Adak AP Weather Records (USW00025704)
Record envelope, standing records and threshold days for Adak AP (USW00025704), Alaska, United States, with 85 years of record.
Key Facts for Adak AP
- Adak AP (USW00025704) is a weather station in Alaska, United States at 51.88 latitude and -176.65 longitude, 5 m (17 ft) above sea level.
- The station reports from 1942 to 2026, 85 years of record.
- 1,464 records set at Adak AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Adak AP set a daily record high maximum temperature of 20.6 C (69.1 F) on 30 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Alaska, United States, 51.88 latitude, -176.65 longitude.
- Elevation: 5 m (17 ft).
- Period of record: 1942 to 2026, 85 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
24 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 11.1 C (52.0 F) | -16.1 C (3.0 F) | 9.4 C (48.9 F) | -8.3 C (17.1 F) |
| Feb | 12.2 C (54.0 F) | -16.1 C (3.0 F) | 10.6 C (51.1 F) | -8.9 C (16.0 F) |
| Mar | 13.9 C (57.0 F) | -11.7 C (10.9 F) | 11.7 C (53.1 F) | -6.7 C (19.9 F) |
| Apr | 13.3 C (55.9 F) | -6.7 C (19.9 F) | 10.0 C (50.0 F) | -2.8 C (27.0 F) |
| May | 18.3 C (64.9 F) | -6.7 C (19.9 F) | 8.3 C (46.9 F) | -1.1 C (30.0 F) |
| Jun | 19.4 C (66.9 F) | -1.7 C (28.9 F) | 13.9 C (57.0 F) | 0.6 C (33.1 F) |
| Jul | 22.8 C (73.0 F) | 0.6 C (33.1 F) | 21.7 C (71.1 F) | 2.8 C (37.0 F) |
| Aug | 23.9 C (75.0 F) | 0.6 C (33.1 F) | 21.1 C (70.0 F) | 5.6 C (42.1 F) |
| Sep | 21.7 C (71.1 F) | -2.2 C (28.0 F) | 15.0 C (59.0 F) | 4.4 C (39.9 F) |
| Oct | 17.2 C (63.0 F) | -5.6 C (21.9 F) | 12.8 C (55.0 F) | 2.8 C (37.0 F) |
| Nov | 17.2 C (63.0 F) | -11.1 C (12.0 F) | n/a | n/a |
| Dec | 12.8 C (55.0 F) | -13.3 C (8.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1942 | 8 |
| 1943 | 40 |
| 1944 | 35 |
| 1945 | 12 |
| 1946 | 21 |
| 1947 | 29 |
| 1948 | 20 |
| 1949 | 38 |
| 1950 | 19 |
| 1951 | 11 |
| 1952 | 33 |
| 1953 | 19 |
| 1954 | 19 |
| 1955 | 25 |
| 1956 | 29 |
| 1957 | 26 |
| 1958 | 18 |
| 1959 | 21 |
| 1960 | 18 |
| 1961 | 21 |
| 1962 | 46 |
| 1963 | 22 |
| 1964 | 42 |
| 1965 | 32 |
| 1966 | 15 |
| 1967 | 41 |
| 1968 | 24 |
| 1969 | 20 |
| 1970 | 22 |
| 1971 | 62 |
| 1972 | 37 |
| 1973 | 27 |
| 1974 | 10 |
| 1975 | 26 |
| 1976 | 24 |
| 1977 | 5 |
| 1978 | 8 |
| 1979 | 23 |
| 1980 | 16 |
| 1981 | 13 |
| 1982 | 30 |
| 1983 | 14 |
| 1984 | 17 |
| 1985 | 21 |
| 1986 | 10 |
| 1987 | 14 |
| 1988 | 9 |
| 1989 | 16 |
| 1990 | 12 |
| 1991 | 21 |
| 1992 | 16 |
| 1993 | 24 |
| 1994 | 17 |
| 1995 | 12 |
| 1996 | 12 |
| 1997 | 70 |
| 2017 | 10 |
| 2018 | 13 |
| 2019 | 14 |
| 2020 | 9 |
| 2021 | 24 |
| 2022 | 30 |
| 2023 | 18 |
| 2024 | 19 |
| 2025 | 15 |
| 2026 | 20 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1983-03-01 | Record snow depth | Record snow depth 81.3 cm (32.0 in) |
| 1983-03-02 | Record snow depth | Record snow depth 86.4 cm (34.0 in) |
Wettest Day of Each Month
Dec: 139.4 mm (5.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 91.2 mm (3.6 in) | 25 January 1953 |
| Feb | 77.5 mm (3.1 in) | 2 February 1948 |
| Mar | 81.8 mm (3.2 in) | 17 March 1954 |
| Apr | 120.9 mm (4.8 in) | 12 April 1965 |
| May | 123.2 mm (4.9 in) | 22 May 1954 |
| Jun | 64.0 mm (2.5 in) | 2 June 1957 |
| Jul | 60.2 mm (2.4 in) | 19 July 1982 |
| Aug | 62.5 mm (2.5 in) | 26 August 1956 |
| Sep | 117.3 mm (4.6 in) | 27 September 1950 |
| Oct | 85.3 mm (3.4 in) | 30 October 1955 |
| Nov | 74.7 mm (2.9 in) | 4 November 1966 |
| Dec | 139.4 mm (5.5 in) | 13 December 1955 |
Period of Record Coverage
1942 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1942 | 90 | 25% | No |
| 1943 | 364 | 100% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 361 | 99% | Yes |
| 1946 | 239 | 65% | No |
| 1947 | 360 | 99% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 364 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 363 | 99% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 358 | 98% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 357 | 98% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 360 | 98% | Yes |
| 1961 | 360 | 99% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 320 | 88% | No |
| 1972 | 365 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 364 | 100% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 305 | 84% | No |
| 1995 | 279 | 76% | No |
| 1996 | 189 | 52% | No |
| 1997 | 313 | 86% | No |
| 2017 | 107 | 29% | No |
| 2018 | 351 | 96% | Yes |
| 2019 | 336 | 92% | Yes |
| 2020 | 258 | 70% | No |
| 2021 | 300 | 82% | No |
| 2022 | 351 | 96% | Yes |
| 2023 | 355 | 97% | Yes |
| 2024 | 318 | 87% | No |
| 2025 | 292 | 80% | No |
| 2026 | 245 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 August 2026 | Adak AP, US | daily high max (Provisional) | 20.6 C (69.1 F) | 3.9 C (7.0 F) | 28 years | 32 of 100 (Routine) |
| 30 August 2026 | Adak AP, US | all-time high min (Tie, Provisional) | 14.4 C (57.9 F) | tie | 73 years | 12 of 100 (Routine) |
| 27 August 2026 | Adak AP, US | daily high max (Provisional) | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 4 years | 11 of 100 (Routine) |
| 26 July 2026 | Adak AP, US | daily high max | 21.1 C (70.0 F) | 1.1 C (2.0 F) | 45 years | 25 of 100 (Routine) |
| 25 July 2026 | Adak AP, US | daily high max | 21.7 C (71.1 F) | 0.6 C (1.1 F) | 64 years | 29 of 100 (Routine) |
| 24 July 2026 | Adak AP, US | daily high max | 21.1 C (70.0 F) | 2.8 C (5.0 F) | 60 years | 37 of 100 (Notable) |
| 23 July 2026 | Adak AP, US | daily high min (Tie) | 11.1 C (52.0 F) | tie | 48 years | 5 of 100 (Routine) |
| 8 July 2026 | Adak AP, US | daily low min (Tie) | 3.9 C (39.0 F) | tie | 76 years | 7 of 100 (Routine) |
| 3 July 2026 | Adak AP, US | daily low max (Tie) | 7.8 C (46.0 F) | tie | 48 years | 5 of 100 (Routine) |
| 6 June 2026 | Adak AP, US | daily low min | 0.6 C (33.1 F) | 0.5 C (0.9 F) | 76 years | 34 of 100 (Routine) |
| 14 May 2026 | Adak AP, US | daily low max | 3.9 C (39.0 F) | 0.5 C (0.9 F) | 80 years | 34 of 100 (Routine) |
| 17 April 2026 | Adak AP, US | daily high max | 9.4 C (48.9 F) | 1.1 C (2.0 F) | 0 years | 13 of 100 (Routine) |
| 14 April 2026 | Adak AP, US | daily high max | 8.3 C (46.9 F) | 0.5 C (0.9 F) | 76 years | 32 of 100 (Routine) |
| 13 April 2026 | Adak AP, US | daily high max (Tie) | 9.4 C (48.9 F) | tie | 44 years | 5 of 100 (Routine) |
| 9 April 2026 | Adak AP, US | daily high max (Tie) | 8.9 C (48.0 F) | tie | 53 years | 6 of 100 (Routine) |
| 7 April 2026 | Adak AP, US | daily high max | 10.0 C (50.0 F) | 1.1 C (2.0 F) | 72 years | 34 of 100 (Routine) |
| 6 April 2026 | Adak AP, US | daily high min (Tie) | 2.8 C (37.0 F) | tie | 80 years | 8 of 100 (Routine) |
| 5 April 2026 | Adak AP, US | daily high min | 3.3 C (37.9 F) | 0.5 C (0.9 F) | 60 years | 28 of 100 (Routine) |
| 29 March 2026 | Adak AP, US | daily high max | 10.0 C (50.0 F) | 1.7 C (3.1 F) | 73 years | 37 of 100 (Notable) |
| 28 March 2026 | Adak AP, US | daily high max | 11.7 C (53.1 F) | 2.8 C (5.0 F) | 56 years | 38 of 100 (Notable) |
Climate Trend
53 complete years, 1943 to 2023| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1943 | 4.3 C | -0.48 C |
| 1944 | 4.0 C | -0.73 C |
| 1945 | 4.8 C | +0.05 C |
| 1947 | 4.3 C | -0.47 C |
| 1948 | 4.7 C | -0.02 C |
| 1949 | 4.5 C | -0.29 C |
| 1950 | 4.9 C | +0.16 C |
| 1951 | 5.2 C | +0.42 C |
| 1952 | 4.4 C | -0.31 C |
| 1953 | 4.5 C | -0.26 C |
| 1954 | 4.4 C | -0.33 C |
| 1955 | 4.5 C | -0.20 C |
| 1956 | 5.2 C | +0.43 C |
| 1957 | 5.1 C | +0.36 C |
| 1958 | 4.5 C | -0.25 C |
| 1959 | 4.6 C | -0.10 C |
| 1960 | 4.4 C | -0.38 C |
| 1961 | 4.9 C | +0.13 C |
| 1962 | 5.5 C | +0.79 C |
| 1963 | 5.1 C | +0.31 C |
| 1964 | 4.3 C | -0.48 C |
| 1965 | 5.3 C | +0.53 C |
| 1966 | 4.9 C | +0.11 C |
| 1967 | 5.2 C | +0.43 C |
| 1968 | 4.8 C | +0.08 C |
| 1969 | 4.7 C | -0.07 C |
| 1970 | 5.1 C | +0.38 C |
| 1972 | 4.4 C | -0.37 C |
| 1973 | 4.2 C | -0.55 C |
| 1974 | 4.6 C | -0.12 C |
| 1975 | 3.9 C | -0.82 C |
| 1976 | 3.6 C | -1.10 C |
| 1977 | 4.5 C | -0.28 C |
| 1978 | 4.7 C | -0.08 C |
| 1979 | 5.1 C | +0.37 C |
| 1980 | 4.5 C | -0.22 C |
| 1981 | 5.3 C | +0.57 C |
| 1982 | 5.3 C | +0.55 C |
| 1983 | 4.8 C | +0.03 C |
| 1984 | 5.6 C | +0.89 C |
| 1985 | 5.3 C | +0.53 C |
| 1986 | 5.3 C | +0.52 C |
| 1987 | 4.5 C | -0.20 C |
| 1988 | 4.5 C | -0.27 C |
| 1989 | 5.0 C | +0.26 C |
| 1990 | 4.8 C | +0.03 C |
| 1991 | 4.5 C | -0.25 C |
| 1992 | 4.2 C | -0.58 C |
| 1993 | 4.1 C | -0.65 C |
| 1994 | 4.6 C | -0.18 C |
| 2018 | 5.5 C | +0.77 C |
| 2022 | 5.6 C | +0.82 C |
| 2023 | 5.5 C | +0.77 C |
The annual mean temperature here has risen by 0.08 C (0.01 to 0.14) per decade over 1943 to 2023. In Fahrenheit: 0.14 F (0.03 to 0.26) per decade. The slope is a straight line fitted to 53 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.08 C (0.01 to 0.14) per decade | 0.14 F (0.03 to 0.26) per decade | 1943 to 2023 | 53 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1943 to 2023 | 53 | Rise |
| Mean daily minimum | 0.01 C (-0.06 to 0.07) per decade | 0.02 F (-0.10 to 0.13) per decade | 1943 to 2023 | 53 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1942 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 23.9 C (75.0 F) | 1956 | 19.4 C (66.9 F) | 66 |
| Coldest night (TNn) | -16.1 C (3.0 F) | 1963 | -10.6 C (12.9 F) | 66 |
| Wettest day (Rx1day) | 139.4 mm (5.5 in) | 1955 | 50.8 mm (2.0 in) | 65 |
| Wettest five days (Rx5day) | 270.3 mm (10.6 in) | 1955 | 96.2 mm (3.8 in) | 65 |
| Longest dry spell (CDD) | 40 days | 1981 | 12 days | 65 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1942 | 10.0 C (50.0 F) |
| 1943 | 19.4 C (66.9 F) |
| 1944 | 16.1 C (61.0 F) |
| 1945 | 17.8 C (64.0 F) |
| 1946 | 14.4 C (57.9 F) |
| 1947 | 17.2 C (63.0 F) |
| 1948 | 20.0 C (68.0 F) |
| 1949 | 20.6 C (69.1 F) |
| 1950 | 21.1 C (70.0 F) |
| 1951 | 17.2 C (63.0 F) |
| 1952 | 18.3 C (64.9 F) |
| 1953 | 21.7 C (71.1 F) |
| 1954 | 18.9 C (66.0 F) |
| 1955 | 20.0 C (68.0 F) |
| 1956 | 23.9 C (75.0 F) |
| 1957 | 17.2 C (63.0 F) |
| 1958 | 19.4 C (66.9 F) |
| 1959 | 18.9 C (66.0 F) |
| 1960 | 17.2 C (63.0 F) |
| 1961 | 18.3 C (64.9 F) |
| 1962 | 22.2 C (72.0 F) |
| 1963 | 21.1 C (70.0 F) |
| 1964 | 18.3 C (64.9 F) |
| 1965 | 20.0 C (68.0 F) |
| 1966 | 18.3 C (64.9 F) |
| 1967 | 20.0 C (68.0 F) |
| 1968 | 18.3 C (64.9 F) |
| 1969 | 23.3 C (73.9 F) |
| 1970 | 20.6 C (69.1 F) |
| 1971 | 20.0 C (68.0 F) |
| 1972 | 16.7 C (62.1 F) |
| 1973 | 18.3 C (64.9 F) |
| 1974 | 18.9 C (66.0 F) |
| 1975 | 16.1 C (61.0 F) |
| 1976 | 14.4 C (57.9 F) |
| 1977 | 16.1 C (61.0 F) |
| 1978 | 16.1 C (61.0 F) |
| 1979 | 19.4 C (66.9 F) |
| 1980 | 20.0 C (68.0 F) |
| 1981 | 23.3 C (73.9 F) |
| 1982 | 18.9 C (66.0 F) |
| 1983 | 21.7 C (71.1 F) |
| 1984 | 21.7 C (71.1 F) |
| 1985 | 20.0 C (68.0 F) |
| 1986 | 21.7 C (71.1 F) |
| 1987 | 19.4 C (66.9 F) |
| 1988 | 18.9 C (66.0 F) |
| 1989 | 19.4 C (66.9 F) |
| 1990 | 20.0 C (68.0 F) |
| 1991 | 20.6 C (69.1 F) |
| 1992 | 16.1 C (61.0 F) |
| 1993 | 22.8 C (73.0 F) |
| 1994 | 21.1 C (70.0 F) |
| 1995 | 21.7 C (71.1 F) |
| 1996 | 19.4 C (66.9 F) |
| 1997 | 22.8 C (73.0 F) |
| 2017 | 16.7 C (62.1 F) |
| 2018 | 19.4 C (66.9 F) |
| 2019 | 17.8 C (64.0 F) |
| 2020 | 17.2 C (63.0 F) |
| 2021 | 16.1 C (61.0 F) |
| 2022 | 20.6 C (69.1 F) |
| 2023 | 22.2 C (72.0 F) |
| 2024 | 21.7 C (71.1 F) |
| 2025 | 21.1 C (70.0 F) |
| 2026 | 21.7 C (71.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1942 | -7.2 C (19.0 F) |
| 1943 | -9.4 C (15.1 F) |
| 1944 | -7.2 C (19.0 F) |
| 1945 | -7.8 C (18.0 F) |
| 1946 | -11.7 C (10.9 F) |
| 1947 | -11.1 C (12.0 F) |
| 1948 | -8.9 C (16.0 F) |
| 1949 | -9.4 C (15.1 F) |
| 1950 | -7.2 C (19.0 F) |
| 1951 | -10.6 C (12.9 F) |
| 1952 | -10.0 C (14.0 F) |
| 1953 | -10.6 C (12.9 F) |
| 1954 | -9.4 C (15.1 F) |
| 1955 | -8.3 C (17.1 F) |
| 1956 | -6.7 C (19.9 F) |
| 1957 | -11.7 C (10.9 F) |
| 1958 | -10.6 C (12.9 F) |
| 1959 | -10.6 C (12.9 F) |
| 1960 | -10.6 C (12.9 F) |
| 1961 | -7.8 C (18.0 F) |
| 1962 | -10.6 C (12.9 F) |
| 1963 | -16.1 C (3.0 F) |
| 1964 | -16.1 C (3.0 F) |
| 1965 | -14.4 C (6.1 F) |
| 1966 | -8.9 C (16.0 F) |
| 1967 | -14.4 C (6.1 F) |
| 1968 | -7.2 C (19.0 F) |
| 1969 | -11.1 C (12.0 F) |
| 1970 | -12.2 C (10.0 F) |
| 1971 | -14.4 C (6.1 F) |
| 1972 | -10.6 C (12.9 F) |
| 1973 | -12.2 C (10.0 F) |
| 1974 | -11.1 C (12.0 F) |
| 1975 | -14.4 C (6.1 F) |
| 1976 | -11.7 C (10.9 F) |
| 1977 | -8.3 C (17.1 F) |
| 1978 | -10.0 C (14.0 F) |
| 1979 | -13.3 C (8.1 F) |
| 1980 | -12.2 C (10.0 F) |
| 1981 | -11.7 C (10.9 F) |
| 1982 | -8.9 C (16.0 F) |
| 1983 | -13.3 C (8.1 F) |
| 1984 | -11.7 C (10.9 F) |
| 1985 | -11.1 C (12.0 F) |
| 1986 | -12.2 C (10.0 F) |
| 1987 | -10.6 C (12.9 F) |
| 1988 | -12.2 C (10.0 F) |
| 1989 | -16.1 C (3.0 F) |
| 1990 | -12.8 C (9.0 F) |
| 1991 | -12.8 C (9.0 F) |
| 1992 | -9.4 C (15.1 F) |
| 1993 | -12.8 C (9.0 F) |
| 1994 | -12.8 C (9.0 F) |
| 1995 | -9.4 C (15.1 F) |
| 1996 | -8.3 C (17.1 F) |
| 1997 | -12.8 C (9.0 F) |
| 2017 | -9.9 C (14.2 F) |
| 2018 | -9.3 C (15.3 F) |
| 2019 | -8.8 C (16.2 F) |
| 2020 | -9.3 C (15.3 F) |
| 2021 | -11.6 C (11.1 F) |
| 2022 | -10.5 C (13.1 F) |
| 2023 | -11.6 C (11.1 F) |
| 2024 | -12.1 C (10.2 F) |
| 2025 | -11.0 C (12.2 F) |
| 2026 | -8.9 C (16.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1942 | 20.1 mm (0.8 in) |
| 1943 | 43.9 mm (1.7 in) |
| 1944 | 48.8 mm (1.9 in) |
| 1945 | 37.3 mm (1.5 in) |
| 1946 | 37.6 mm (1.5 in) |
| 1947 | 50.0 mm (2.0 in) |
| 1948 | 77.5 mm (3.1 in) |
| 1949 | 81.0 mm (3.2 in) |
| 1950 | 117.3 mm (4.6 in) |
| 1951 | 76.2 mm (3.0 in) |
| 1952 | 67.3 mm (2.6 in) |
| 1953 | 91.2 mm (3.6 in) |
| 1954 | 123.2 mm (4.9 in) |
| 1955 | 139.4 mm (5.5 in) |
| 1956 | 71.6 mm (2.8 in) |
| 1957 | 81.0 mm (3.2 in) |
| 1958 | 62.2 mm (2.4 in) |
| 1959 | 57.2 mm (2.3 in) |
| 1960 | 48.8 mm (1.9 in) |
| 1961 | 37.8 mm (1.5 in) |
| 1962 | 72.4 mm (2.9 in) |
| 1963 | 101.6 mm (4.0 in) |
| 1964 | 57.9 mm (2.3 in) |
| 1965 | 120.9 mm (4.8 in) |
| 1966 | 74.7 mm (2.9 in) |
| 1967 | 55.9 mm (2.2 in) |
| 1968 | 62.0 mm (2.4 in) |
| 1969 | 48.5 mm (1.9 in) |
| 1970 | 35.8 mm (1.4 in) |
| 1971 | 70.1 mm (2.8 in) |
| 1972 | 52.1 mm (2.1 in) |
| 1973 | 50.8 mm (2.0 in) |
| 1974 | 48.8 mm (1.9 in) |
| 1975 | 39.9 mm (1.6 in) |
| 1976 | 39.4 mm (1.6 in) |
| 1977 | 46.0 mm (1.8 in) |
| 1978 | 53.3 mm (2.1 in) |
| 1979 | 33.0 mm (1.3 in) |
| 1980 | 30.7 mm (1.2 in) |
| 1981 | 38.9 mm (1.5 in) |
| 1982 | 60.2 mm (2.4 in) |
| 1983 | 38.4 mm (1.5 in) |
| 1984 | 31.8 mm (1.3 in) |
| 1985 | 53.8 mm (2.1 in) |
| 1986 | 70.9 mm (2.8 in) |
| 1987 | 31.8 mm (1.3 in) |
| 1988 | 36.6 mm (1.4 in) |
| 1989 | 46.5 mm (1.8 in) |
| 1990 | 40.9 mm (1.6 in) |
| 1991 | 77.5 mm (3.1 in) |
| 1992 | 24.4 mm (1.0 in) |
| 1993 | 77.5 mm (3.1 in) |
| 1994 | 46.2 mm (1.8 in) |
| 1995 | 54.9 mm (2.2 in) |
| 1996 | 25.7 mm (1.0 in) |
| 1997 | n/a |
| 2017 | 73.9 mm (2.9 in) |
| 2018 | 68.6 mm (2.7 in) |
| 2019 | 69.1 mm (2.7 in) |
| 2020 | 48.3 mm (1.9 in) |
| 2021 | 42.9 mm (1.7 in) |
| 2022 | 39.6 mm (1.6 in) |
| 2023 | 57.7 mm (2.3 in) |
| 2024 | 31.5 mm (1.2 in) |
| 2025 | 36.1 mm (1.4 in) |
| 2026 | 30.7 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1942 | 43.3 mm (1.7 in) |
| 1943 | 74.6 mm (2.9 in) |
| 1944 | 92.5 mm (3.6 in) |
| 1945 | 60.5 mm (2.4 in) |
| 1946 | 73.5 mm (2.9 in) |
| 1947 | 105.4 mm (4.1 in) |
| 1948 | 114.5 mm (4.5 in) |
| 1949 | 121.6 mm (4.8 in) |
| 1950 | 172.2 mm (6.8 in) |
| 1951 | 120.6 mm (4.7 in) |
| 1952 | 144.0 mm (5.7 in) |
| 1953 | 147.1 mm (5.8 in) |
| 1954 | 194.8 mm (7.7 in) |
| 1955 | 270.3 mm (10.6 in) |
| 1956 | 123.2 mm (4.9 in) |
| 1957 | 111.8 mm (4.4 in) |
| 1958 | 121.8 mm (4.8 in) |
| 1959 | 84.9 mm (3.3 in) |
| 1960 | 64.5 mm (2.5 in) |
| 1961 | 94.0 mm (3.7 in) |
| 1962 | 110.8 mm (4.4 in) |
| 1963 | 141.1 mm (5.6 in) |
| 1964 | 134.1 mm (5.3 in) |
| 1965 | 182.6 mm (7.2 in) |
| 1966 | 147.4 mm (5.8 in) |
| 1967 | 96.6 mm (3.8 in) |
| 1968 | 101.9 mm (4.0 in) |
| 1969 | 86.9 mm (3.4 in) |
| 1970 | 70.9 mm (2.8 in) |
| 1971 | 116.8 mm (4.6 in) |
| 1972 | 100.2 mm (3.9 in) |
| 1973 | 113.0 mm (4.4 in) |
| 1974 | 96.5 mm (3.8 in) |
| 1975 | 88.2 mm (3.5 in) |
| 1976 | 84.8 mm (3.3 in) |
| 1977 | 61.3 mm (2.4 in) |
| 1978 | 114.6 mm (4.5 in) |
| 1979 | 66.1 mm (2.6 in) |
| 1980 | 67.9 mm (2.7 in) |
| 1981 | 97.9 mm (3.9 in) |
| 1982 | 113.3 mm (4.5 in) |
| 1983 | 84.6 mm (3.3 in) |
| 1984 | 67.5 mm (2.7 in) |
| 1985 | 83.3 mm (3.3 in) |
| 1986 | 104.2 mm (4.1 in) |
| 1987 | 56.2 mm (2.2 in) |
| 1988 | 84.6 mm (3.3 in) |
| 1989 | 80.0 mm (3.1 in) |
| 1990 | 82.3 mm (3.2 in) |
| 1991 | 136.5 mm (5.4 in) |
| 1992 | 59.6 mm (2.3 in) |
| 1993 | 119.8 mm (4.7 in) |
| 1994 | 88.2 mm (3.5 in) |
| 1995 | 43.5 mm (1.7 in) |
| 1996 | 58.7 mm (2.3 in) |
| 1997 | n/a |
| 2017 | 125.2 mm (4.9 in) |
| 2018 | 90.2 mm (3.6 in) |
| 2019 | 140.4 mm (5.5 in) |
| 2020 | 70.2 mm (2.8 in) |
| 2021 | 76.7 mm (3.0 in) |
| 2022 | 70.0 mm (2.8 in) |
| 2023 | 96.2 mm (3.8 in) |
| 2024 | 62.3 mm (2.5 in) |
| 2025 | 100.1 mm (3.9 in) |
| 2026 | 36.3 mm (1.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1942 | 17 days |
| 1943 | 11 days |
| 1944 | 17 days |
| 1945 | 17 days |
| 1946 | 11 days |
| 1947 | 15 days |
| 1948 | 11 days |
| 1949 | 10 days |
| 1950 | 19 days |
| 1951 | 8 days |
| 1952 | 14 days |
| 1953 | 17 days |
| 1954 | 15 days |
| 1955 | 9 days |
| 1956 | 12 days |
| 1957 | 10 days |
| 1958 | 13 days |
| 1959 | 21 days |
| 1960 | 11 days |
| 1961 | 11 days |
| 1962 | 18 days |
| 1963 | 11 days |
| 1964 | 17 days |
| 1965 | 13 days |
| 1966 | 16 days |
| 1967 | 18 days |
| 1968 | 17 days |
| 1969 | 13 days |
| 1970 | 12 days |
| 1971 | 11 days |
| 1972 | 15 days |
| 1973 | 13 days |
| 1974 | 7 days |
| 1975 | 10 days |
| 1976 | 8 days |
| 1977 | 8 days |
| 1978 | 11 days |
| 1979 | 7 days |
| 1980 | 10 days |
| 1981 | 40 days |
| 1982 | 13 days |
| 1983 | 8 days |
| 1984 | 11 days |
| 1985 | 8 days |
| 1986 | 11 days |
| 1987 | 8 days |
| 1988 | 14 days |
| 1989 | 13 days |
| 1990 | 13 days |
| 1991 | 8 days |
| 1992 | 19 days |
| 1993 | 9 days |
| 1994 | 10 days |
| 1995 | 14 days |
| 1996 | 8 days |
| 1997 | n/a |
| 2017 | 4 days |
| 2018 | 13 days |
| 2019 | 12 days |
| 2020 | 13 days |
| 2021 | 8 days |
| 2022 | 18 days |
| 2023 | 13 days |
| 2024 | 10 days |
| 2025 | 12 days |
| 2026 | 26 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
53 years with a frostAcross 53 years with a frost, the median last spring frost at Adak AP falls on 15 May and the median first autumn frost on 18 October, which leaves a median of 153 days between them.
Fitted over all years, the growing season changes by -5.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1967 to 2023) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 15 May | n/a | 18 May | n/a | +2.2 days per decade |
| First autumn frost | 18 October | n/a | 15 October | n/a | -2.9 days per decade |
| Growing days | 153 days | n/a | 150 days | n/a | -5.1 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
55 years, 1943 to 2023A day with at least 54.8 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 151.1 mm (5.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 54.8 mm (2.2 in) | |
| 5 years | 76.5 mm (3.0 in) | |
| 10 years | 92.4 mm (3.6 in) | |
| 25 years | 114.4 mm (4.5 in) | |
| 50 years | 132.2 mm (5.2 in) | |
| 100 years | 151.1 mm (5.9 in) | Longer than the 55 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 55 years of values from 1943 to 2023.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 139.4 mm (5.5 in) in 1955; 123.2 mm (4.9 in) in 1954; 120.9 mm (4.8 in) in 1965.
Download the Data
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).