Rock Springs AP Weather Records (USW00024027)
Record envelope, standing records and threshold days for Rock Springs AP (USW00024027), Wyoming, United States, with 79 years of record.
Key Facts for Rock Springs AP
- Rock Springs AP (USW00024027) is a weather station in Wyoming, United States at 41.59 latitude and -109.05 longitude, 2,060 m (6,758 ft) above sea level.
- The station reports from 1948 to 2026, 79 years of record.
- 1,464 records set at Rock Springs AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Rock Springs AP set a daily record high minimum temperature of 11.1 C (52.0 F) on 10 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Wyoming, United States, 41.59 latitude, -109.05 longitude.
- Elevation: 2,060 m (6,758 ft).
- Period of record: 1948 to 2026, 79 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
36 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 12.8 C (55.0 F) | -38.3 C (-36.9 F) | 10.6 C (51.1 F) | -18.3 C (-0.9 F) |
| Feb | 15.6 C (60.1 F) | -33.9 C (-29.0 F) | 12.8 C (55.0 F) | -15.6 C (3.9 F) |
| Mar | 25.6 C (78.1 F) | -24.4 C (-11.9 F) | 25.6 C (78.1 F) | -10.6 C (12.9 F) |
| Apr | 26.1 C (79.0 F) | -16.7 C (1.9 F) | 23.3 C (73.9 F) | -8.9 C (16.0 F) |
| May | 32.2 C (90.0 F) | -10.0 C (14.0 F) | 28.3 C (82.9 F) | -4.4 C (24.1 F) |
| Jun | 35.6 C (96.1 F) | -3.3 C (26.1 F) | 32.2 C (90.0 F) | 0.6 C (33.1 F) |
| Jul | 36.7 C (98.1 F) | 1.7 C (35.1 F) | 36.7 C (98.1 F) | 6.1 C (43.0 F) |
| Aug | 36.1 C (97.0 F) | 0.6 C (33.1 F) | 36.1 C (97.0 F) | 7.2 C (45.0 F) |
| Sep | 33.9 C (93.0 F) | -15.0 C (5.0 F) | 29.4 C (84.9 F) | 2.2 C (36.0 F) |
| Oct | 28.3 C (82.9 F) | -23.2 C (-9.8 F) | 26.7 C (80.1 F) | 6.7 C (44.1 F) |
| Nov | 18.9 C (66.0 F) | -25.0 C (-13.0 F) | n/a | n/a |
| Dec | 15.0 C (59.0 F) | -33.9 C (-29.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1948 | 21 |
| 1949 | 15 |
| 1950 | 21 |
| 1951 | 19 |
| 1952 | 17 |
| 1953 | 14 |
| 1954 | 25 |
| 1955 | 21 |
| 1956 | 12 |
| 1957 | 11 |
| 1958 | 16 |
| 1959 | 22 |
| 1960 | 24 |
| 1961 | 13 |
| 1962 | 31 |
| 1963 | 19 |
| 1964 | 27 |
| 1965 | 20 |
| 1966 | 26 |
| 1967 | 14 |
| 1968 | 11 |
| 1969 | 32 |
| 1970 | 23 |
| 1971 | 18 |
| 1972 | 19 |
| 1973 | 16 |
| 1974 | 18 |
| 1975 | 28 |
| 1976 | 16 |
| 1977 | 17 |
| 1978 | 19 |
| 1979 | 23 |
| 1980 | 22 |
| 1981 | 16 |
| 1982 | 4 |
| 1983 | 3 |
| 1984 | 9 |
| 1985 | 26 |
| 1986 | 16 |
| 1987 | 15 |
| 1988 | 15 |
| 1989 | 29 |
| 1990 | 23 |
| 1991 | 14 |
| 1992 | 14 |
| 1993 | 25 |
| 1994 | 11 |
| 1995 | 15 |
| 1996 | 21 |
| 1997 | 13 |
| 1998 | 14 |
| 1999 | 13 |
| 2000 | 22 |
| 2001 | 20 |
| 2002 | 17 |
| 2003 | 32 |
| 2004 | 12 |
| 2005 | 9 |
| 2006 | 22 |
| 2007 | 20 |
| 2008 | 5 |
| 2009 | 11 |
| 2010 | 11 |
| 2011 | 12 |
| 2012 | 21 |
| 2013 | 30 |
| 2014 | 19 |
| 2015 | 25 |
| 2016 | 9 |
| 2017 | 16 |
| 2018 | 11 |
| 2019 | 14 |
| 2020 | 25 |
| 2021 | 27 |
| 2022 | 21 |
| 2023 | 14 |
| 2024 | 14 |
| 2025 | 37 |
| 2026 | 42 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1979-01-26 | Record snow depth | Record snow depth 35.6 cm (14.0 in) |
| 1980-01-30 | Record snow depth | Record snow depth 38.1 cm (15.0 in) |
| 1985-07-11 | Record high minimum temperature | Record high minimum temperature 18.9 C (66.0 F) |
| 1988-03-10 | Record daily snowfall | Record daily snowfall 33.3 cm (13.1 in) |
| 1997-01-13 | Record snow depth | Record snow depth 43.2 cm (17.0 in) |
| 2001-02-07 | Record daily snowfall | Record daily snowfall 55.4 cm (21.8 in) |
| 2001-02-08 | Record snow depth | Record snow depth 55.9 cm (22.0 in) |
| 2002-07-13 | Record high maximum temperature | Record high maximum temperature 36.7 C (98.1 F) |
| 2024-08-04 | Record high minimum temperature | Record high minimum temperature 19.4 C (66.9 F) |
Wettest Day of Each Month
Sep: 50.8 mm (2.0 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 21.1 mm (0.8 in) | 17 January 1996 |
| Feb | 15.0 mm (0.6 in) | 7 February 2001 |
| Mar | 24.4 mm (1.0 in) | 2 March 1977 |
| Apr | 49.8 mm (2.0 in) | 20 April 1971 |
| May | 43.4 mm (1.7 in) | 30 May 1971 |
| Jun | 41.7 mm (1.6 in) | 11 June 1970 |
| Jul | 36.1 mm (1.4 in) | 24 July 1991 |
| Aug | 29.7 mm (1.2 in) | 2 August 2007 |
| Sep | 50.8 mm (2.0 in) | 11 September 1973 |
| Oct | 24.4 mm (1.0 in) | 3 October 1994 |
| Nov | 24.1 mm (0.9 in) | 1 November 2011 |
| Dec | 23.9 mm (0.9 in) | 12 December 1975 |
Period of Record Coverage
1948 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1948 | 365 | 100% | 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 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | 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 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 60 | 16% | No |
| 1983 | 77 | 21% | No |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 334 | 92% | 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 | 363 | 99% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 364 | 99% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 353 | 97% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 361 | 99% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 364 | 100% | Yes |
| 2022 | 359 | 98% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 363 | 99% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 October 2026 | Rock Springs AP, US | daily high min (Provisional) | 11.1 C (52.0 F) | 0.5 C (0.9 F) | 0 years | 8 of 100 (Routine) |
| 9 October 2026 | Rock Springs AP, US | daily high min (Provisional) | 10.6 C (51.1 F) | 0.6 C (1.1 F) | 63 years | 26 of 100 (Routine) |
| 8 October 2026 | Rock Springs AP, US | daily high max (Provisional) | 25.0 C (77.0 F) | 0.6 C (1.1 F) | 5 years | 8 of 100 (Routine) |
| 7 October 2026 | Rock Springs AP, US | daily high max (Tie, Provisional) | 25.6 C (78.1 F) | tie | 69 years | 6 of 100 (Routine) |
| 6 October 2026 | Rock Springs AP, US | daily high min (Provisional) | 12.2 C (54.0 F) | 3.9 C (7.0 F) | 68 years | 35 of 100 (Notable) |
| 6 October 2026 | Rock Springs AP, US | daily high max (Provisional) | 26.1 C (79.0 F) | 0.5 C (0.9 F) | 51 years | 22 of 100 (Routine) |
| 5 October 2026 | Rock Springs AP, US | daily high max (Provisional) | 26.7 C (80.1 F) | 2.3 C (4.1 F) | 51 years | 25 of 100 (Routine) |
| 17 September 2026 | Rock Springs AP, US | daily high min (Tie, Provisional) | 12.2 C (54.0 F) | tie | 25 years | 3 of 100 (Routine) |
| 29 August 2026 | Rock Springs AP, US | daily rain (Provisional) | 8.4 mm (0.33 in) | 2.3 mm (0.09 in) | 76 years | 20 of 100 (Routine) |
| 27 August 2026 | Rock Springs AP, US | daily high max (Tie, Provisional) | 32.2 C (90.0 F) | tie | 15 years | 2 of 100 (Routine) |
| 23 August 2026 | Rock Springs AP, US | daily high min (Tie, Provisional) | 15.6 C (60.1 F) | tie | 5 years | 2 of 100 (Routine) |
| 22 August 2026 | Rock Springs AP, US | daily high min (Provisional) | 17.2 C (63.0 F) | 1.6 C (2.9 F) | 13 years | 16 of 100 (Routine) |
| 21 August 2026 | Rock Springs AP, US | daily high max (Provisional) | 33.9 C (93.0 F) | 0.6 C (1.1 F) | 23 years | 14 of 100 (Routine) |
| 11 August 2026 | Rock Springs AP, US | daily high min | 18.9 C (66.0 F) | 1.7 C (3.1 F) | 56 years | 30 of 100 (Routine) |
| 8 August 2026 | Rock Springs AP, US | daily high max (Tie) | 33.3 C (91.9 F) | tie | 68 years | 6 of 100 (Routine) |
| 8 August 2026 | Rock Springs AP, US | daily high min (Tie) | 16.7 C (62.1 F) | tie | 24 years | 3 of 100 (Routine) |
| 7 August 2026 | Rock Springs AP, US | daily high max | 35.0 C (95.0 F) | 1.7 C (3.1 F) | 56 years | 28 of 100 (Routine) |
| 2 August 2026 | Rock Springs AP, US | monthly high max | 36.1 C (97.0 F) | 0.5 C (0.9 F) | 22 years | 24 of 100 (Routine) |
| 1 August 2026 | Rock Springs AP, US | daily high max (Tie) | 34.4 C (93.9 F) | tie | 17 years | 3 of 100 (Routine) |
| 26 July 2026 | Rock Springs AP, US | all-time high max (Tie) | 36.7 C (98.1 F) | tie | 24 years | 8 of 100 (Routine) |
Climate Trend
75 complete years, 1948 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1948 | 5.6 C | -0.65 C |
| 1949 | 5.6 C | -0.68 C |
| 1950 | 5.8 C | -0.50 C |
| 1951 | 5.1 C | -1.17 C |
| 1952 | 5.7 C | -0.55 C |
| 1953 | 7.1 C | +0.83 C |
| 1954 | 7.4 C | +1.15 C |
| 1955 | 5.7 C | -0.60 C |
| 1956 | 6.6 C | +0.33 C |
| 1957 | 5.7 C | -0.60 C |
| 1958 | 6.7 C | +0.45 C |
| 1959 | 5.9 C | -0.34 C |
| 1960 | 5.6 C | -0.68 C |
| 1961 | 5.2 C | -1.08 C |
| 1962 | 5.7 C | -0.57 C |
| 1963 | 6.3 C | +0.07 C |
| 1964 | 4.5 C | -1.73 C |
| 1965 | 5.0 C | -1.23 C |
| 1966 | 5.9 C | -0.31 C |
| 1967 | 6.0 C | -0.21 C |
| 1968 | 5.4 C | -0.86 C |
| 1969 | 6.2 C | -0.02 C |
| 1970 | 5.8 C | -0.46 C |
| 1971 | 5.6 C | -0.69 C |
| 1972 | 5.9 C | -0.31 C |
| 1973 | 5.1 C | -1.12 C |
| 1974 | 6.4 C | +0.17 C |
| 1975 | 5.4 C | -0.81 C |
| 1976 | 6.5 C | +0.25 C |
| 1977 | 7.1 C | +0.87 C |
| 1978 | 5.7 C | -0.57 C |
| 1979 | 5.4 C | -0.84 C |
| 1980 | 6.3 C | +0.09 C |
| 1981 | 7.1 C | +0.89 C |
| 1984 | 4.9 C | -1.39 C |
| 1985 | 5.7 C | -0.54 C |
| 1987 | 6.6 C | +0.35 C |
| 1988 | 7.1 C | +0.80 C |
| 1989 | 6.3 C | +0.08 C |
| 1990 | 6.8 C | +0.53 C |
| 1991 | 5.9 C | -0.39 C |
| 1992 | 6.4 C | +0.10 C |
| 1993 | 4.1 C | -2.14 C |
| 1994 | 6.7 C | +0.49 C |
| 1995 | 6.0 C | -0.24 C |
| 1996 | 6.2 C | -0.10 C |
| 1997 | 5.4 C | -0.82 C |
| 1998 | 6.2 C | -0.09 C |
| 1999 | 6.7 C | +0.43 C |
| 2000 | 6.6 C | +0.34 C |
| 2001 | 6.8 C | +0.56 C |
| 2002 | 6.3 C | +0.09 C |
| 2003 | 7.4 C | +1.14 C |
| 2004 | 6.1 C | -0.12 C |
| 2005 | 6.5 C | +0.29 C |
| 2006 | 6.6 C | +0.35 C |
| 2007 | 7.2 C | +0.97 C |
| 2008 | 5.5 C | -0.75 C |
| 2009 | 6.0 C | -0.28 C |
| 2010 | 6.2 C | -0.03 C |
| 2011 | 6.1 C | -0.15 C |
| 2012 | 8.4 C | +2.19 C |
| 2013 | 6.7 C | +0.43 C |
| 2014 | 7.4 C | +1.17 C |
| 2015 | 7.7 C | +1.47 C |
| 2016 | 7.1 C | +0.85 C |
| 2017 | 7.2 C | +0.96 C |
| 2018 | 7.2 C | +0.92 C |
| 2019 | 5.0 C | -1.22 C |
| 2020 | 6.7 C | +0.44 C |
| 2021 | 7.5 C | +1.24 C |
| 2022 | 6.5 C | +0.28 C |
| 2023 | 5.9 C | -0.34 C |
| 2024 | 7.7 C | +1.40 C |
| 2025 | 8.6 C | +2.32 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1948 to 2025. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.2 to 0.4) per decade | 1948 to 2025 | 75 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.1 to 0.5) per decade | 1948 to 2025 | 75 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1948 to 2025 | 75 | 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
1948 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.7 C (98.1 F) | 2002 | 33.3 C (91.9 F) | 79 |
| Coldest night (TNn) | -38.3 C (-36.9 F) | 1963 | -26.6 C (-15.9 F) | 79 |
| Wettest day (Rx1day) | 50.8 mm (2.0 in) | 1973 | 18.8 mm (0.7 in) | 79 |
| Wettest five days (Rx5day) | 71.1 mm (2.8 in) | 1969 | 26.9 mm (1.1 in) | 79 |
| Longest dry spell (CDD) | 90 days | 2012 | 39 days | 79 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | 32.8 C (91.0 F) |
| 1949 | 33.3 C (91.9 F) |
| 1950 | 31.7 C (89.1 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 33.3 C (91.9 F) |
| 1953 | 33.3 C (91.9 F) |
| 1954 | 35.6 C (96.1 F) |
| 1955 | 33.3 C (91.9 F) |
| 1956 | 32.2 C (90.0 F) |
| 1957 | 31.7 C (89.1 F) |
| 1958 | 33.3 C (91.9 F) |
| 1959 | 32.8 C (91.0 F) |
| 1960 | 33.3 C (91.9 F) |
| 1961 | 32.2 C (90.0 F) |
| 1962 | 31.1 C (88.0 F) |
| 1963 | 31.1 C (88.0 F) |
| 1964 | 32.2 C (90.0 F) |
| 1965 | 31.1 C (88.0 F) |
| 1966 | 35.0 C (95.0 F) |
| 1967 | 32.8 C (91.0 F) |
| 1968 | 32.2 C (90.0 F) |
| 1969 | 35.0 C (95.0 F) |
| 1970 | 33.3 C (91.9 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 33.9 C (93.0 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 32.8 C (91.0 F) |
| 1975 | 33.9 C (93.0 F) |
| 1976 | 35.0 C (95.0 F) |
| 1977 | 33.3 C (91.9 F) |
| 1978 | 32.8 C (91.0 F) |
| 1979 | 33.3 C (91.9 F) |
| 1980 | 32.2 C (90.0 F) |
| 1981 | 31.7 C (89.1 F) |
| 1982 | 23.9 C (75.0 F) |
| 1983 | 29.4 C (84.9 F) |
| 1984 | 32.2 C (90.0 F) |
| 1985 | 33.3 C (91.9 F) |
| 1986 | 32.2 C (90.0 F) |
| 1987 | 32.8 C (91.0 F) |
| 1988 | 35.0 C (95.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 34.4 C (93.9 F) |
| 1991 | 33.3 C (91.9 F) |
| 1992 | 31.1 C (88.0 F) |
| 1993 | 30.0 C (86.0 F) |
| 1994 | 33.9 C (93.0 F) |
| 1995 | 33.3 C (91.9 F) |
| 1996 | 33.3 C (91.9 F) |
| 1997 | 32.8 C (91.0 F) |
| 1998 | 34.4 C (93.9 F) |
| 1999 | 31.1 C (88.0 F) |
| 2000 | 33.9 C (93.0 F) |
| 2001 | 35.6 C (96.1 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 35.6 C (96.1 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 35.6 C (96.1 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 35.6 C (96.1 F) |
| 2008 | 34.4 C (93.9 F) |
| 2009 | 33.9 C (93.0 F) |
| 2010 | 33.9 C (93.0 F) |
| 2011 | 33.3 C (91.9 F) |
| 2012 | 35.0 C (95.0 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 34.4 C (93.9 F) |
| 2015 | 32.8 C (91.0 F) |
| 2016 | 33.9 C (93.0 F) |
| 2017 | 34.4 C (93.9 F) |
| 2018 | 35.0 C (95.0 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 35.6 C (96.1 F) |
| 2022 | 34.4 C (93.9 F) |
| 2023 | 36.1 C (97.0 F) |
| 2024 | 35.6 C (96.1 F) |
| 2025 | 35.0 C (95.0 F) |
| 2026 | 36.7 C (98.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | -26.1 C (-15.0 F) |
| 1949 | -30.6 C (-23.1 F) |
| 1950 | -23.9 C (-11.0 F) |
| 1951 | -27.8 C (-18.0 F) |
| 1952 | -27.2 C (-17.0 F) |
| 1953 | -20.0 C (-4.0 F) |
| 1954 | -19.4 C (-2.9 F) |
| 1955 | -24.4 C (-11.9 F) |
| 1956 | -27.2 C (-17.0 F) |
| 1957 | -25.6 C (-14.1 F) |
| 1958 | -22.8 C (-9.0 F) |
| 1959 | -27.2 C (-17.0 F) |
| 1960 | -31.1 C (-24.0 F) |
| 1961 | -28.3 C (-18.9 F) |
| 1962 | -31.7 C (-25.1 F) |
| 1963 | -38.3 C (-36.9 F) |
| 1964 | -26.7 C (-16.1 F) |
| 1965 | -23.9 C (-11.0 F) |
| 1966 | -20.6 C (-5.1 F) |
| 1967 | -23.3 C (-9.9 F) |
| 1968 | -23.3 C (-9.9 F) |
| 1969 | -24.4 C (-11.9 F) |
| 1970 | -28.9 C (-20.0 F) |
| 1971 | -27.8 C (-18.0 F) |
| 1972 | -33.3 C (-27.9 F) |
| 1973 | -31.1 C (-24.0 F) |
| 1974 | -32.2 C (-26.0 F) |
| 1975 | -27.8 C (-18.0 F) |
| 1976 | -25.0 C (-13.0 F) |
| 1977 | -24.4 C (-11.9 F) |
| 1978 | -33.9 C (-29.0 F) |
| 1979 | -32.2 C (-26.0 F) |
| 1980 | -26.7 C (-16.1 F) |
| 1981 | -25.0 C (-13.0 F) |
| 1982 | -30.0 C (-22.0 F) |
| 1983 | -28.3 C (-18.9 F) |
| 1984 | -28.3 C (-18.9 F) |
| 1985 | -31.7 C (-25.1 F) |
| 1986 | -19.4 C (-2.9 F) |
| 1987 | -27.2 C (-17.0 F) |
| 1988 | -20.0 C (-4.0 F) |
| 1989 | -33.9 C (-29.0 F) |
| 1990 | -33.9 C (-29.0 F) |
| 1991 | -25.6 C (-14.1 F) |
| 1992 | -25.6 C (-14.1 F) |
| 1993 | -25.0 C (-13.0 F) |
| 1994 | -23.9 C (-11.0 F) |
| 1995 | -23.3 C (-9.9 F) |
| 1996 | -28.3 C (-18.9 F) |
| 1997 | -25.6 C (-14.1 F) |
| 1998 | -27.2 C (-17.0 F) |
| 1999 | -17.8 C (0.0 F) |
| 2000 | -20.0 C (-4.0 F) |
| 2001 | -30.0 C (-22.0 F) |
| 2002 | -23.3 C (-9.9 F) |
| 2003 | -22.8 C (-9.0 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -28.9 C (-20.0 F) |
| 2006 | -28.9 C (-20.0 F) |
| 2007 | -27.2 C (-17.0 F) |
| 2008 | -26.7 C (-16.1 F) |
| 2009 | -24.4 C (-11.9 F) |
| 2010 | -25.0 C (-13.0 F) |
| 2011 | -29.4 C (-20.9 F) |
| 2012 | -23.3 C (-9.9 F) |
| 2013 | -28.2 C (-18.8 F) |
| 2014 | -29.3 C (-20.7 F) |
| 2015 | -26.6 C (-15.9 F) |
| 2016 | -28.8 C (-19.8 F) |
| 2017 | -31.0 C (-23.8 F) |
| 2018 | -23.2 C (-9.8 F) |
| 2019 | -23.8 C (-10.8 F) |
| 2020 | -23.2 C (-9.8 F) |
| 2021 | -23.2 C (-9.8 F) |
| 2022 | -22.7 C (-8.9 F) |
| 2023 | -28.3 C (-18.9 F) |
| 2024 | -25.5 C (-13.9 F) |
| 2025 | -23.8 C (-10.8 F) |
| 2026 | -18.3 C (-0.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 11.9 mm (0.5 in) |
| 1949 | 20.6 mm (0.8 in) |
| 1950 | 22.1 mm (0.9 in) |
| 1951 | 11.9 mm (0.5 in) |
| 1952 | 12.4 mm (0.5 in) |
| 1953 | 17.8 mm (0.7 in) |
| 1954 | 10.2 mm (0.4 in) |
| 1955 | 17.0 mm (0.7 in) |
| 1956 | 21.3 mm (0.8 in) |
| 1957 | 23.9 mm (0.9 in) |
| 1958 | 16.3 mm (0.6 in) |
| 1959 | 20.1 mm (0.8 in) |
| 1960 | 12.4 mm (0.5 in) |
| 1961 | 14.7 mm (0.6 in) |
| 1962 | 26.7 mm (1.1 in) |
| 1963 | 24.4 mm (1.0 in) |
| 1964 | 14.2 mm (0.6 in) |
| 1965 | 37.6 mm (1.5 in) |
| 1966 | 18.3 mm (0.7 in) |
| 1967 | 18.0 mm (0.7 in) |
| 1968 | 28.7 mm (1.1 in) |
| 1969 | 40.6 mm (1.6 in) |
| 1970 | 41.7 mm (1.6 in) |
| 1971 | 49.8 mm (2.0 in) |
| 1972 | 19.6 mm (0.8 in) |
| 1973 | 50.8 mm (2.0 in) |
| 1974 | 20.8 mm (0.8 in) |
| 1975 | 27.7 mm (1.1 in) |
| 1976 | 35.6 mm (1.4 in) |
| 1977 | 24.4 mm (1.0 in) |
| 1978 | 24.9 mm (1.0 in) |
| 1979 | 9.4 mm (0.37 in) |
| 1980 | 18.5 mm (0.7 in) |
| 1981 | 18.5 mm (0.7 in) |
| 1982 | 13.7 mm (0.5 in) |
| 1983 | 30.5 mm (1.2 in) |
| 1984 | 10.2 mm (0.4 in) |
| 1985 | 17.8 mm (0.7 in) |
| 1986 | 25.1 mm (1.0 in) |
| 1987 | 16.0 mm (0.6 in) |
| 1988 | 17.3 mm (0.7 in) |
| 1989 | 29.7 mm (1.2 in) |
| 1990 | 28.7 mm (1.1 in) |
| 1991 | 36.1 mm (1.4 in) |
| 1992 | 14.2 mm (0.6 in) |
| 1993 | 20.6 mm (0.8 in) |
| 1994 | 24.4 mm (1.0 in) |
| 1995 | 21.1 mm (0.8 in) |
| 1996 | 21.1 mm (0.8 in) |
| 1997 | 12.7 mm (0.5 in) |
| 1998 | 18.5 mm (0.7 in) |
| 1999 | 21.8 mm (0.9 in) |
| 2000 | 18.8 mm (0.7 in) |
| 2001 | 15.0 mm (0.6 in) |
| 2002 | 14.2 mm (0.6 in) |
| 2003 | 17.8 mm (0.7 in) |
| 2004 | 15.2 mm (0.6 in) |
| 2005 | 16.0 mm (0.6 in) |
| 2006 | 21.6 mm (0.9 in) |
| 2007 | 29.7 mm (1.2 in) |
| 2008 | 23.1 mm (0.9 in) |
| 2009 | 15.5 mm (0.6 in) |
| 2010 | 10.2 mm (0.4 in) |
| 2011 | 24.1 mm (0.9 in) |
| 2012 | 22.9 mm (0.9 in) |
| 2013 | 12.7 mm (0.5 in) |
| 2014 | 20.6 mm (0.8 in) |
| 2015 | 22.9 mm (0.9 in) |
| 2016 | 27.7 mm (1.1 in) |
| 2017 | 12.2 mm (0.5 in) |
| 2018 | 20.3 mm (0.8 in) |
| 2019 | 12.4 mm (0.5 in) |
| 2020 | 10.4 mm (0.4 in) |
| 2021 | 29.0 mm (1.1 in) |
| 2022 | 7.6 mm (0.30 in) |
| 2023 | 10.7 mm (0.4 in) |
| 2024 | 11.4 mm (0.4 in) |
| 2025 | 7.4 mm (0.29 in) |
| 2026 | 8.9 mm (0.35 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 19.0 mm (0.7 in) |
| 1949 | 46.8 mm (1.8 in) |
| 1950 | 31.7 mm (1.2 in) |
| 1951 | 15.1 mm (0.6 in) |
| 1952 | 26.2 mm (1.0 in) |
| 1953 | 21.9 mm (0.9 in) |
| 1954 | 17.3 mm (0.7 in) |
| 1955 | 17.5 mm (0.7 in) |
| 1956 | 33.5 mm (1.3 in) |
| 1957 | 33.5 mm (1.3 in) |
| 1958 | 19.1 mm (0.8 in) |
| 1959 | 34.4 mm (1.4 in) |
| 1960 | 18.6 mm (0.7 in) |
| 1961 | 24.9 mm (1.0 in) |
| 1962 | 28.0 mm (1.1 in) |
| 1963 | 44.5 mm (1.8 in) |
| 1964 | 26.7 mm (1.1 in) |
| 1965 | 68.5 mm (2.7 in) |
| 1966 | 23.3 mm (0.9 in) |
| 1967 | 29.2 mm (1.1 in) |
| 1968 | 33.8 mm (1.3 in) |
| 1969 | 71.1 mm (2.8 in) |
| 1970 | 62.0 mm (2.4 in) |
| 1971 | 57.9 mm (2.3 in) |
| 1972 | 37.0 mm (1.5 in) |
| 1973 | 54.9 mm (2.2 in) |
| 1974 | 38.1 mm (1.5 in) |
| 1975 | 32.0 mm (1.3 in) |
| 1976 | 59.0 mm (2.3 in) |
| 1977 | 26.9 mm (1.1 in) |
| 1978 | 32.7 mm (1.3 in) |
| 1979 | 18.8 mm (0.7 in) |
| 1980 | 32.8 mm (1.3 in) |
| 1981 | 32.1 mm (1.3 in) |
| 1982 | 16.2 mm (0.6 in) |
| 1983 | 33.8 mm (1.3 in) |
| 1984 | 13.5 mm (0.5 in) |
| 1985 | 33.5 mm (1.3 in) |
| 1986 | 25.6 mm (1.0 in) |
| 1987 | 21.8 mm (0.9 in) |
| 1988 | 20.1 mm (0.8 in) |
| 1989 | 30.0 mm (1.2 in) |
| 1990 | 32.5 mm (1.3 in) |
| 1991 | 37.4 mm (1.5 in) |
| 1992 | 21.4 mm (0.8 in) |
| 1993 | 26.4 mm (1.0 in) |
| 1994 | 45.7 mm (1.8 in) |
| 1995 | 37.2 mm (1.5 in) |
| 1996 | 26.9 mm (1.1 in) |
| 1997 | 21.5 mm (0.8 in) |
| 1998 | 21.6 mm (0.9 in) |
| 1999 | 49.6 mm (2.0 in) |
| 2000 | 41.4 mm (1.6 in) |
| 2001 | 25.7 mm (1.0 in) |
| 2002 | 22.8 mm (0.9 in) |
| 2003 | 51.3 mm (2.0 in) |
| 2004 | 36.0 mm (1.4 in) |
| 2005 | 26.0 mm (1.0 in) |
| 2006 | 22.4 mm (0.9 in) |
| 2007 | 34.8 mm (1.4 in) |
| 2008 | 23.9 mm (0.9 in) |
| 2009 | 20.5 mm (0.8 in) |
| 2010 | 23.9 mm (0.9 in) |
| 2011 | 37.1 mm (1.5 in) |
| 2012 | 32.8 mm (1.3 in) |
| 2013 | 17.2 mm (0.7 in) |
| 2014 | 29.2 mm (1.1 in) |
| 2015 | 47.5 mm (1.9 in) |
| 2016 | 49.3 mm (1.9 in) |
| 2017 | 24.3 mm (1.0 in) |
| 2018 | 24.8 mm (1.0 in) |
| 2019 | 14.5 mm (0.6 in) |
| 2020 | 19.8 mm (0.8 in) |
| 2021 | 29.5 mm (1.2 in) |
| 2022 | 12.3 mm (0.5 in) |
| 2023 | 16.5 mm (0.6 in) |
| 2024 | 16.2 mm (0.6 in) |
| 2025 | 15.1 mm (0.6 in) |
| 2026 | 17.3 mm (0.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 44 days |
| 1949 | 38 days |
| 1950 | 29 days |
| 1951 | 39 days |
| 1952 | 67 days |
| 1953 | 57 days |
| 1954 | 29 days |
| 1955 | 39 days |
| 1956 | 40 days |
| 1957 | 35 days |
| 1958 | 59 days |
| 1959 | 51 days |
| 1960 | 39 days |
| 1961 | 54 days |
| 1962 | 46 days |
| 1963 | 27 days |
| 1964 | 34 days |
| 1965 | 24 days |
| 1966 | 27 days |
| 1967 | 40 days |
| 1968 | 24 days |
| 1969 | 52 days |
| 1970 | 29 days |
| 1971 | 41 days |
| 1972 | 20 days |
| 1973 | 24 days |
| 1974 | 73 days |
| 1975 | 29 days |
| 1976 | 39 days |
| 1977 | 56 days |
| 1978 | 55 days |
| 1979 | 30 days |
| 1980 | 43 days |
| 1981 | 26 days |
| 1982 | 13 days |
| 1983 | 9 days |
| 1984 | 25 days |
| 1985 | 25 days |
| 1986 | 40 days |
| 1987 | 38 days |
| 1988 | 57 days |
| 1989 | 49 days |
| 1990 | 33 days |
| 1991 | 39 days |
| 1992 | 29 days |
| 1993 | 34 days |
| 1994 | 30 days |
| 1995 | 33 days |
| 1996 | 29 days |
| 1997 | 33 days |
| 1998 | 35 days |
| 1999 | 39 days |
| 2000 | 45 days |
| 2001 | 28 days |
| 2002 | 43 days |
| 2003 | 44 days |
| 2004 | 49 days |
| 2005 | 35 days |
| 2006 | 37 days |
| 2007 | 31 days |
| 2008 | 56 days |
| 2009 | 31 days |
| 2010 | 35 days |
| 2011 | 37 days |
| 2012 | 90 days |
| 2013 | 42 days |
| 2014 | 32 days |
| 2015 | 34 days |
| 2016 | 48 days |
| 2017 | 67 days |
| 2018 | 43 days |
| 2019 | 53 days |
| 2020 | 60 days |
| 2021 | 50 days |
| 2022 | 63 days |
| 2023 | 51 days |
| 2024 | 32 days |
| 2025 | 46 days |
| 2026 | 41 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
75 years with a frostAcross 75 years with a frost, the median last spring frost at Rock Springs AP falls on 29 May and the median first autumn frost on 21 September, which leaves a median of 115 days between them.
In 1996 to 2025 the median growing season was 123 days. That is 9 days more than in 1948 to 1977.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
| Measure | Median, all years | Earliest period (1948 to 1977) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 29 May | 27 May | 28 May | 1 day later | -0.4 days per decade |
| First autumn frost | 21 September | 16 September | 26 September | 10 days later | +1.5 days per decade |
| Growing days | 115 days | 114 days | 123 days | 9 days more | +1.9 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
76 years, 1948 to 2025A day with at least 18.9 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 51.0 mm (2.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 18.9 mm (0.7 in) | |
| 5 years | 26.7 mm (1.1 in) | |
| 10 years | 32.1 mm (1.3 in) | |
| 25 years | 39.4 mm (1.6 in) | |
| 50 years | 45.1 mm (1.8 in) | |
| 100 years | 51.0 mm (2.0 in) | Longer than the 76 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, 76 years of values from 1948 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: 50.8 mm (2.0 in) in 1973; 49.8 mm (2.0 in) in 1971; 41.7 mm (1.6 in) in 1970.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Rock Springs AP had a mean temperature of 7.1 C (44.7 F) and 132.6 mm (5.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Pathfinder Dam (United States, 206 km away), Dead Horse Creek (United States, 386 km away) and Bates Creek #2 (United States, 250 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Pathfinder Dam | United States | 206 km (128 mi) | 7.2 C (44.9 F) | 237.2 mm (9.3 in) | 0.76 |
| Dead Horse Creek | United States | 386 km (240 mi) | 7.1 C (44.7 F) | 277.2 mm (10.9 in) | 0.82 |
| Bates Creek #2 | United States | 250 km (155 mi) | 7.2 C (44.9 F) | 315.9 mm (12.4 in) | 0.95 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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).