	1987	35
50 mm (1.97 in): Days with 50 mm or more rain	50	31	1980	13
100 mm (3.94 in): Days with 100 mm or more rain	49	11	1954	2
200 mm (7.87 in): Days with 200 mm or more rain	24	4	1963	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

Download the Data

Data for Asosan 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

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

Asosan Threshold Days by Year

Key Facts for Asosan Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

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