Barter Island WSO AP Weather Records (USW00027401)
Record envelope, standing records and threshold days for Barter Island WSO AP (USW00027401), Alaska, United States, with 80 years of record.
Key Facts for Barter Island WSO AP
- Barter Island WSO AP (USW00027401) is a weather station in Alaska, United States at 70.13 latitude and -143.63 longitude, 12 m (39 ft) above sea level.
- The station reports from 1947 to 2026, 80 years of record.
- 1,464 records set at Barter Island WSO AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Barter Island WSO AP set a daily record high maximum temperature of 11.7 C (53.1 F) on 12 September 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, 70.13 latitude, -143.63 longitude.
- Elevation: 12 m (39 ft).
- Period of record: 1947 to 2026, 80 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
7 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 3.9 C (39.0 F) | -47.8 C (-54.0 F) | -0.6 C (30.9 F) | -40.6 C (-41.1 F) |
| Feb | 2.8 C (37.0 F) | -50.6 C (-59.1 F) | -12.8 C (9.0 F) | -40.0 C (-40.0 F) |
| Mar | 2.2 C (36.0 F) | -46.1 C (-51.0 F) | -6.7 C (19.9 F) | -30.6 C (-23.1 F) |
| Apr | 6.1 C (43.0 F) | -42.2 C (-44.0 F) | 1.1 C (34.0 F) | -28.9 C (-20.0 F) |
| May | 11.1 C (52.0 F) | -26.7 C (-16.1 F) | 7.8 C (46.0 F) | -12.2 C (10.0 F) |
| Jun | 20.0 C (68.0 F) | -12.8 C (9.0 F) | 11.0 C (51.8 F) | -4.4 C (24.1 F) |
| Jul | 25.6 C (78.1 F) | -4.4 C (24.1 F) | 5.6 C (42.1 F) | -2.2 C (28.0 F) |
| Aug | 22.2 C (72.0 F) | -6.7 C (19.9 F) | 18.9 C (66.0 F) | 0.0 C (32.0 F) |
| Sep | 18.9 C (66.0 F) | -15.6 C (3.9 F) | 13.9 C (57.0 F) | -5.0 C (23.0 F) |
| Oct | 9.4 C (48.9 F) | -32.2 C (-26.0 F) | 2.2 C (36.0 F) | -17.2 C (1.0 F) |
| Nov | 5.0 C (41.0 F) | -46.1 C (-51.0 F) | n/a | n/a |
| Dec | 2.8 C (37.0 F) | -46.1 C (-51.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1947 | 2 |
| 1948 | 36 |
| 1949 | 35 |
| 1950 | 32 |
| 1951 | 21 |
| 1952 | 20 |
| 1953 | 21 |
| 1954 | 33 |
| 1955 | 14 |
| 1956 | 23 |
| 1957 | 53 |
| 1958 | 20 |
| 1959 | 41 |
| 1960 | 29 |
| 1961 | 33 |
| 1962 | 33 |
| 1963 | 32 |
| 1964 | 32 |
| 1965 | 59 |
| 1966 | 21 |
| 1967 | 44 |
| 1968 | 22 |
| 1969 | 33 |
| 1970 | 40 |
| 1971 | 35 |
| 1972 | 23 |
| 1973 | 23 |
| 1974 | 40 |
| 1975 | 45 |
| 1976 | 30 |
| 1977 | 18 |
| 1978 | 28 |
| 1979 | 24 |
| 1980 | 25 |
| 1981 | 5 |
| 1982 | 23 |
| 1983 | 26 |
| 1984 | 36 |
| 1985 | 27 |
| 1986 | 22 |
| 1987 | 25 |
| 1988 | 46 |
| 2009 | 2 |
| 2010 | 5 |
| 2011 | 7 |
| 2012 | 35 |
| 2013 | 11 |
| 2014 | 12 |
| 2015 | 7 |
| 2016 | 30 |
| 2017 | 33 |
| 2018 | 3 |
| 2019 | 32 |
| 2020 | 9 |
| 2021 | 5 |
| 2022 | 9 |
| 2024 | 2 |
| 2025 | 25 |
| 2026 | 7 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 1997-04-11 | Record snow depth | Record snow depth 127.0 cm (50.0 in) |
| 2010-08-03 | Record high minimum temperature | Record high minimum temperature 10.0 C (50.0 F) |
| 2012-07-26 | Record high minimum temperature | Record high minimum temperature 10.6 C (51.1 F) |
| 2016-07-15 | Record high minimum temperature | Record high minimum temperature 11.7 C (53.1 F) |
Wettest Day of Each Month
Jul: 41.7 mm (1.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 33.8 mm (1.3 in) | 17 January 1954 |
| Feb | 18.0 mm (0.7 in) | 23 February 2018 |
| Mar | 13.7 mm (0.5 in) | 14 March 1967 |
| Apr | 11.2 mm (0.4 in) | 4 April 1963 |
| May | 18.5 mm (0.7 in) | 10 May 1954 |
| Jun | 30.5 mm (1.2 in) | 21 June 1952 |
| Jul | 41.7 mm (1.6 in) | 28 July 1971 |
| Aug | 22.9 mm (0.9 in) | 7 August 1948 |
| Sep | 23.9 mm (0.9 in) | 19 September 1954 |
| Oct | 15.2 mm (0.6 in) | 6 October 1954 |
| Nov | 10.9 mm (0.4 in) | 25 November 1954 |
| Dec | 13.2 mm (0.5 in) | 25 December 1949 |
Period of Record Coverage
1947 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1947 | 84 | 23% | No |
| 1948 | 364 | 99% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 360 | 99% | Yes |
| 1951 | 364 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 363 | 99% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 222 | 61% | No |
| 1956 | 338 | 92% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 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 | 359 | 98% | Yes |
| 1972 | 366 | 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 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 2 | 1% | No |
| 2009 | 28 | 8% | No |
| 2010 | 116 | 32% | No |
| 2011 | 96 | 26% | No |
| 2012 | 142 | 39% | No |
| 2013 | 66 | 18% | No |
| 2014 | 102 | 28% | No |
| 2015 | 132 | 36% | No |
| 2016 | 250 | 68% | No |
| 2017 | 263 | 72% | No |
| 2018 | 16 | 4% | No |
| 2019 | 172 | 47% | No |
| 2020 | 63 | 17% | No |
| 2021 | 139 | 38% | No |
| 2022 | 96 | 26% | No |
| 2023 | 13 | 4% | No |
| 2024 | 11 | 3% | No |
| 2025 | 280 | 77% | No |
| 2026 | 181 | 50% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 12 September 2026 | Barter Island WSO AP, US | daily high max (Provisional) | 11.7 C (53.1 F) | 0.6 C (1.1 F) | 16 years | 13 of 100 (Routine) |
| 11 September 2026 | Barter Island WSO AP, US | daily rain (Provisional) | 7.1 mm (0.28 in) | 5.8 mm (0.23 in) | 65 years | 20 of 100 (Routine) |
| 11 September 2026 | Barter Island WSO AP, US | monthly high min (Tie, Provisional) | 6.1 C (43.0 F) | tie | 14 years | 5 of 100 (Routine) |
| 24 August 2026 | Barter Island WSO AP, US | daily high max (Provisional) | 18.9 C (66.0 F) | 2.8 C (5.0 F) | 72 years | 35 of 100 (Notable) |
| 29 June 2026 | Barter Island WSO AP, US | daily rain | 18.5 mm (0.7 in) | 9.6 mm (0.38 in) | 57 years | 20 of 100 (Routine) |
| 3 June 2026 | Barter Island WSO AP, US | daily high max | 11.0 C (51.8 F) | 1.0 C (1.8 F) | 43 years | 22 of 100 (Routine) |
| 5 May 2026 | Barter Island WSO AP, US | daily high min (Tie) | -5.0 C (23.0 F) | tie | 49 years | 5 of 100 (Routine) |
| 4 May 2026 | Barter Island WSO AP, US | daily high min (Tie) | -3.9 C (25.0 F) | tie | 49 years | 5 of 100 (Routine) |
| 3 May 2026 | Barter Island WSO AP, US | daily high max | 3.0 C (37.4 F) | 0.2 C (0.4 F) | 59 years | 25 of 100 (Routine) |
| 11 April 2026 | Barter Island WSO AP, US | daily high max | -1.1 C (30.0 F) | 1.7 C (3.1 F) | 68 years | 30 of 100 (Routine) |
| 28 March 2026 | Barter Island WSO AP, US | daily high min | -11.1 C (12.0 F) | 0.6 C (1.1 F) | 7 years | 10 of 100 (Routine) |
| 24 January 2026 | Barter Island WSO AP, US | daily high max | -1.1 C (30.0 F) | 3.3 C (5.9 F) | 76 years | 33 of 100 (Routine) |
| 23 January 2026 | Barter Island WSO AP, US | daily high min | -11.1 C (12.0 F) | 3.3 C (5.9 F) | 64 years | 31 of 100 (Routine) |
| 23 January 2026 | Barter Island WSO AP, US | daily high max | -0.6 C (30.9 F) | 3.3 C (5.9 F) | 59 years | 28 of 100 (Routine) |
| 26 October 2025 | Barter Island WSO AP, US | daily high min (Tie) | -5.6 C (21.9 F) | tie | 38 years | 4 of 100 (Routine) |
| 15 October 2025 | Barter Island WSO AP, US | daily high max | 0.0 C (32.0 F) | 0.6 C (1.1 F) | 67 years | 28 of 100 (Routine) |
| 14 October 2025 | Barter Island WSO AP, US | daily high max (Tie) | 0.6 C (33.1 F) | tie | 38 years | 4 of 100 (Routine) |
| 13 October 2025 | Barter Island WSO AP, US | daily high max | 5.0 C (41.0 F) | 1.1 C (2.0 F) | 16 years | 12 of 100 (Routine) |
| 13 October 2025 | Barter Island WSO AP, US | daily high min | -0.6 C (30.9 F) | 0.5 C (0.9 F) | 16 years | 11 of 100 (Routine) |
| 9 October 2025 | Barter Island WSO AP, US | daily high min | 1.1 C (34.0 F) | 1.1 C (2.0 F) | 8 years | 10 of 100 (Routine) |
Climate Trend
39 complete years, 1948 to 1988| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1948 | -12.7 C | -0.34 C |
| 1949 | -11.8 C | +0.49 C |
| 1950 | -11.0 C | +1.28 C |
| 1951 | -11.8 C | +0.48 C |
| 1952 | -12.5 C | -0.18 C |
| 1953 | -12.3 C | +0.04 C |
| 1954 | -11.7 C | +0.67 C |
| 1957 | -12.0 C | +0.34 C |
| 1958 | -11.2 C | +1.14 C |
| 1959 | -13.6 C | -1.30 C |
| 1960 | -12.3 C | +0.02 C |
| 1961 | -13.6 C | -1.30 C |
| 1962 | -10.2 C | +2.17 C |
| 1963 | -11.1 C | +1.27 C |
| 1964 | -14.2 C | -1.88 C |
| 1965 | -13.1 C | -0.78 C |
| 1966 | -12.7 C | -0.34 C |
| 1967 | -11.9 C | +0.42 C |
| 1968 | -12.0 C | +0.33 C |
| 1969 | -12.2 C | +0.17 C |
| 1970 | -13.4 C | -1.07 C |
| 1971 | -13.7 C | -1.41 C |
| 1972 | -12.2 C | +0.12 C |
| 1973 | -11.8 C | +0.50 C |
| 1974 | -15.4 C | -3.12 C |
| 1975 | -14.2 C | -1.87 C |
| 1976 | -13.1 C | -0.77 C |
| 1977 | -12.0 C | +0.34 C |
| 1978 | -11.0 C | +1.31 C |
| 1979 | -10.4 C | +1.88 C |
| 1980 | -12.1 C | +0.19 C |
| 1981 | -10.2 C | +2.08 C |
| 1982 | -12.2 C | +0.15 C |
| 1983 | -12.8 C | -0.47 C |
| 1984 | -14.3 C | -2.02 C |
| 1985 | -11.6 C | +0.76 C |
| 1986 | -12.2 C | +0.12 C |
| 1987 | -11.8 C | +0.51 C |
| 1988 | -12.1 C | +0.26 C |
The fitted trend in annual mean temperature here over 1948 to 1988 is 0.0 C (-0.4 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.7 to 0.5) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.0 C (-0.4 to 0.3) per decade | -0.1 F (-0.7 to 0.5) per decade | 1948 to 1988 | 39 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.4 to 0.2) per decade | -0.2 F (-0.8 to 0.4) per decade | 1948 to 1988 | 39 | Not clearly different from zero |
| Mean daily minimum | -0.01 C (-0.33 to 0.31) per decade | -0.03 F (-0.60 to 0.55) per decade | 1948 to 1988 | 39 | 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
1947 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 25.6 C (78.1 F) | 1974 | 18.3 C (64.9 F) | 61 |
| Coldest night (TNn) | -50.6 C (-59.1 F) | 1950 | -43.3 C (-45.9 F) | 61 |
| Wettest day (Rx1day) | 41.7 mm (1.6 in) | 1971 | 9.9 mm (0.39 in) | 61 |
| Wettest five days (Rx5day) | 64.2 mm (2.5 in) | 1950 | 18.5 mm (0.7 in) | 59 |
| Longest dry spell (CDD) | 124 days | 1988 | 44 days | 61 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1947 | 5.0 C (41.0 F) |
| 1948 | 16.1 C (61.0 F) |
| 1949 | 17.2 C (63.0 F) |
| 1950 | 17.8 C (64.0 F) |
| 1951 | 16.7 C (62.1 F) |
| 1952 | 18.3 C (64.9 F) |
| 1953 | 21.7 C (71.1 F) |
| 1954 | 16.1 C (61.0 F) |
| 1955 | 16.1 C (61.0 F) |
| 1956 | 20.0 C (68.0 F) |
| 1957 | 22.2 C (72.0 F) |
| 1958 | 18.3 C (64.9 F) |
| 1959 | 17.2 C (63.0 F) |
| 1960 | 20.0 C (68.0 F) |
| 1961 | 18.9 C (66.0 F) |
| 1962 | 18.9 C (66.0 F) |
| 1963 | 18.9 C (66.0 F) |
| 1964 | 17.8 C (64.0 F) |
| 1965 | 15.0 C (59.0 F) |
| 1966 | 16.7 C (62.1 F) |
| 1967 | 23.9 C (75.0 F) |
| 1968 | 17.8 C (64.0 F) |
| 1969 | 23.3 C (73.9 F) |
| 1970 | 16.7 C (62.1 F) |
| 1971 | 18.3 C (64.9 F) |
| 1972 | 15.0 C (59.0 F) |
| 1973 | 19.4 C (66.9 F) |
| 1974 | 25.6 C (78.1 F) |
| 1975 | 20.0 C (68.0 F) |
| 1976 | 21.7 C (71.1 F) |
| 1977 | 15.6 C (60.1 F) |
| 1978 | 18.9 C (66.0 F) |
| 1979 | 20.0 C (68.0 F) |
| 1980 | 15.0 C (59.0 F) |
| 1981 | 15.0 C (59.0 F) |
| 1982 | 18.3 C (64.9 F) |
| 1983 | 14.4 C (57.9 F) |
| 1984 | 17.2 C (63.0 F) |
| 1985 | 21.7 C (71.1 F) |
| 1986 | 18.9 C (66.0 F) |
| 1987 | 20.0 C (68.0 F) |
| 1988 | 18.9 C (66.0 F) |
| 1989 | -9.4 C (15.1 F) |
| 1990 | n/a |
| 1997 | n/a |
| 1998 | n/a |
| 1999 | n/a |
| 2009 | 3.9 C (39.0 F) |
| 2010 | 18.9 C (66.0 F) |
| 2011 | 14.4 C (57.9 F) |
| 2012 | 18.3 C (64.9 F) |
| 2013 | 15.0 C (59.0 F) |
| 2014 | 15.0 C (59.0 F) |
| 2015 | 12.8 C (55.0 F) |
| 2016 | 24.4 C (75.9 F) |
| 2017 | 20.0 C (68.0 F) |
| 2018 | 23.3 C (73.9 F) |
| 2019 | 21.7 C (71.1 F) |
| 2020 | 15.0 C (59.0 F) |
| 2021 | 19.4 C (66.9 F) |
| 2022 | 15.6 C (60.1 F) |
| 2023 | 16.1 C (61.0 F) |
| 2024 | 21.7 C (71.1 F) |
| 2025 | 22.2 C (72.0 F) |
| 2026 | 18.9 C (66.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1947 | -34.4 C (-29.9 F) |
| 1948 | -46.1 C (-51.0 F) |
| 1949 | -45.6 C (-50.1 F) |
| 1950 | -50.6 C (-59.1 F) |
| 1951 | -43.9 C (-47.0 F) |
| 1952 | -42.2 C (-44.0 F) |
| 1953 | -43.9 C (-47.0 F) |
| 1954 | -42.8 C (-45.0 F) |
| 1955 | -44.4 C (-47.9 F) |
| 1956 | -45.6 C (-50.1 F) |
| 1957 | -45.6 C (-50.1 F) |
| 1958 | -45.0 C (-49.0 F) |
| 1959 | -42.2 C (-44.0 F) |
| 1960 | -42.8 C (-45.0 F) |
| 1961 | -46.1 C (-51.0 F) |
| 1962 | -46.1 C (-51.0 F) |
| 1963 | -42.2 C (-44.0 F) |
| 1964 | -44.4 C (-47.9 F) |
| 1965 | -46.1 C (-51.0 F) |
| 1966 | -43.9 C (-47.0 F) |
| 1967 | -41.7 C (-43.1 F) |
| 1968 | -46.1 C (-51.0 F) |
| 1969 | -45.0 C (-49.0 F) |
| 1970 | -45.6 C (-50.1 F) |
| 1971 | -44.4 C (-47.9 F) |
| 1972 | -43.9 C (-47.0 F) |
| 1973 | -46.1 C (-51.0 F) |
| 1974 | -45.6 C (-50.1 F) |
| 1975 | -47.8 C (-54.0 F) |
| 1976 | -45.0 C (-49.0 F) |
| 1977 | -44.4 C (-47.9 F) |
| 1978 | -42.2 C (-44.0 F) |
| 1979 | -43.9 C (-47.0 F) |
| 1980 | -45.0 C (-49.0 F) |
| 1981 | -41.7 C (-43.1 F) |
| 1982 | -41.1 C (-42.0 F) |
| 1983 | -46.1 C (-51.0 F) |
| 1984 | -46.7 C (-52.1 F) |
| 1985 | -47.2 C (-53.0 F) |
| 1986 | -42.8 C (-45.0 F) |
| 1987 | -50.0 C (-58.0 F) |
| 1988 | -40.6 C (-41.1 F) |
| 1989 | -24.4 C (-11.9 F) |
| 1990 | n/a |
| 1997 | n/a |
| 1998 | n/a |
| 1999 | n/a |
| 2009 | -28.9 C (-20.0 F) |
| 2010 | -37.8 C (-36.0 F) |
| 2011 | -39.4 C (-38.9 F) |
| 2012 | -40.0 C (-40.0 F) |
| 2013 | -36.7 C (-34.1 F) |
| 2014 | -36.7 C (-34.1 F) |
| 2015 | -36.1 C (-33.0 F) |
| 2016 | -36.1 C (-33.0 F) |
| 2017 | -38.3 C (-36.9 F) |
| 2018 | -33.9 C (-29.0 F) |
| 2019 | -38.3 C (-36.9 F) |
| 2020 | -43.3 C (-45.9 F) |
| 2021 | -41.1 C (-42.0 F) |
| 2022 | -41.7 C (-43.1 F) |
| 2023 | -41.1 C (-42.0 F) |
| 2024 | -37.8 C (-36.0 F) |
| 2025 | -37.2 C (-35.0 F) |
| 2026 | -40.6 C (-41.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1947 | n/a |
| 1948 | 22.9 mm (0.9 in) |
| 1949 | 13.2 mm (0.5 in) |
| 1950 | 34.5 mm (1.4 in) |
| 1951 | 10.2 mm (0.4 in) |
| 1952 | 30.5 mm (1.2 in) |
| 1953 | 8.4 mm (0.33 in) |
| 1954 | 33.8 mm (1.3 in) |
| 1955 | 18.3 mm (0.7 in) |
| 1956 | 29.2 mm (1.1 in) |
| 1957 | 23.1 mm (0.9 in) |
| 1958 | 6.9 mm (0.27 in) |
| 1959 | 14.2 mm (0.6 in) |
| 1960 | 7.4 mm (0.29 in) |
| 1961 | 19.3 mm (0.8 in) |
| 1962 | 17.5 mm (0.7 in) |
| 1963 | 21.3 mm (0.8 in) |
| 1964 | 16.0 mm (0.6 in) |
| 1965 | 14.0 mm (0.6 in) |
| 1966 | 19.1 mm (0.8 in) |
| 1967 | 16.0 mm (0.6 in) |
| 1968 | 13.2 mm (0.5 in) |
| 1969 | 9.9 mm (0.39 in) |
| 1970 | 9.7 mm (0.38 in) |
| 1971 | 41.7 mm (1.6 in) |
| 1972 | 9.1 mm (0.36 in) |
| 1973 | 8.1 mm (0.32 in) |
| 1974 | 10.7 mm (0.4 in) |
| 1975 | 8.9 mm (0.35 in) |
| 1976 | 10.7 mm (0.4 in) |
| 1977 | 5.8 mm (0.23 in) |
| 1978 | 7.9 mm (0.31 in) |
| 1979 | 16.3 mm (0.6 in) |
| 1980 | 8.9 mm (0.35 in) |
| 1981 | 12.2 mm (0.5 in) |
| 1982 | 19.6 mm (0.8 in) |
| 1983 | 8.9 mm (0.35 in) |
| 1984 | 22.4 mm (0.9 in) |
| 1985 | 8.9 mm (0.35 in) |
| 1986 | 8.9 mm (0.35 in) |
| 1987 | 8.9 mm (0.35 in) |
| 1988 | 9.4 mm (0.37 in) |
| 1989 | 3.0 mm (0.12 in) |
| 1990 | n/a |
| 1997 | n/a |
| 1998 | 0.0 mm (0.00 in) |
| 1999 | n/a |
| 2009 | 4.6 mm (0.18 in) |
| 2010 | 17.5 mm (0.7 in) |
| 2011 | 0.0 mm (0.00 in) |
| 2012 | 7.6 mm (0.30 in) |
| 2013 | 0.0 mm (0.00 in) |
| 2014 | 1.5 mm (0.06 in) |
| 2015 | 8.6 mm (0.34 in) |
| 2016 | 6.9 mm (0.27 in) |
| 2017 | 5.6 mm (0.22 in) |
| 2018 | 18.0 mm (0.7 in) |
| 2019 | 4.1 mm (0.16 in) |
| 2020 | 0.5 mm (0.02 in) |
| 2021 | 1.8 mm (0.07 in) |
| 2022 | 10.2 mm (0.4 in) |
| 2023 | 4.6 mm (0.18 in) |
| 2024 | 12.2 mm (0.5 in) |
| 2025 | 8.1 mm (0.32 in) |
| 2026 | 18.5 mm (0.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1947 | n/a |
| 1948 | 25.9 mm (1.0 in) |
| 1949 | 26.2 mm (1.0 in) |
| 1950 | 64.2 mm (2.5 in) |
| 1951 | 23.6 mm (0.9 in) |
| 1952 | 32.0 mm (1.3 in) |
| 1953 | 20.3 mm (0.8 in) |
| 1954 | 61.5 mm (2.4 in) |
| 1955 | 52.1 mm (2.1 in) |
| 1956 | 34.3 mm (1.4 in) |
| 1957 | 45.5 mm (1.8 in) |
| 1958 | 9.7 mm (0.38 in) |
| 1959 | 27.2 mm (1.1 in) |
| 1960 | 10.3 mm (0.4 in) |
| 1961 | 38.4 mm (1.5 in) |
| 1962 | 37.6 mm (1.5 in) |
| 1963 | 35.9 mm (1.4 in) |
| 1964 | 31.5 mm (1.2 in) |
| 1965 | 22.1 mm (0.9 in) |
| 1966 | 34.6 mm (1.4 in) |
| 1967 | 32.2 mm (1.3 in) |
| 1968 | 21.8 mm (0.9 in) |
| 1969 | 17.0 mm (0.7 in) |
| 1970 | 17.8 mm (0.7 in) |
| 1971 | 52.1 mm (2.1 in) |
| 1972 | 15.2 mm (0.6 in) |
| 1973 | 13.9 mm (0.5 in) |
| 1974 | 13.8 mm (0.5 in) |
| 1975 | 10.7 mm (0.4 in) |
| 1976 | 25.1 mm (1.0 in) |
| 1977 | 13.6 mm (0.5 in) |
| 1978 | 9.9 mm (0.39 in) |
| 1979 | 19.4 mm (0.8 in) |
| 1980 | 12.2 mm (0.5 in) |
| 1981 | 14.0 mm (0.6 in) |
| 1982 | 35.0 mm (1.4 in) |
| 1983 | 14.3 mm (0.6 in) |
| 1984 | 26.2 mm (1.0 in) |
| 1985 | 19.6 mm (0.8 in) |
| 1986 | 15.3 mm (0.6 in) |
| 1987 | 20.8 mm (0.8 in) |
| 1988 | 18.9 mm (0.7 in) |
| 1989 | 3.3 mm (0.13 in) |
| 1990 | n/a |
| 1997 | n/a |
| 1998 | 0.0 mm (0.00 in) |
| 1999 | n/a |
| 2009 | 0.0 mm (0.00 in) |
| 2010 | 0.0 mm (0.00 in) |
| 2011 | n/a |
| 2012 | 7.9 mm (0.31 in) |
| 2013 | n/a |
| 2014 | 0.0 mm (0.00 in) |
| 2015 | 0.0 mm (0.00 in) |
| 2016 | 9.4 mm (0.37 in) |
| 2017 | 7.7 mm (0.30 in) |
| 2018 | 18.0 mm (0.7 in) |
| 2019 | 7.4 mm (0.29 in) |
| 2020 | 0.6 mm (0.02 in) |
| 2021 | 0.0 mm (0.00 in) |
| 2022 | 0.3 mm (0.01 in) |
| 2023 | 10.0 mm (0.4 in) |
| 2024 | 28.5 mm (1.1 in) |
| 2025 | 18.8 mm (0.7 in) |
| 2026 | 18.5 mm (0.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1947 | n/a |
| 1948 | 37 days |
| 1949 | 56 days |
| 1950 | 63 days |
| 1951 | 41 days |
| 1952 | 54 days |
| 1953 | 42 days |
| 1954 | 42 days |
| 1955 | 32 days |
| 1956 | 52 days |
| 1957 | 63 days |
| 1958 | 47 days |
| 1959 | 75 days |
| 1960 | 65 days |
| 1961 | 42 days |
| 1962 | 44 days |
| 1963 | 63 days |
| 1964 | 70 days |
| 1965 | 52 days |
| 1966 | 46 days |
| 1967 | 28 days |
| 1968 | 71 days |
| 1969 | 78 days |
| 1970 | 42 days |
| 1971 | 68 days |
| 1972 | 42 days |
| 1973 | 72 days |
| 1974 | 105 days |
| 1975 | 65 days |
| 1976 | 29 days |
| 1977 | 55 days |
| 1978 | 64 days |
| 1979 | 84 days |
| 1980 | 56 days |
| 1981 | 97 days |
| 1982 | 72 days |
| 1983 | 57 days |
| 1984 | 70 days |
| 1985 | 58 days |
| 1986 | 85 days |
| 1987 | 73 days |
| 1988 | 124 days |
| 1989 | 9 days |
| 1990 | n/a |
| 1997 | n/a |
| 1998 | 12 days |
| 1999 | n/a |
| 2009 | 5 days |
| 2010 | 7 days |
| 2011 | 2 days |
| 2012 | 10 days |
| 2013 | 2 days |
| 2014 | 5 days |
| 2015 | 8 days |
| 2016 | 7 days |
| 2017 | 14 days |
| 2018 | 6 days |
| 2019 | 5 days |
| 2020 | 7 days |
| 2021 | 7 days |
| 2022 | 6 days |
| 2023 | 7 days |
| 2024 | 7 days |
| 2025 | 36 days |
| 2026 | 28 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
39 years with a frostAcross 39 years with a frost, the median last spring frost at Barter Island WSO AP falls on 30 June and the median first autumn frost on 2 July, which leaves a median of 3 days between them.
Fitted over all years, the growing season changes by +2.5 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1959 to 1988) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 30 June | n/a | 30 June | n/a | -0.8 days per decade |
| First autumn frost | 2 July | n/a | 2 July | n/a | +1.7 days per decade |
| Growing days | 3 days | n/a | 3 days | n/a | +2.5 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
40 years, 1949 to 1988A day with at least 12.8 mm (0.5 in) of rain is expected about once in 2 years. A day with at least 53.3 mm (2.1 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 12.8 mm (0.5 in) | |
| 5 years | 19.8 mm (0.8 in) | |
| 10 years | 25.6 mm (1.0 in) | |
| 25 years | 34.9 mm (1.4 in) | |
| 50 years | 43.3 mm (1.7 in) | Longer than the 40 years of record |
| 100 years | 53.3 mm (2.1 in) | Longer than the 40 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, 40 years of values from 1949 to 1988.
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: 41.7 mm (1.6 in) in 1971; 34.5 mm (1.4 in) in 1950; 33.8 mm (1.3 in) in 1954.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).