Island Park Weather Records (USC00104598)
Record envelope, standing records and threshold days for Island Park (USC00104598), Idaho, United States, with 90 years of record.
Key Facts for Island Park
- Island Park (USC00104598) is a weather station in Idaho, United States at 44.42 latitude and -111.37 longitude, 1,917 m (6,290 ft) above sea level.
- The station reports from 1937 to 2026, 90 years of record.
- 1,464 records set at Island Park still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Island Park tied a daily record high minimum temperature of 11.1 C (52.0 F) on 27 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Idaho, United States, 44.42 latitude, -111.37 longitude.
- Elevation: 1,917 m (6,290 ft).
- Period of record: 1937 to 2026, 90 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
15 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 9.4 C (48.9 F) | -51.1 C (-60.0 F) | 5.6 C (42.1 F) | -25.6 C (-14.1 F) |
| Feb | 12.8 C (55.0 F) | -47.8 C (-54.0 F) | 12.8 C (55.0 F) | -28.3 C (-18.9 F) |
| Mar | 20.0 C (68.0 F) | -37.8 C (-36.0 F) | 20.0 C (68.0 F) | -16.7 C (1.9 F) |
| Apr | 24.4 C (75.9 F) | -27.8 C (-18.0 F) | 21.1 C (70.0 F) | -13.9 C (7.0 F) |
| May | 28.9 C (84.0 F) | -13.9 C (7.0 F) | 26.7 C (80.1 F) | -7.8 C (18.0 F) |
| Jun | 32.8 C (91.0 F) | -6.7 C (19.9 F) | 26.1 C (79.0 F) | -2.2 C (28.0 F) |
| Jul | 36.1 C (97.0 F) | -3.9 C (25.0 F) | 33.9 C (93.0 F) | 3.3 C (37.9 F) |
| Aug | 35.6 C (96.1 F) | -8.3 C (17.1 F) | 32.2 C (90.0 F) | -2.2 C (28.0 F) |
| Sep | 32.8 C (91.0 F) | -13.3 C (8.1 F) | 21.1 C (70.0 F) | -0.6 C (30.9 F) |
| Oct | 27.8 C (82.0 F) | -27.2 C (-17.0 F) | n/a | n/a |
| Nov | 20.0 C (68.0 F) | -36.7 C (-34.1 F) | n/a | n/a |
| Dec | 13.3 C (55.9 F) | -46.1 C (-51.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1937 | 15 |
| 1938 | 22 |
| 1939 | 25 |
| 1940 | 21 |
| 1941 | 17 |
| 1942 | 14 |
| 1943 | 24 |
| 1944 | 10 |
| 1945 | 12 |
| 1946 | 11 |
| 1947 | 17 |
| 1948 | 16 |
| 1949 | 21 |
| 1950 | 33 |
| 1951 | 20 |
| 1952 | 13 |
| 1953 | 19 |
| 1954 | 28 |
| 1955 | 38 |
| 1956 | 20 |
| 1957 | 14 |
| 1958 | 10 |
| 1959 | 22 |
| 1960 | 15 |
| 1961 | 13 |
| 1962 | 33 |
| 1963 | 13 |
| 1964 | 15 |
| 1965 | 20 |
| 1966 | 18 |
| 1967 | 11 |
| 1968 | 16 |
| 1969 | 16 |
| 1970 | 23 |
| 1971 | 17 |
| 1972 | 13 |
| 1973 | 7 |
| 1974 | 18 |
| 1975 | 21 |
| 1976 | 7 |
| 1977 | 8 |
| 1978 | 17 |
| 1979 | 19 |
| 1980 | 11 |
| 1981 | 6 |
| 1982 | 19 |
| 1983 | 22 |
| 1984 | 11 |
| 1985 | 23 |
| 1986 | 27 |
| 1987 | 7 |
| 1988 | 19 |
| 1989 | 13 |
| 1990 | 16 |
| 1991 | 9 |
| 1992 | 25 |
| 1993 | 19 |
| 1994 | 10 |
| 1995 | 10 |
| 1996 | 24 |
| 1997 | 9 |
| 1998 | 15 |
| 1999 | 19 |
| 2000 | 16 |
| 2001 | 21 |
| 2002 | 10 |
| 2003 | 36 |
| 2004 | 12 |
| 2005 | 14 |
| 2006 | 16 |
| 2007 | 12 |
| 2008 | 6 |
| 2009 | 6 |
| 2010 | 10 |
| 2011 | 5 |
| 2012 | 20 |
| 2013 | 17 |
| 2014 | 11 |
| 2015 | 20 |
| 2016 | 14 |
| 2017 | 17 |
| 2018 | 4 |
| 2019 | 18 |
| 2020 | 13 |
| 2021 | 13 |
| 2022 | 29 |
| 2023 | 6 |
| 2024 | 9 |
| 2025 | 13 |
| 2026 | 20 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1969-01-21 | Record daily precipitation | Record daily precipitation 73.7 mm (2.9 in) |
| 1982-01-04 | Record daily precipitation | Record daily precipitation 79.2 mm (3.1 in) |
| 1996-07-28 | Record high maximum temperature | Record high maximum temperature 36.1 C (97.0 F) |
| 1997-03-03 | Record snow depth | Record snow depth 226.1 cm (89.0 in) |
| 2004-01-01 | Record daily snowfall | Record daily snowfall 76.2 cm (30.0 in) |
Wettest Day of Each Month
Jan: 79.2 mm (3.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 79.2 mm (3.1 in) | 4 January 1982 |
| Feb | 61.2 mm (2.4 in) | 15 February 1982 |
| Mar | 41.9 mm (1.6 in) | 23 March 2018 |
| Apr | 38.1 mm (1.5 in) | 6 April 2006 |
| May | 63.5 mm (2.5 in) | 24 May 2016 |
| Jun | 54.1 mm (2.1 in) | 13 June 2022 |
| Jul | 37.8 mm (1.5 in) | 15 July 2012 |
| Aug | 49.5 mm (1.9 in) | 24 August 2009 |
| Sep | 39.6 mm (1.6 in) | 22 September 1945 |
| Oct | 47.2 mm (1.9 in) | 15 October 1938 |
| Nov | 50.0 mm (2.0 in) | 10 November 1949 |
| Dec | 43.2 mm (1.7 in) | 5 December 2012 |
Period of Record Coverage
1937 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1937 | 333 | 91% | Yes |
| 1938 | 362 | 99% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 364 | 99% | Yes |
| 1941 | 364 | 100% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 363 | 99% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 358 | 98% | Yes |
| 1946 | 364 | 100% | Yes |
| 1947 | 353 | 97% | Yes |
| 1948 | 360 | 98% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 363 | 99% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 359 | 98% | Yes |
| 1961 | 360 | 99% | Yes |
| 1962 | 340 | 93% | Yes |
| 1963 | 324 | 89% | No |
| 1964 | 360 | 98% | Yes |
| 1965 | 362 | 99% | Yes |
| 1966 | 363 | 99% | Yes |
| 1967 | 363 | 99% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 363 | 99% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 363 | 99% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 362 | 99% | Yes |
| 1979 | 329 | 90% | Yes |
| 1980 | 245 | 67% | No |
| 1981 | 177 | 48% | No |
| 1982 | 308 | 84% | No |
| 1983 | 330 | 90% | Yes |
| 1984 | 357 | 98% | Yes |
| 1985 | 344 | 94% | Yes |
| 1986 | 312 | 85% | No |
| 1987 | 89 | 24% | No |
| 1988 | 181 | 49% | No |
| 1989 | 340 | 93% | Yes |
| 1990 | 355 | 97% | Yes |
| 1991 | 358 | 98% | Yes |
| 1992 | 347 | 95% | Yes |
| 1993 | 352 | 96% | Yes |
| 1994 | 286 | 78% | No |
| 1995 | 293 | 80% | No |
| 1996 | 308 | 84% | No |
| 1997 | 351 | 96% | Yes |
| 1998 | 347 | 95% | Yes |
| 1999 | 348 | 95% | Yes |
| 2000 | 350 | 96% | Yes |
| 2001 | 345 | 95% | Yes |
| 2002 | 319 | 87% | No |
| 2003 | 328 | 90% | No |
| 2004 | 353 | 96% | Yes |
| 2005 | 358 | 98% | Yes |
| 2006 | 359 | 98% | Yes |
| 2007 | 346 | 95% | Yes |
| 2008 | 317 | 87% | No |
| 2009 | 297 | 81% | No |
| 2010 | 361 | 99% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 361 | 99% | Yes |
| 2013 | 349 | 96% | Yes |
| 2014 | 317 | 87% | No |
| 2015 | 362 | 99% | Yes |
| 2016 | 331 | 90% | Yes |
| 2017 | 357 | 98% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 352 | 96% | Yes |
| 2024 | 361 | 99% | Yes |
| 2025 | 359 | 98% | Yes |
| 2026 | 244 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 August 2026 | Island Park, US | daily high min (Tie, Provisional) | 11.1 C (52.0 F) | tie | 0 years | 2 of 100 (Routine) |
| 21 August 2026 | Island Park, US | daily high max (Provisional) | 32.2 C (90.0 F) | 1.1 C (2.0 F) | 32 years | 20 of 100 (Routine) |
| 21 August 2026 | Island Park, US | daily high min (Provisional) | 13.9 C (57.0 F) | 1.7 C (3.1 F) | 0 years | 13 of 100 (Routine) |
| 26 July 2026 | Island Park, US | daily high min (Tie) | 14.4 C (57.9 F) | tie | 36 years | 5 of 100 (Routine) |
| 23 July 2026 | Island Park, US | daily rain | 19.3 mm (0.8 in) | 5.8 mm (0.23 in) | 43 years | 20 of 100 (Routine) |
| 21 July 2026 | Island Park, US | daily high min | 15.6 C (60.1 F) | 2.8 C (5.0 F) | 69 years | 37 of 100 (Notable) |
| 20 July 2026 | Island Park, US | daily high min | 15.6 C (60.1 F) | 1.2 C (2.2 F) | 87 years | 38 of 100 (Notable) |
| 16 July 2026 | Island Park, US | daily high min | 15.6 C (60.1 F) | 2.8 C (5.0 F) | 85 years | 42 of 100 (Notable) |
| 15 July 2026 | Island Park, US | daily high min | 14.4 C (57.9 F) | 1.1 C (2.0 F) | 88 years | 38 of 100 (Notable) |
| 13 July 2026 | Island Park, US | daily high max (Tie) | 31.7 C (89.1 F) | tie | 87 years | 8 of 100 (Routine) |
| 12 July 2026 | Island Park, US | daily high max | 33.9 C (93.0 F) | 1.1 C (2.0 F) | 23 years | 18 of 100 (Routine) |
| 30 June 2026 | Island Park, US | daily rain | 13.7 mm (0.5 in) | 5.1 mm (0.20 in) | 16 years | 19 of 100 (Routine) |
| 29 June 2026 | Island Park, US | daily low max | 10.0 C (50.0 F) | 1.1 C (2.0 F) | 79 years | 34 of 100 (Routine) |
| 28 June 2026 | Island Park, US | daily low max | 9.4 C (48.9 F) | 2.3 C (4.1 F) | 80 years | 37 of 100 (Notable) |
| 18 May 2026 | Island Park, US | daily low min | -7.8 C (18.0 F) | 1.7 C (3.1 F) | 23 years | 19 of 100 (Routine) |
| 23 April 2026 | Island Park, US | daily rain | 22.1 mm (0.9 in) | 3.3 mm (0.13 in) | 32 years | 20 of 100 (Routine) |
| 21 April 2026 | Island Park, US | daily high max | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 9 years | 12 of 100 (Routine) |
| 7 April 2026 | Island Park, US | daily high max | 16.7 C (62.1 F) | 0.6 C (1.1 F) | 83 years | 34 of 100 (Routine) |
| 6 April 2026 | Island Park, US | daily high max | 16.1 C (61.0 F) | 0.5 C (0.9 F) | 65 years | 29 of 100 (Routine) |
| 28 March 2026 | Island Park, US | daily high max | 15.6 C (60.1 F) | 0.6 C (1.1 F) | 80 years | 34 of 100 (Routine) |
Climate Trend
66 complete years, 1938 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1938 | 2.9 C | +0.04 C |
| 1939 | 3.9 C | +0.99 C |
| 1940 | 4.2 C | +1.34 C |
| 1941 | 3.6 C | +0.68 C |
| 1942 | 2.3 C | -0.61 C |
| 1943 | 3.0 C | +0.15 C |
| 1944 | 2.4 C | -0.50 C |
| 1945 | 2.5 C | -0.39 C |
| 1946 | 3.0 C | +0.13 C |
| 1948 | 2.1 C | -0.77 C |
| 1949 | 2.4 C | -0.46 C |
| 1950 | 2.5 C | -0.40 C |
| 1951 | 1.6 C | -1.31 C |
| 1952 | 2.3 C | -0.57 C |
| 1953 | 3.6 C | +0.75 C |
| 1954 | 3.2 C | +0.34 C |
| 1955 | 1.4 C | -1.45 C |
| 1956 | 2.1 C | -0.73 C |
| 1957 | 2.3 C | -0.56 C |
| 1958 | 3.9 C | +1.04 C |
| 1959 | 2.4 C | -0.48 C |
| 1960 | 2.7 C | -0.22 C |
| 1961 | 2.6 C | -0.31 C |
| 1964 | 1.0 C | -1.85 C |
| 1965 | 1.8 C | -1.04 C |
| 1966 | 2.9 C | +0.07 C |
| 1967 | 2.5 C | -0.36 C |
| 1968 | 1.8 C | -1.04 C |
| 1969 | 2.3 C | -0.56 C |
| 1970 | 2.1 C | -0.80 C |
| 1971 | 2.2 C | -0.69 C |
| 1972 | 2.6 C | -0.27 C |
| 1973 | 2.8 C | -0.08 C |
| 1974 | 3.2 C | +0.33 C |
| 1975 | 1.8 C | -1.04 C |
| 1976 | 2.2 C | -0.71 C |
| 1977 | 2.5 C | -0.41 C |
| 1978 | 2.4 C | -0.48 C |
| 1984 | 1.6 C | -1.24 C |
| 1990 | 3.2 C | +0.37 C |
| 1991 | 3.3 C | +0.44 C |
| 1992 | 4.0 C | +1.13 C |
| 1993 | 2.0 C | -0.92 C |
| 1997 | 3.5 C | +0.63 C |
| 1998 | 4.6 C | +1.71 C |
| 1999 | 4.0 C | +1.12 C |
| 2000 | 3.5 C | +0.64 C |
| 2001 | 4.1 C | +1.18 C |
| 2004 | 3.8 C | +0.95 C |
| 2005 | 3.5 C | +0.60 C |
| 2006 | 4.0 C | +1.11 C |
| 2007 | 4.2 C | +1.32 C |
| 2010 | 3.6 C | +0.76 C |
| 2011 | 2.7 C | -0.21 C |
| 2012 | 3.7 C | +0.80 C |
| 2013 | 2.6 C | -0.29 C |
| 2015 | 3.7 C | +0.86 C |
| 2017 | 3.3 C | +0.42 C |
| 2018 | 2.5 C | -0.40 C |
| 2019 | 1.8 C | -1.12 C |
| 2020 | 2.6 C | -0.25 C |
| 2021 | 3.9 C | +1.05 C |
| 2022 | 1.9 C | -0.96 C |
| 2023 | 2.9 C | 0.00 C |
| 2024 | 4.2 C | +1.29 C |
| 2025 | 4.3 C | +1.42 C |
The annual mean temperature here has risen by 0.10 C (0.03 to 0.17) per decade over 1938 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 66 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.10 C (0.03 to 0.17) per decade | 0.2 F (0.1 to 0.3) per decade | 1938 to 2025 | 66 | Rise |
| Mean daily maximum | 0.05 C (-0.03 to 0.13) per decade | 0.1 F (-0.1 to 0.2) per decade | 1938 to 2025 | 66 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1938 to 2025 | 66 | Rise |
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
1937 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.1 C (97.0 F) | 1996 | 31.7 C (89.1 F) | 90 |
| Coldest night (TNn) | -51.1 C (-60.0 F) | 1943 | -36.1 C (-33.0 F) | 90 |
| Wettest day (Rx1day) | 79.2 mm (3.1 in) | 1982 | 32.8 mm (1.3 in) | 90 |
| Wettest five days (Rx5day) | 159.4 mm (6.3 in) | 1969 | 60.3 mm (2.4 in) | 90 |
| Longest dry spell (CDD) | 79 days | 2013 | 24 days | 90 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1937 | 31.1 C (88.0 F) |
| 1938 | 28.9 C (84.0 F) |
| 1939 | 32.2 C (90.0 F) |
| 1940 | 33.9 C (93.0 F) |
| 1941 | 32.2 C (90.0 F) |
| 1942 | 31.1 C (88.0 F) |
| 1943 | 31.7 C (89.1 F) |
| 1944 | 28.9 C (84.0 F) |
| 1945 | 30.0 C (86.0 F) |
| 1946 | 32.2 C (90.0 F) |
| 1947 | 30.0 C (86.0 F) |
| 1948 | 32.2 C (90.0 F) |
| 1949 | 32.2 C (90.0 F) |
| 1950 | 32.8 C (91.0 F) |
| 1951 | 31.1 C (88.0 F) |
| 1952 | 30.0 C (86.0 F) |
| 1953 | 31.7 C (89.1 F) |
| 1954 | 32.2 C (90.0 F) |
| 1955 | 32.2 C (90.0 F) |
| 1956 | 31.1 C (88.0 F) |
| 1957 | 30.0 C (86.0 F) |
| 1958 | 31.1 C (88.0 F) |
| 1959 | 31.7 C (89.1 F) |
| 1960 | 34.4 C (93.9 F) |
| 1961 | 35.6 C (96.1 F) |
| 1962 | 30.0 C (86.0 F) |
| 1963 | 32.2 C (90.0 F) |
| 1964 | 30.0 C (86.0 F) |
| 1965 | 30.6 C (87.1 F) |
| 1966 | 32.8 C (91.0 F) |
| 1967 | 30.6 C (87.1 F) |
| 1968 | 30.0 C (86.0 F) |
| 1969 | 32.8 C (91.0 F) |
| 1970 | 31.1 C (88.0 F) |
| 1971 | 32.2 C (90.0 F) |
| 1972 | 31.7 C (89.1 F) |
| 1973 | 31.1 C (88.0 F) |
| 1974 | 32.8 C (91.0 F) |
| 1975 | 30.6 C (87.1 F) |
| 1976 | 31.1 C (88.0 F) |
| 1977 | 30.6 C (87.1 F) |
| 1978 | 32.2 C (90.0 F) |
| 1979 | 33.3 C (91.9 F) |
| 1980 | 28.9 C (84.0 F) |
| 1981 | 22.2 C (72.0 F) |
| 1982 | 30.6 C (87.1 F) |
| 1983 | 29.4 C (84.9 F) |
| 1984 | 31.1 C (88.0 F) |
| 1985 | 31.7 C (89.1 F) |
| 1986 | 29.4 C (84.9 F) |
| 1987 | 12.2 C (54.0 F) |
| 1988 | 33.9 C (93.0 F) |
| 1989 | 31.7 C (89.1 F) |
| 1990 | 32.2 C (90.0 F) |
| 1991 | 31.1 C (88.0 F) |
| 1992 | 31.1 C (88.0 F) |
| 1993 | 26.7 C (80.1 F) |
| 1994 | 33.3 C (91.9 F) |
| 1995 | 29.4 C (84.9 F) |
| 1996 | 36.1 C (97.0 F) |
| 1997 | 32.8 C (91.0 F) |
| 1998 | 32.2 C (90.0 F) |
| 1999 | 32.2 C (90.0 F) |
| 2000 | 35.6 C (96.1 F) |
| 2001 | 33.9 C (93.0 F) |
| 2002 | 32.8 C (91.0 F) |
| 2003 | 35.0 C (95.0 F) |
| 2004 | 31.7 C (89.1 F) |
| 2005 | 30.6 C (87.1 F) |
| 2006 | 31.1 C (88.0 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 30.0 C (86.0 F) |
| 2009 | 30.6 C (87.1 F) |
| 2010 | 29.4 C (84.9 F) |
| 2011 | 30.0 C (86.0 F) |
| 2012 | 31.7 C (89.1 F) |
| 2013 | 32.8 C (91.0 F) |
| 2014 | 30.0 C (86.0 F) |
| 2015 | 32.2 C (90.0 F) |
| 2016 | 30.6 C (87.1 F) |
| 2017 | 32.2 C (90.0 F) |
| 2018 | 32.8 C (91.0 F) |
| 2019 | 31.7 C (89.1 F) |
| 2020 | 32.2 C (90.0 F) |
| 2021 | 32.2 C (90.0 F) |
| 2022 | 32.2 C (90.0 F) |
| 2023 | 31.7 C (89.1 F) |
| 2024 | 32.2 C (90.0 F) |
| 2025 | 30.6 C (87.1 F) |
| 2026 | 33.9 C (93.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1937 | -37.2 C (-35.0 F) |
| 1938 | -34.4 C (-29.9 F) |
| 1939 | -31.1 C (-24.0 F) |
| 1940 | -33.9 C (-29.0 F) |
| 1941 | -34.4 C (-29.9 F) |
| 1942 | -43.9 C (-47.0 F) |
| 1943 | -51.1 C (-60.0 F) |
| 1944 | -33.9 C (-29.0 F) |
| 1945 | -37.8 C (-36.0 F) |
| 1946 | -31.7 C (-25.1 F) |
| 1947 | -41.1 C (-42.0 F) |
| 1948 | -38.3 C (-36.9 F) |
| 1949 | -42.8 C (-45.0 F) |
| 1950 | -40.6 C (-41.1 F) |
| 1951 | -43.3 C (-45.9 F) |
| 1952 | -37.2 C (-35.0 F) |
| 1953 | -35.6 C (-32.1 F) |
| 1954 | -36.1 C (-33.0 F) |
| 1955 | -37.8 C (-36.0 F) |
| 1956 | -42.2 C (-44.0 F) |
| 1957 | -39.4 C (-38.9 F) |
| 1958 | -32.2 C (-26.0 F) |
| 1959 | -37.8 C (-36.0 F) |
| 1960 | -38.9 C (-38.0 F) |
| 1961 | -38.9 C (-38.0 F) |
| 1962 | -43.3 C (-45.9 F) |
| 1963 | -41.7 C (-43.1 F) |
| 1964 | -46.1 C (-51.0 F) |
| 1965 | -35.0 C (-31.0 F) |
| 1966 | -37.8 C (-36.0 F) |
| 1967 | -33.9 C (-29.0 F) |
| 1968 | -37.8 C (-36.0 F) |
| 1969 | -31.7 C (-25.1 F) |
| 1970 | -40.6 C (-41.1 F) |
| 1971 | -37.2 C (-35.0 F) |
| 1972 | -41.7 C (-43.1 F) |
| 1973 | -38.9 C (-38.0 F) |
| 1974 | -36.7 C (-34.1 F) |
| 1975 | -38.3 C (-36.9 F) |
| 1976 | -32.2 C (-26.0 F) |
| 1977 | -34.4 C (-29.9 F) |
| 1978 | -42.2 C (-44.0 F) |
| 1979 | -42.2 C (-44.0 F) |
| 1980 | -40.6 C (-41.1 F) |
| 1981 | -42.2 C (-44.0 F) |
| 1982 | -47.8 C (-54.0 F) |
| 1983 | -40.6 C (-41.1 F) |
| 1984 | -40.6 C (-41.1 F) |
| 1985 | -43.3 C (-45.9 F) |
| 1986 | -30.6 C (-23.1 F) |
| 1987 | -33.9 C (-29.0 F) |
| 1988 | -23.3 C (-9.9 F) |
| 1989 | -34.4 C (-29.9 F) |
| 1990 | -36.1 C (-33.0 F) |
| 1991 | -36.1 C (-33.0 F) |
| 1992 | -33.3 C (-27.9 F) |
| 1993 | -35.6 C (-32.1 F) |
| 1994 | -30.0 C (-22.0 F) |
| 1995 | -37.2 C (-35.0 F) |
| 1996 | -37.8 C (-36.0 F) |
| 1997 | -31.1 C (-24.0 F) |
| 1998 | -37.2 C (-35.0 F) |
| 1999 | -30.6 C (-23.1 F) |
| 2000 | -28.9 C (-20.0 F) |
| 2001 | -32.8 C (-27.0 F) |
| 2002 | -36.1 C (-33.0 F) |
| 2003 | -35.6 C (-32.1 F) |
| 2004 | -35.6 C (-32.1 F) |
| 2005 | -35.6 C (-32.1 F) |
| 2006 | -30.6 C (-23.1 F) |
| 2007 | -34.4 C (-29.9 F) |
| 2008 | -37.2 C (-35.0 F) |
| 2009 | -38.3 C (-36.9 F) |
| 2010 | -30.6 C (-23.1 F) |
| 2011 | -35.6 C (-32.1 F) |
| 2012 | -28.9 C (-20.0 F) |
| 2013 | -33.9 C (-29.0 F) |
| 2014 | -31.1 C (-24.0 F) |
| 2015 | -31.1 C (-24.0 F) |
| 2016 | -28.3 C (-18.9 F) |
| 2017 | -33.3 C (-27.9 F) |
| 2018 | -32.2 C (-26.0 F) |
| 2019 | -31.7 C (-25.1 F) |
| 2020 | -30.6 C (-23.1 F) |
| 2021 | -32.2 C (-26.0 F) |
| 2022 | -38.9 C (-38.0 F) |
| 2023 | -36.1 C (-33.0 F) |
| 2024 | -38.9 C (-38.0 F) |
| 2025 | -34.4 C (-29.9 F) |
| 2026 | -28.3 C (-18.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1937 | 20.3 mm (0.8 in) |
| 1938 | 47.2 mm (1.9 in) |
| 1939 | 20.1 mm (0.8 in) |
| 1940 | 25.9 mm (1.0 in) |
| 1941 | 27.4 mm (1.1 in) |
| 1942 | 26.4 mm (1.0 in) |
| 1943 | 46.2 mm (1.8 in) |
| 1944 | 43.2 mm (1.7 in) |
| 1945 | 39.6 mm (1.6 in) |
| 1946 | 41.9 mm (1.6 in) |
| 1947 | 34.5 mm (1.4 in) |
| 1948 | 32.0 mm (1.3 in) |
| 1949 | 50.0 mm (2.0 in) |
| 1950 | 29.7 mm (1.2 in) |
| 1951 | 35.6 mm (1.4 in) |
| 1952 | 37.3 mm (1.5 in) |
| 1953 | 23.6 mm (0.9 in) |
| 1954 | 50.0 mm (2.0 in) |
| 1955 | 28.2 mm (1.1 in) |
| 1956 | 26.7 mm (1.1 in) |
| 1957 | 37.1 mm (1.5 in) |
| 1958 | 29.7 mm (1.2 in) |
| 1959 | 38.1 mm (1.5 in) |
| 1960 | 19.8 mm (0.8 in) |
| 1961 | 32.5 mm (1.3 in) |
| 1962 | 36.3 mm (1.4 in) |
| 1963 | 34.5 mm (1.4 in) |
| 1964 | 32.3 mm (1.3 in) |
| 1965 | 40.9 mm (1.6 in) |
| 1966 | 38.9 mm (1.5 in) |
| 1967 | 38.9 mm (1.5 in) |
| 1968 | 31.5 mm (1.2 in) |
| 1969 | 73.7 mm (2.9 in) |
| 1970 | 53.6 mm (2.1 in) |
| 1971 | 30.2 mm (1.2 in) |
| 1972 | 31.0 mm (1.2 in) |
| 1973 | 28.7 mm (1.1 in) |
| 1974 | 38.6 mm (1.5 in) |
| 1975 | 33.5 mm (1.3 in) |
| 1976 | 30.2 mm (1.2 in) |
| 1977 | 30.2 mm (1.2 in) |
| 1978 | 25.4 mm (1.0 in) |
| 1979 | 31.5 mm (1.2 in) |
| 1980 | 32.3 mm (1.3 in) |
| 1981 | 27.9 mm (1.1 in) |
| 1982 | 79.2 mm (3.1 in) |
| 1983 | 47.2 mm (1.9 in) |
| 1984 | 33.3 mm (1.3 in) |
| 1985 | 37.1 mm (1.5 in) |
| 1986 | 27.9 mm (1.1 in) |
| 1987 | 29.2 mm (1.1 in) |
| 1988 | 19.6 mm (0.8 in) |
| 1989 | 32.0 mm (1.3 in) |
| 1990 | 25.4 mm (1.0 in) |
| 1991 | 27.9 mm (1.1 in) |
| 1992 | 34.5 mm (1.4 in) |
| 1993 | 21.1 mm (0.8 in) |
| 1994 | 21.3 mm (0.8 in) |
| 1995 | 31.5 mm (1.2 in) |
| 1996 | 35.8 mm (1.4 in) |
| 1997 | 67.8 mm (2.7 in) |
| 1998 | 35.1 mm (1.4 in) |
| 1999 | 30.7 mm (1.2 in) |
| 2000 | 29.7 mm (1.2 in) |
| 2001 | 31.5 mm (1.2 in) |
| 2002 | 27.7 mm (1.1 in) |
| 2003 | 25.4 mm (1.0 in) |
| 2004 | 37.1 mm (1.5 in) |
| 2005 | 38.9 mm (1.5 in) |
| 2006 | 38.1 mm (1.5 in) |
| 2007 | 25.4 mm (1.0 in) |
| 2008 | 38.1 mm (1.5 in) |
| 2009 | 49.5 mm (1.9 in) |
| 2010 | 43.7 mm (1.7 in) |
| 2011 | 43.2 mm (1.7 in) |
| 2012 | 43.2 mm (1.7 in) |
| 2013 | 22.9 mm (0.9 in) |
| 2014 | 58.4 mm (2.3 in) |
| 2015 | 44.5 mm (1.8 in) |
| 2016 | 63.5 mm (2.5 in) |
| 2017 | 33.0 mm (1.3 in) |
| 2018 | 41.9 mm (1.6 in) |
| 2019 | 38.1 mm (1.5 in) |
| 2020 | 23.6 mm (0.9 in) |
| 2021 | 25.9 mm (1.0 in) |
| 2022 | 54.1 mm (2.1 in) |
| 2023 | 33.5 mm (1.3 in) |
| 2024 | 22.9 mm (0.9 in) |
| 2025 | 29.0 mm (1.1 in) |
| 2026 | 22.1 mm (0.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1937 | 34.5 mm (1.4 in) |
| 1938 | 67.6 mm (2.7 in) |
| 1939 | 54.6 mm (2.1 in) |
| 1940 | 53.6 mm (2.1 in) |
| 1941 | 71.3 mm (2.8 in) |
| 1942 | 51.8 mm (2.0 in) |
| 1943 | 130.0 mm (5.1 in) |
| 1944 | 75.0 mm (3.0 in) |
| 1945 | 95.2 mm (3.7 in) |
| 1946 | 88.2 mm (3.5 in) |
| 1947 | 40.2 mm (1.6 in) |
| 1948 | 63.0 mm (2.5 in) |
| 1949 | 85.6 mm (3.4 in) |
| 1950 | 53.7 mm (2.1 in) |
| 1951 | 59.6 mm (2.3 in) |
| 1952 | 68.4 mm (2.7 in) |
| 1953 | 59.3 mm (2.3 in) |
| 1954 | 69.6 mm (2.7 in) |
| 1955 | 73.9 mm (2.9 in) |
| 1956 | 59.1 mm (2.3 in) |
| 1957 | 66.1 mm (2.6 in) |
| 1958 | 43.9 mm (1.7 in) |
| 1959 | 58.9 mm (2.3 in) |
| 1960 | 47.0 mm (1.9 in) |
| 1961 | 58.4 mm (2.3 in) |
| 1962 | 95.8 mm (3.8 in) |
| 1963 | 66.9 mm (2.6 in) |
| 1964 | 81.0 mm (3.2 in) |
| 1965 | 70.4 mm (2.8 in) |
| 1966 | 62.5 mm (2.5 in) |
| 1967 | 90.2 mm (3.6 in) |
| 1968 | 82.9 mm (3.3 in) |
| 1969 | 159.4 mm (6.3 in) |
| 1970 | 96.3 mm (3.8 in) |
| 1971 | 84.3 mm (3.3 in) |
| 1972 | 60.0 mm (2.4 in) |
| 1973 | 55.4 mm (2.2 in) |
| 1974 | 81.8 mm (3.2 in) |
| 1975 | 75.6 mm (3.0 in) |
| 1976 | 68.1 mm (2.7 in) |
| 1977 | 56.4 mm (2.2 in) |
| 1978 | 53.9 mm (2.1 in) |
| 1979 | 67.0 mm (2.6 in) |
| 1980 | 83.1 mm (3.3 in) |
| 1981 | 45.1 mm (1.8 in) |
| 1982 | 89.4 mm (3.5 in) |
| 1983 | 84.1 mm (3.3 in) |
| 1984 | 83.1 mm (3.3 in) |
| 1985 | 51.5 mm (2.0 in) |
| 1986 | 30.3 mm (1.2 in) |
| 1987 | 30.7 mm (1.2 in) |
| 1988 | 39.4 mm (1.6 in) |
| 1989 | 49.0 mm (1.9 in) |
| 1990 | 56.6 mm (2.2 in) |
| 1991 | 67.4 mm (2.7 in) |
| 1992 | 66.4 mm (2.6 in) |
| 1993 | 56.6 mm (2.2 in) |
| 1994 | 52.3 mm (2.1 in) |
| 1995 | 56.9 mm (2.2 in) |
| 1996 | 77.7 mm (3.1 in) |
| 1997 | 84.3 mm (3.3 in) |
| 1998 | 62.0 mm (2.4 in) |
| 1999 | 64.3 mm (2.5 in) |
| 2000 | 41.8 mm (1.6 in) |
| 2001 | 60.6 mm (2.4 in) |
| 2002 | 49.8 mm (2.0 in) |
| 2003 | 54.4 mm (2.1 in) |
| 2004 | 91.5 mm (3.6 in) |
| 2005 | 67.7 mm (2.7 in) |
| 2006 | 71.9 mm (2.8 in) |
| 2007 | 55.2 mm (2.2 in) |
| 2008 | 64.9 mm (2.6 in) |
| 2009 | 50.0 mm (2.0 in) |
| 2010 | 55.9 mm (2.2 in) |
| 2011 | 50.8 mm (2.0 in) |
| 2012 | 38.3 mm (1.5 in) |
| 2013 | 28.0 mm (1.1 in) |
| 2014 | 58.4 mm (2.3 in) |
| 2015 | 50.9 mm (2.0 in) |
| 2016 | 81.3 mm (3.2 in) |
| 2017 | 40.7 mm (1.6 in) |
| 2018 | 59.1 mm (2.3 in) |
| 2019 | 68.5 mm (2.7 in) |
| 2020 | 51.3 mm (2.0 in) |
| 2021 | 67.0 mm (2.6 in) |
| 2022 | 66.8 mm (2.6 in) |
| 2023 | 59.9 mm (2.4 in) |
| 2024 | 43.4 mm (1.7 in) |
| 2025 | 57.6 mm (2.3 in) |
| 2026 | 36.1 mm (1.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1937 | 19 days |
| 1938 | 22 days |
| 1939 | 42 days |
| 1940 | 25 days |
| 1941 | 19 days |
| 1942 | 28 days |
| 1943 | 23 days |
| 1944 | 28 days |
| 1945 | 21 days |
| 1946 | 24 days |
| 1947 | 35 days |
| 1948 | 24 days |
| 1949 | 23 days |
| 1950 | 25 days |
| 1951 | 25 days |
| 1952 | 61 days |
| 1953 | 27 days |
| 1954 | 37 days |
| 1955 | 22 days |
| 1956 | 24 days |
| 1957 | 18 days |
| 1958 | 25 days |
| 1959 | 25 days |
| 1960 | 21 days |
| 1961 | 21 days |
| 1962 | 19 days |
| 1963 | 20 days |
| 1964 | 24 days |
| 1965 | 27 days |
| 1966 | 24 days |
| 1967 | 18 days |
| 1968 | 23 days |
| 1969 | 22 days |
| 1970 | 36 days |
| 1971 | 20 days |
| 1972 | 13 days |
| 1973 | 15 days |
| 1974 | 43 days |
| 1975 | 22 days |
| 1976 | 29 days |
| 1977 | 24 days |
| 1978 | 40 days |
| 1979 | 25 days |
| 1980 | 19 days |
| 1981 | 18 days |
| 1982 | 16 days |
| 1983 | 20 days |
| 1984 | 17 days |
| 1985 | 20 days |
| 1986 | 23 days |
| 1987 | 12 days |
| 1988 | 33 days |
| 1989 | 23 days |
| 1990 | 26 days |
| 1991 | 22 days |
| 1992 | 21 days |
| 1993 | 37 days |
| 1994 | 23 days |
| 1995 | 18 days |
| 1996 | 26 days |
| 1997 | 16 days |
| 1998 | 26 days |
| 1999 | 38 days |
| 2000 | 21 days |
| 2001 | 24 days |
| 2002 | 28 days |
| 2003 | 28 days |
| 2004 | 27 days |
| 2005 | 34 days |
| 2006 | 17 days |
| 2007 | 48 days |
| 2008 | 50 days |
| 2009 | 36 days |
| 2010 | 27 days |
| 2011 | 19 days |
| 2012 | 33 days |
| 2013 | 79 days |
| 2014 | 28 days |
| 2015 | 42 days |
| 2016 | 18 days |
| 2017 | 29 days |
| 2018 | 14 days |
| 2019 | 29 days |
| 2020 | 20 days |
| 2021 | 27 days |
| 2022 | 30 days |
| 2023 | 18 days |
| 2024 | 27 days |
| 2025 | 28 days |
| 2026 | 30 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
66 years with a frostAcross 66 years with a frost, the median last spring frost at Island Park falls on 24 June and the median first autumn frost on 31 July, which leaves a median of 43 days between them.
In 1977 to 2025 the median growing season was 58 days. That is 41 days more than in 1938 to 1970.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
| Measure | Median, all years | Earliest period (1938 to 1970) | Recent period (1977 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 June | 27 June | 21 June | 6 days earlier | -0.7 days per decade |
| First autumn frost | 31 July | 15 July | 16 August | 32 days later | +2.8 days per decade |
| Growing days | 43 days | 17 days | 58 days | 41 days more | +3.5 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
63 years, 1939 to 2025A day with at least 32.4 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 67.0 mm (2.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 32.4 mm (1.3 in) | |
| 5 years | 40.5 mm (1.6 in) | |
| 10 years | 46.4 mm (1.8 in) | |
| 25 years | 54.2 mm (2.1 in) | |
| 50 years | 60.5 mm (2.4 in) | |
| 100 years | 67.0 mm (2.6 in) | Longer than the 63 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, 63 years of values from 1939 to 2025.
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: 73.7 mm (2.9 in) in 1969; 67.8 mm (2.7 in) in 1997; 53.6 mm (2.1 in) in 1970.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).