Adak AP Threshold Days by Year (USW00025704)

9 fixed thresholds counted per year at Adak AP (USW00025704): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Adak AP Thresholds

Adak AP: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1954 with 71.
Adak AP: days with 25 mm (0.98 in) or more of precipitation in 55 years, most in 1955 with 25.
Adak AP: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1993 with 143.
Adak AP: days with a maximum temperature at or below 0 C (32 F) in 53 years, most in 1944 with 34.
9 fixed thresholds have at least one qualifying day at Adak AP.

Nights at or below 0 C (32 F)

54 years with a qualifying day

Days per year at Adak AP with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 143 in 1993.

Nights at or below 0 C (32 F) per year at Adak AP
Year	Days	Decade average
1943	123	115.5
1944	124	115.5
1945	111	115.5
1947	105	115.5
1948	105	115.5
1949	125	115.5
1950	95	100.2
1951	83	100.2
1952	117	100.2
1953	117	100.2
1954	94	100.2
1955	98	100.2
1956	105	100.2
1957	71	100.2
1958	111	100.2
1959	111	100.2
1960	115	111
1961	113	111
1962	90	111
1963	91	111
1964	133	111
1965	103	111
1966	117	111
1967	113	111
1968	107	111
1969	128	111
1970	97	115
1972	125	115
1973	131	115
1974	98	115
1975	118	115
1976	140	115
1977	128	115
1978	98	115
1979	100	115
1980	130	106.1
1981	105	106.1
1982	73	106.1
1983	117	106.1
1984	93	106.1
1985	100	106.1
1986	87	106.1
1987	111	106.1
1988	129	106.1
1989	116	106.1
1990	115	131
1991	128	131
1992	138	131
1993	143	131
2018	83	90
2019	97	90
2022	93	87
2023	101	87
2026	67	87

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

First to last qualifying date each year at Adak AP
Year	First date	Last date
1943	1943-01-02	1943-12-31
1944	1944-01-01	1944-12-31
1945	1945-01-01	1945-12-31
1947	1947-01-01	1947-12-31
1948	1948-01-01	1948-12-31
1949	1949-01-01	1949-12-24
1950	1950-01-08	1950-12-30
1951	1951-01-03	1951-12-31
1952	1952-01-01	1952-12-31
1953	1953-01-01	1953-12-31
1954	1954-01-01	1954-12-22
1955	1955-01-01	1955-12-31
1956	1956-01-08	1956-12-30
1957	1957-01-04	1957-12-31
1958	1958-01-01	1958-12-29
1959	1959-01-04	1959-12-31
1960	1960-01-01	1960-12-29
1961	1961-01-03	1961-12-31
1962	1962-01-01	1962-12-31
1963	1963-01-02	1963-12-31
1964	1964-01-01	1964-12-26
1965	1965-01-01	1965-12-25
1966	1966-01-03	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-01	1968-12-24
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-31
1972	1972-01-01	1972-12-30
1973	1973-01-01	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-01	1975-12-27
1976	1976-01-01	1976-12-28
1977	1977-01-01	1977-12-30
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-31
1981	1981-01-01	1981-12-29
1982	1982-01-05	1982-12-31
1983	1983-01-01	1983-12-31
1984	1984-01-01	1984-12-28
1985	1985-01-01	1985-12-31
1986	1986-01-01	1986-12-31
1987	1987-01-01	1987-12-30
1988	1988-01-01	1988-12-31
1989	1989-01-01	1989-12-29
1990	1990-01-02	1990-12-31
1991	1991-01-01	1991-12-31
1992	1992-01-01	1992-12-31
1993	1993-01-01	1993-12-29
2018	2018-01-01	2018-12-31
2019	2019-01-01	2019-12-31
2022	2022-01-01	2022-12-30
2023	2023-01-01	2023-12-31
2026	2026-01-08	2026-05-05

Every Fixed Threshold

Fixed thresholds at Adak AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
0 C (32 F): Ice days (max	53	34	1944	8
0 C (32 F): Frost days (min	54	143	1993	67
-10 C (14 F): Days with min	36	7	1967	2
10 mm (0.39 in): Days with 10 mm or more rain	56	71	1954	5
25 mm (0.98 in): Days with 25 mm or more rain	55	25	1955	3
50 mm (1.97 in): Days with 50 mm or more rain	32	8	1955	1
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1954	1
10 cm (3.9 in): Days with 10 cm or more snowfall	45	10	1964	2
25 cm (9.8 in): Days with 25 cm or more snowfall	5	2	1988	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1943.

Download the Data

Data for Adak AP 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Adak AP Threshold Days by Year (USW00025704)

Key Facts for Adak AP Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

Related