Sun Rvr 4 S Weather Records (USC00248021)
Record envelope, standing records and threshold days for Sun Rvr 4 S (USC00248021), Montana, United States, with 115 years of record.
Key Facts for Sun Rvr 4 S
- Sun Rvr 4 S (USC00248021) is a weather station in Montana, United States at 47.48 latitude and -111.74 longitude, 1,097 m (3,600 ft) above sea level.
- The station reports from 1912 to 2026, 115 years of record.
- 1,464 records set at Sun Rvr 4 S still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Sun Rvr 4 S set a monthly record daily precipitation of 41.1 mm (1.6 in) on 11 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Montana, United States, 47.48 latitude, -111.74 longitude.
- Elevation: 1,097 m (3,600 ft).
- Period of record: 1912 to 2026, 115 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
10 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 18.9 C (66.0 F) | -43.3 C (-45.9 F) | 18.3 C (64.9 F) | -19.4 C (-2.9 F) |
| Feb | 22.8 C (73.0 F) | -42.8 C (-45.0 F) | 19.4 C (66.9 F) | -30.0 C (-22.0 F) |
| Mar | 25.6 C (78.1 F) | -40.6 C (-41.1 F) | 22.8 C (73.0 F) | -23.3 C (-9.9 F) |
| Apr | 31.1 C (88.0 F) | -26.7 C (-16.1 F) | 26.7 C (80.1 F) | -10.0 C (14.0 F) |
| May | 33.9 C (93.0 F) | -13.3 C (8.1 F) | 31.7 C (89.1 F) | -8.3 C (17.1 F) |
| Jun | 37.2 C (99.0 F) | -3.3 C (26.1 F) | 28.9 C (84.0 F) | 2.2 C (36.0 F) |
| Jul | 43.9 C (111.0 F) | 0.6 C (33.1 F) | 37.2 C (99.0 F) | 6.7 C (44.1 F) |
| Aug | 38.9 C (102.0 F) | -2.2 C (28.0 F) | 36.7 C (98.1 F) | 1.7 C (35.1 F) |
| Sep | 36.7 C (98.1 F) | -8.9 C (16.0 F) | 30.0 C (86.0 F) | -2.8 C (27.0 F) |
| Oct | 32.8 C (91.0 F) | -28.3 C (-18.9 F) | 28.3 C (82.9 F) | -1.1 C (30.0 F) |
| Nov | 23.3 C (73.9 F) | -40.0 C (-40.0 F) | n/a | n/a |
| Dec | 20.6 C (69.1 F) | -46.1 C (-51.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1942 | 1 |
| 1943 | 13 |
| 1946 | 1 |
| 1947 | 1 |
| 1953 | 12 |
| 1954 | 37 |
| 1955 | 20 |
| 1956 | 24 |
| 1957 | 23 |
| 1958 | 18 |
| 1959 | 18 |
| 1960 | 26 |
| 1961 | 23 |
| 1962 | 20 |
| 1963 | 25 |
| 1964 | 20 |
| 1965 | 30 |
| 1966 | 26 |
| 1967 | 27 |
| 1968 | 22 |
| 1969 | 31 |
| 1970 | 17 |
| 1971 | 17 |
| 1972 | 21 |
| 1973 | 15 |
| 1974 | 16 |
| 1975 | 11 |
| 1976 | 11 |
| 1977 | 20 |
| 1978 | 17 |
| 1979 | 7 |
| 1980 | 25 |
| 1981 | 16 |
| 1982 | 14 |
| 1983 | 21 |
| 1984 | 27 |
| 1985 | 37 |
| 1986 | 17 |
| 1987 | 36 |
| 1988 | 24 |
| 1989 | 16 |
| 1990 | 26 |
| 1991 | 17 |
| 1992 | 33 |
| 1993 | 20 |
| 1994 | 20 |
| 1995 | 18 |
| 1996 | 36 |
| 1997 | 18 |
| 1998 | 10 |
| 1999 | 14 |
| 2000 | 17 |
| 2001 | 16 |
| 2002 | 34 |
| 2003 | 18 |
| 2004 | 10 |
| 2005 | 23 |
| 2006 | 17 |
| 2007 | 16 |
| 2008 | 19 |
| 2009 | 25 |
| 2010 | 17 |
| 2011 | 10 |
| 2012 | 12 |
| 2013 | 12 |
| 2014 | 18 |
| 2015 | 20 |
| 2016 | 5 |
| 2017 | 11 |
| 2018 | 15 |
| 2019 | 26 |
| 2020 | 20 |
| 2021 | 21 |
| 2022 | 16 |
| 2023 | 10 |
| 2024 | 14 |
| 2025 | 12 |
| 2026 | 15 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1983-05-09 | Record daily snowfall | Record daily snowfall 34.3 cm (13.5 in) |
| 1983-12-23 | Record low maximum temperature | Record low maximum temperature -32.8 C (-27.0 F) |
| 1983-12-24 | Record low maximum temperature | Record low maximum temperature -33.3 C (-27.9 F) |
| 2005-06-03 | Record daily precipitation | Record daily precipitation 72.6 mm (2.9 in) |
| 2006-06-10 | Record daily precipitation | Record daily precipitation 99.1 mm (3.9 in) |
| 2006-07-23 | Record high maximum temperature | Record high maximum temperature 43.9 C (111.0 F) |
| 2019-03-02 | Record snow depth | Record snow depth 50.8 cm (20.0 in) |
| 2019-03-03 | Record snow depth | Record snow depth 53.3 cm (21.0 in) |
| 2019-03-07 | Record snow depth | Record snow depth 55.9 cm (22.0 in) |
Wettest Day of Each Month
Jun: 99.1 mm (3.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 14.7 mm (0.6 in) | 11 January 1988 |
| Feb | 20.3 mm (0.8 in) | 23 February 2023 |
| Mar | 24.1 mm (0.9 in) | 18 March 2007 |
| Apr | 50.0 mm (2.0 in) | 6 April 2006 |
| May | 55.9 mm (2.2 in) | 9 May 1983 |
| Jun | 99.1 mm (3.9 in) | 10 June 2006 |
| Jul | 38.9 mm (1.5 in) | 10 July 1983 |
| Aug | 52.1 mm (2.1 in) | 25 August 1989 |
| Sep | 39.4 mm (1.6 in) | 27 September 1982 |
| Oct | 32.0 mm (1.3 in) | 13 October 1975 |
| Nov | 17.3 mm (0.7 in) | 11 November 2012 |
| Dec | 14.0 mm (0.6 in) | 4 December 2005 |
Period of Record Coverage
1943 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1943 | 5 | 1% | No |
| 1945 | 62 | 17% | No |
| 1946 | 1 | 0% | No |
| 1947 | 1 | 0% | No |
| 1953 | 282 | 77% | No |
| 1954 | 364 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 361 | 99% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 350 | 96% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 362 | 99% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 337 | 92% | Yes |
| 1971 | 310 | 85% | No |
| 1972 | 323 | 88% | No |
| 1973 | 344 | 94% | Yes |
| 1974 | 362 | 99% | Yes |
| 1975 | 361 | 99% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 356 | 98% | Yes |
| 1978 | 324 | 89% | No |
| 1979 | 254 | 70% | No |
| 1980 | 361 | 99% | Yes |
| 1981 | 357 | 98% | Yes |
| 1982 | 344 | 94% | Yes |
| 1983 | 359 | 98% | Yes |
| 1984 | 347 | 95% | Yes |
| 1985 | 340 | 93% | Yes |
| 1986 | 351 | 96% | Yes |
| 1987 | 351 | 96% | Yes |
| 1988 | 364 | 99% | Yes |
| 1989 | 360 | 99% | Yes |
| 1990 | 362 | 99% | Yes |
| 1991 | 359 | 98% | Yes |
| 1992 | 360 | 98% | Yes |
| 1993 | 361 | 99% | Yes |
| 1994 | 359 | 98% | Yes |
| 1995 | 360 | 99% | Yes |
| 1996 | 360 | 98% | Yes |
| 1997 | 356 | 98% | Yes |
| 1998 | 350 | 96% | Yes |
| 1999 | 354 | 97% | Yes |
| 2000 | 340 | 93% | Yes |
| 2001 | 356 | 98% | Yes |
| 2002 | 346 | 95% | Yes |
| 2003 | 360 | 99% | Yes |
| 2004 | 353 | 96% | Yes |
| 2005 | 347 | 95% | Yes |
| 2006 | 354 | 97% | Yes |
| 2007 | 319 | 87% | No |
| 2008 | 356 | 97% | Yes |
| 2009 | 346 | 95% | Yes |
| 2010 | 351 | 96% | Yes |
| 2011 | 295 | 81% | No |
| 2012 | 348 | 95% | Yes |
| 2013 | 355 | 97% | Yes |
| 2014 | 355 | 97% | Yes |
| 2015 | 242 | 66% | No |
| 2016 | 108 | 30% | No |
| 2017 | 356 | 98% | Yes |
| 2018 | 350 | 96% | Yes |
| 2019 | 348 | 95% | Yes |
| 2020 | 355 | 97% | Yes |
| 2021 | 341 | 93% | Yes |
| 2022 | 346 | 95% | Yes |
| 2023 | 344 | 94% | Yes |
| 2024 | 304 | 83% | No |
| 2025 | 268 | 73% | No |
| 2026 | 236 | 65% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 11 October 2026 | Sun Rvr 4 S, US | monthly rain (Provisional) | 41.1 mm (1.6 in) | 9.1 mm (0.36 in) | 50 years | 54 of 100 (Notable) |
| 11 October 2026 | Sun Rvr 4 S, US | daily snow depth (Provisional) | 15.2 cm (6.0 in) | 7.6 cm (3.0 in) | 56 years | 40 of 100 (Notable) |
| 11 October 2026 | Sun Rvr 4 S, US | monthly snowfall (Tie, Provisional) | 20.8 cm (8.2 in) | tie | 5 years | 5 of 100 (Routine) |
| 14 September 2026 | Sun Rvr 4 S, US | daily rain (Tie, Provisional) | 9.7 mm (0.38 in) | tie | 52 years | 6 of 100 (Routine) |
| 7 September 2026 | Sun Rvr 4 S, US | daily rain (Provisional) | 17.3 mm (0.7 in) | 1.3 mm (0.05 in) | 24 years | 19 of 100 (Routine) |
| 5 August 2026 | Sun Rvr 4 S, US | daily low min | 3.3 C (37.9 F) | 1.1 C (2.0 F) | 68 years | 31 of 100 (Routine) |
| 4 August 2026 | Sun Rvr 4 S, US | daily low min | 1.7 C (35.1 F) | 1.6 C (2.9 F) | 44 years | 25 of 100 (Routine) |
| 3 August 2026 | Sun Rvr 4 S, US | daily high max (Tie) | 36.7 C (98.1 F) | tie | 64 years | 6 of 100 (Routine) |
| 26 July 2026 | Sun Rvr 4 S, US | daily high max | 37.2 C (99.0 F) | 0.5 C (0.9 F) | 41 years | 21 of 100 (Routine) |
| 29 June 2026 | Sun Rvr 4 S, US | daily rain | 43.2 mm (1.7 in) | 11.7 mm (0.5 in) | 5 years | 22 of 100 (Routine) |
| 2 June 2026 | Sun Rvr 4 S, US | daily low max (Tie) | 10.6 C (51.1 F) | tie | 20 years | 3 of 100 (Routine) |
| 27 May 2026 | Sun Rvr 4 S, US | daily high min (Tie) | 12.2 C (54.0 F) | tie | 32 years | 4 of 100 (Routine) |
| 18 May 2026 | Sun Rvr 4 S, US | daily low max | 6.1 C (43.0 F) | 0.6 C (1.1 F) | 28 years | 16 of 100 (Routine) |
| 6 May 2026 | Sun Rvr 4 S, US | daily low min | -8.3 C (17.1 F) | 0.5 C (0.9 F) | 29 years | 17 of 100 (Routine) |
| 3 April 2026 | Sun Rvr 4 S, US | daily rain | 29.0 mm (1.1 in) | 19.1 mm (0.8 in) | 60 years | 60 of 100 (Major) |
| 3 April 2026 | Sun Rvr 4 S, US | daily snowfall | 13.0 cm (5.1 in) | 2.8 cm (1.1 in) | 76 years | 37 of 100 (Notable) |
| 25 March 2026 | Sun Rvr 4 S, US | daily high min | 7.2 C (45.0 F) | 0.5 C (0.9 F) | 65 years | 27 of 100 (Routine) |
| 20 March 2026 | Sun Rvr 4 S, US | daily high min | 10.0 C (50.0 F) | 3.3 C (5.9 F) | 37 years | 23 of 100 (Routine) |
| 20 March 2026 | Sun Rvr 4 S, US | daily high max (Tie) | 22.8 C (73.0 F) | tie | 65 years | 6 of 100 (Routine) |
| 19 March 2026 | Sun Rvr 4 S, US | monthly high min | 11.7 C (53.1 F) | 1.1 C (2.0 F) | 39 years | 30 of 100 (Routine) |
Climate Trend
58 complete years, 1954 to 2023| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1954 | 6.9 C | -0.02 C |
| 1955 | 5.1 C | -1.84 C |
| 1956 | 7.0 C | +0.04 C |
| 1957 | 6.2 C | -0.70 C |
| 1958 | 7.7 C | +0.72 C |
| 1960 | 6.8 C | -0.12 C |
| 1961 | 8.0 C | +1.02 C |
| 1962 | 7.1 C | +0.18 C |
| 1963 | 7.8 C | +0.88 C |
| 1964 | 6.6 C | -0.34 C |
| 1965 | 6.0 C | -0.97 C |
| 1966 | 7.1 C | +0.15 C |
| 1967 | 7.1 C | +0.14 C |
| 1968 | 6.8 C | -0.12 C |
| 1969 | 5.7 C | -1.21 C |
| 1974 | 7.9 C | +0.92 C |
| 1975 | 5.6 C | -1.31 C |
| 1976 | 8.1 C | +1.11 C |
| 1977 | 7.2 C | +0.23 C |
| 1980 | 7.0 C | +0.02 C |
| 1981 | 7.9 C | +0.92 C |
| 1982 | 5.4 C | -1.57 C |
| 1983 | 6.9 C | -0.08 C |
| 1984 | 6.4 C | -0.53 C |
| 1985 | 5.7 C | -1.29 C |
| 1986 | 7.4 C | +0.48 C |
| 1987 | 8.4 C | +1.49 C |
| 1988 | 8.5 C | +1.54 C |
| 1989 | 6.3 C | -0.65 C |
| 1990 | 7.6 C | +0.70 C |
| 1991 | 7.7 C | +0.77 C |
| 1992 | 7.8 C | +0.89 C |
| 1993 | 5.6 C | -1.37 C |
| 1994 | 7.3 C | +0.38 C |
| 1995 | 6.6 C | -0.34 C |
| 1996 | 4.9 C | -2.07 C |
| 1997 | 7.3 C | +0.35 C |
| 1998 | 7.7 C | +0.80 C |
| 1999 | 8.2 C | +1.25 C |
| 2001 | 7.9 C | +0.98 C |
| 2002 | 6.4 C | -0.56 C |
| 2003 | 7.9 C | +1.00 C |
| 2004 | 7.8 C | +0.81 C |
| 2005 | 7.4 C | +0.46 C |
| 2006 | 8.3 C | +1.35 C |
| 2008 | 6.8 C | -0.10 C |
| 2009 | 6.5 C | -0.40 C |
| 2010 | 6.7 C | -0.24 C |
| 2012 | 8.4 C | +1.47 C |
| 2013 | 7.6 C | +0.68 C |
| 2014 | 6.8 C | -0.12 C |
| 2017 | 6.3 C | -0.62 C |
| 2018 | 5.6 C | -1.32 C |
| 2019 | 4.3 C | -2.66 C |
| 2020 | 6.7 C | -0.26 C |
| 2021 | 6.6 C | -0.36 C |
| 2022 | 6.0 C | -0.90 C |
| 2023 | 7.4 C | +0.49 C |
The fitted trend in annual mean temperature here over 1954 to 2023 is -0.01 C (-0.13 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.01 F (-0.24 to 0.21) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.01 C (-0.13 to 0.12) per decade | -0.01 F (-0.24 to 0.21) per decade | 1954 to 2023 | 58 | Not clearly different from zero |
| Mean daily maximum | 0.00 C (-0.15 to 0.14) per decade | -0.01 F (-0.27 to 0.26) per decade | 1954 to 2023 | 58 | Not clearly different from zero |
| Mean daily minimum | -0.01 C (-0.12 to 0.11) per decade | -0.01 F (-0.22 to 0.19) per decade | 1954 to 2023 | 58 | 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
1912 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 43.9 C (111.0 F) | 2006 | 36.1 C (97.0 F) | 78 |
| Coldest night (TNn) | -46.1 C (-51.0 F) | 1968 | -36.1 C (-33.0 F) | 80 |
| Wettest day (Rx1day) | 99.1 mm (3.9 in) | 2006 | 27.9 mm (1.1 in) | 87 |
| Wettest five days (Rx5day) | 125.0 mm (4.9 in) | 2006 | 46.3 mm (1.8 in) | 85 |
| Longest dry spell (CDD) | 87 days | 1969 | 34 days | 86 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1912 | n/a |
| 1941 | n/a |
| 1942 | n/a |
| 1943 | -18.9 C (-2.0 F) |
| 1944 | n/a |
| 1945 | 24.4 C (75.9 F) |
| 1946 | 15.6 C (60.1 F) |
| 1947 | 14.4 C (57.9 F) |
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1952 | n/a |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 36.1 C (97.0 F) |
| 1955 | 34.4 C (93.9 F) |
| 1956 | 34.4 C (93.9 F) |
| 1957 | 34.4 C (93.9 F) |
| 1958 | 33.9 C (93.0 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 37.8 C (100.0 F) |
| 1961 | 38.9 C (102.0 F) |
| 1962 | 33.9 C (93.0 F) |
| 1963 | 35.6 C (96.1 F) |
| 1964 | 36.1 C (97.0 F) |
| 1965 | 34.4 C (93.9 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 36.1 C (97.0 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 38.9 C (102.0 F) |
| 1970 | 36.1 C (97.0 F) |
| 1971 | 37.2 C (99.0 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 38.3 C (100.9 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 36.7 C (98.1 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 32.8 C (91.0 F) |
| 1978 | 33.9 C (93.0 F) |
| 1979 | 35.6 C (96.1 F) |
| 1980 | 35.6 C (96.1 F) |
| 1981 | 37.8 C (100.0 F) |
| 1982 | 34.4 C (93.9 F) |
| 1983 | 38.9 C (102.0 F) |
| 1984 | 37.8 C (100.0 F) |
| 1985 | 36.7 C (98.1 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 34.4 C (93.9 F) |
| 1988 | 36.1 C (97.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 35.6 C (96.1 F) |
| 1993 | 33.3 C (91.9 F) |
| 1994 | 35.6 C (96.1 F) |
| 1995 | 34.4 C (93.9 F) |
| 1996 | 37.2 C (99.0 F) |
| 1997 | 34.4 C (93.9 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 35.0 C (95.0 F) |
| 2000 | 37.8 C (100.0 F) |
| 2001 | 36.7 C (98.1 F) |
| 2002 | 38.3 C (100.9 F) |
| 2003 | 37.2 C (99.0 F) |
| 2004 | 36.1 C (97.0 F) |
| 2005 | 36.1 C (97.0 F) |
| 2006 | 43.9 C (111.0 F) |
| 2007 | 39.4 C (102.9 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 36.7 C (98.1 F) |
| 2011 | 37.8 C (100.0 F) |
| 2012 | 37.8 C (100.0 F) |
| 2013 | 36.1 C (97.0 F) |
| 2014 | 33.3 C (91.9 F) |
| 2015 | 36.1 C (97.0 F) |
| 2016 | 28.3 C (82.9 F) |
| 2017 | 37.2 C (99.0 F) |
| 2018 | 38.3 C (100.9 F) |
| 2019 | 34.4 C (93.9 F) |
| 2020 | 35.6 C (96.1 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 36.7 C (98.1 F) |
| 2023 | 37.2 C (99.0 F) |
| 2024 | 37.2 C (99.0 F) |
| 2025 | 35.6 C (96.1 F) |
| 2026 | 37.2 C (99.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1912 | n/a |
| 1941 | n/a |
| 1942 | -30.6 C (-23.1 F) |
| 1943 | -39.4 C (-38.9 F) |
| 1944 | -28.3 C (-18.9 F) |
| 1945 | -31.1 C (-24.0 F) |
| 1946 | -31.7 C (-25.1 F) |
| 1947 | -32.2 C (-26.0 F) |
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1952 | n/a |
| 1953 | -18.3 C (-0.9 F) |
| 1954 | -43.3 C (-45.9 F) |
| 1955 | -34.4 C (-29.9 F) |
| 1956 | -35.0 C (-31.0 F) |
| 1957 | -42.8 C (-45.0 F) |
| 1958 | -28.9 C (-20.0 F) |
| 1959 | -40.0 C (-40.0 F) |
| 1960 | -36.1 C (-33.0 F) |
| 1961 | -34.4 C (-29.9 F) |
| 1962 | -36.7 C (-34.1 F) |
| 1963 | -38.3 C (-36.9 F) |
| 1964 | -40.6 C (-41.1 F) |
| 1965 | -33.3 C (-27.9 F) |
| 1966 | -33.3 C (-27.9 F) |
| 1967 | -36.7 C (-34.1 F) |
| 1968 | -46.1 C (-51.0 F) |
| 1969 | -42.8 C (-45.0 F) |
| 1970 | -32.8 C (-27.0 F) |
| 1971 | -38.3 C (-36.9 F) |
| 1972 | -41.7 C (-43.1 F) |
| 1973 | -30.0 C (-22.0 F) |
| 1974 | -36.1 C (-33.0 F) |
| 1975 | -35.6 C (-32.1 F) |
| 1976 | -31.7 C (-25.1 F) |
| 1977 | -36.7 C (-34.1 F) |
| 1978 | -33.9 C (-29.0 F) |
| 1979 | -38.9 C (-38.0 F) |
| 1980 | -36.7 C (-34.1 F) |
| 1981 | -37.8 C (-36.0 F) |
| 1982 | -36.7 C (-34.1 F) |
| 1983 | -44.4 C (-47.9 F) |
| 1984 | -36.1 C (-33.0 F) |
| 1985 | -37.8 C (-36.0 F) |
| 1986 | -34.4 C (-29.9 F) |
| 1987 | -30.6 C (-23.1 F) |
| 1988 | -31.1 C (-24.0 F) |
| 1989 | -39.4 C (-38.9 F) |
| 1990 | -40.6 C (-41.1 F) |
| 1991 | -31.1 C (-24.0 F) |
| 1992 | -33.3 C (-27.9 F) |
| 1993 | -33.9 C (-29.0 F) |
| 1994 | -42.2 C (-44.0 F) |
| 1995 | -30.6 C (-23.1 F) |
| 1996 | -43.3 C (-45.9 F) |
| 1997 | -37.8 C (-36.0 F) |
| 1998 | -40.0 C (-40.0 F) |
| 1999 | -29.4 C (-20.9 F) |
| 2000 | -31.1 C (-24.0 F) |
| 2001 | -27.8 C (-18.0 F) |
| 2002 | -38.3 C (-36.9 F) |
| 2003 | -30.6 C (-23.1 F) |
| 2004 | -37.8 C (-36.0 F) |
| 2005 | -41.1 C (-42.0 F) |
| 2006 | -35.0 C (-31.0 F) |
| 2007 | -29.4 C (-20.9 F) |
| 2008 | -39.4 C (-38.9 F) |
| 2009 | -37.8 C (-36.0 F) |
| 2010 | -35.0 C (-31.0 F) |
| 2011 | -36.1 C (-33.0 F) |
| 2012 | -30.0 C (-22.0 F) |
| 2013 | -37.2 C (-35.0 F) |
| 2014 | -40.6 C (-41.1 F) |
| 2015 | -32.8 C (-27.0 F) |
| 2016 | -38.3 C (-36.9 F) |
| 2017 | -32.8 C (-27.0 F) |
| 2018 | -33.3 C (-27.9 F) |
| 2019 | -40.6 C (-41.1 F) |
| 2020 | -28.9 C (-20.0 F) |
| 2021 | -35.0 C (-31.0 F) |
| 2022 | -39.4 C (-38.9 F) |
| 2023 | -30.6 C (-23.1 F) |
| 2024 | -40.0 C (-40.0 F) |
| 2025 | -37.8 C (-36.0 F) |
| 2026 | -30.0 C (-22.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1912 | 13.5 mm (0.5 in) |
| 1941 | 8.1 mm (0.32 in) |
| 1942 | 12.7 mm (0.5 in) |
| 1943 | 32.3 mm (1.3 in) |
| 1944 | 25.4 mm (1.0 in) |
| 1945 | 17.3 mm (0.7 in) |
| 1946 | 41.9 mm (1.6 in) |
| 1947 | 63.2 mm (2.5 in) |
| 1948 | 26.7 mm (1.1 in) |
| 1949 | 17.3 mm (0.7 in) |
| 1950 | 38.4 mm (1.5 in) |
| 1951 | 33.8 mm (1.3 in) |
| 1952 | 19.6 mm (0.8 in) |
| 1953 | 42.9 mm (1.7 in) |
| 1954 | 42.7 mm (1.7 in) |
| 1955 | 25.4 mm (1.0 in) |
| 1956 | 19.6 mm (0.8 in) |
| 1957 | 43.9 mm (1.7 in) |
| 1958 | 33.8 mm (1.3 in) |
| 1959 | 23.6 mm (0.9 in) |
| 1960 | 21.1 mm (0.8 in) |
| 1961 | 17.8 mm (0.7 in) |
| 1962 | 30.7 mm (1.2 in) |
| 1963 | 22.4 mm (0.9 in) |
| 1964 | 64.3 mm (2.5 in) |
| 1965 | 55.4 mm (2.2 in) |
| 1966 | 18.5 mm (0.7 in) |
| 1967 | 34.8 mm (1.4 in) |
| 1968 | 35.1 mm (1.4 in) |
| 1969 | 48.3 mm (1.9 in) |
| 1970 | 23.6 mm (0.9 in) |
| 1971 | 21.3 mm (0.8 in) |
| 1972 | 28.7 mm (1.1 in) |
| 1973 | 17.8 mm (0.7 in) |
| 1974 | 25.9 mm (1.0 in) |
| 1975 | 48.3 mm (1.9 in) |
| 1976 | 17.5 mm (0.7 in) |
| 1977 | 24.4 mm (1.0 in) |
| 1978 | 25.4 mm (1.0 in) |
| 1979 | 24.9 mm (1.0 in) |
| 1980 | 54.6 mm (2.1 in) |
| 1981 | 26.7 mm (1.1 in) |
| 1982 | 39.4 mm (1.6 in) |
| 1983 | 55.9 mm (2.2 in) |
| 1984 | 18.0 mm (0.7 in) |
| 1985 | 38.4 mm (1.5 in) |
| 1986 | 20.6 mm (0.8 in) |
| 1987 | 43.2 mm (1.7 in) |
| 1988 | 19.6 mm (0.8 in) |
| 1989 | 52.1 mm (2.1 in) |
| 1990 | 21.6 mm (0.9 in) |
| 1991 | 43.2 mm (1.7 in) |
| 1992 | 29.7 mm (1.2 in) |
| 1993 | 35.1 mm (1.4 in) |
| 1994 | 20.3 mm (0.8 in) |
| 1995 | 46.7 mm (1.8 in) |
| 1996 | 23.6 mm (0.9 in) |
| 1997 | 37.8 mm (1.5 in) |
| 1998 | 26.9 mm (1.1 in) |
| 1999 | 24.6 mm (1.0 in) |
| 2000 | 30.5 mm (1.2 in) |
| 2001 | 34.5 mm (1.4 in) |
| 2002 | 43.2 mm (1.7 in) |
| 2003 | 19.1 mm (0.8 in) |
| 2004 | 43.7 mm (1.7 in) |
| 2005 | 72.6 mm (2.9 in) |
| 2006 | 99.1 mm (3.9 in) |
| 2007 | 25.4 mm (1.0 in) |
| 2008 | 46.0 mm (1.8 in) |
| 2009 | 40.6 mm (1.6 in) |
| 2010 | 38.9 mm (1.5 in) |
| 2011 | 99.1 mm (3.9 in) |
| 2012 | 27.9 mm (1.1 in) |
| 2013 | 21.6 mm (0.9 in) |
| 2014 | 17.3 mm (0.7 in) |
| 2015 | 17.0 mm (0.7 in) |
| 2016 | 27.9 mm (1.1 in) |
| 2017 | 27.9 mm (1.1 in) |
| 2018 | 37.6 mm (1.5 in) |
| 2019 | 24.1 mm (0.9 in) |
| 2020 | 31.5 mm (1.2 in) |
| 2021 | 27.9 mm (1.1 in) |
| 2022 | 27.9 mm (1.1 in) |
| 2023 | 27.9 mm (1.1 in) |
| 2024 | 36.1 mm (1.4 in) |
| 2025 | 23.1 mm (0.9 in) |
| 2026 | 43.2 mm (1.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1912 | n/a |
| 1941 | 13.7 mm (0.5 in) |
| 1942 | 35.0 mm (1.4 in) |
| 1943 | 43.4 mm (1.7 in) |
| 1944 | 44.0 mm (1.7 in) |
| 1945 | 40.4 mm (1.6 in) |
| 1946 | 45.0 mm (1.8 in) |
| 1947 | 102.3 mm (4.0 in) |
| 1948 | 56.6 mm (2.2 in) |
| 1949 | 30.5 mm (1.2 in) |
| 1950 | 55.4 mm (2.2 in) |
| 1951 | 58.2 mm (2.3 in) |
| 1952 | 27.2 mm (1.1 in) |
| 1953 | 92.5 mm (3.6 in) |
| 1954 | 58.7 mm (2.3 in) |
| 1955 | 54.4 mm (2.1 in) |
| 1956 | 35.2 mm (1.4 in) |
| 1957 | 75.2 mm (3.0 in) |
| 1958 | 72.0 mm (2.8 in) |
| 1959 | 44.2 mm (1.7 in) |
| 1960 | 51.3 mm (2.0 in) |
| 1961 | 20.3 mm (0.8 in) |
| 1962 | 51.1 mm (2.0 in) |
| 1963 | 30.6 mm (1.2 in) |
| 1964 | 95.6 mm (3.8 in) |
| 1965 | 82.6 mm (3.3 in) |
| 1966 | 25.2 mm (1.0 in) |
| 1967 | 38.6 mm (1.5 in) |
| 1968 | 49.9 mm (2.0 in) |
| 1969 | 119.2 mm (4.7 in) |
| 1970 | 33.7 mm (1.3 in) |
| 1971 | 32.1 mm (1.3 in) |
| 1972 | 40.9 mm (1.6 in) |
| 1973 | 25.1 mm (1.0 in) |
| 1974 | 37.1 mm (1.5 in) |
| 1975 | 80.9 mm (3.2 in) |
| 1976 | 31.2 mm (1.2 in) |
| 1977 | 43.7 mm (1.7 in) |
| 1978 | 48.3 mm (1.9 in) |
| 1979 | 47.8 mm (1.9 in) |
| 1980 | 88.2 mm (3.5 in) |
| 1981 | 46.3 mm (1.8 in) |
| 1982 | 67.3 mm (2.6 in) |
| 1983 | 64.8 mm (2.6 in) |
| 1984 | 27.0 mm (1.1 in) |
| 1985 | 50.4 mm (2.0 in) |
| 1986 | 29.8 mm (1.2 in) |
| 1987 | 55.2 mm (2.2 in) |
| 1988 | 26.7 mm (1.1 in) |
| 1989 | 97.9 mm (3.9 in) |
| 1990 | 47.8 mm (1.9 in) |
| 1991 | 57.2 mm (2.3 in) |
| 1992 | 66.3 mm (2.6 in) |
| 1993 | 55.0 mm (2.2 in) |
| 1994 | 51.5 mm (2.0 in) |
| 1995 | 53.8 mm (2.1 in) |
| 1996 | 37.3 mm (1.5 in) |
| 1997 | 52.5 mm (2.1 in) |
| 1998 | 54.8 mm (2.2 in) |
| 1999 | 38.3 mm (1.5 in) |
| 2000 | 32.1 mm (1.3 in) |
| 2001 | 38.3 mm (1.5 in) |
| 2002 | 101.6 mm (4.0 in) |
| 2003 | 28.5 mm (1.1 in) |
| 2004 | 50.1 mm (2.0 in) |
| 2005 | 72.6 mm (2.9 in) |
| 2006 | 125.0 mm (4.9 in) |
| 2007 | 43.4 mm (1.7 in) |
| 2008 | 87.1 mm (3.4 in) |
| 2009 | 40.6 mm (1.6 in) |
| 2010 | 49.5 mm (1.9 in) |
| 2011 | n/a |
| 2012 | 30.0 mm (1.2 in) |
| 2013 | 17.5 mm (0.7 in) |
| 2014 | 36.3 mm (1.4 in) |
| 2015 | 17.0 mm (0.7 in) |
| 2016 | 25.9 mm (1.0 in) |
| 2017 | 60.4 mm (2.4 in) |
| 2018 | 76.3 mm (3.0 in) |
| 2019 | 37.5 mm (1.5 in) |
| 2020 | 45.2 mm (1.8 in) |
| 2021 | 59.3 mm (2.3 in) |
| 2022 | 44.7 mm (1.8 in) |
| 2023 | 45.3 mm (1.8 in) |
| 2024 | 43.2 mm (1.7 in) |
| 2025 | 25.7 mm (1.0 in) |
| 2026 | 67.1 mm (2.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1912 | n/a |
| 1941 | 14 days |
| 1942 | 37 days |
| 1943 | 35 days |
| 1944 | 34 days |
| 1945 | 27 days |
| 1946 | 26 days |
| 1947 | 19 days |
| 1948 | 30 days |
| 1949 | 47 days |
| 1950 | 37 days |
| 1951 | 25 days |
| 1952 | 33 days |
| 1953 | 48 days |
| 1954 | 68 days |
| 1955 | 77 days |
| 1956 | 37 days |
| 1957 | 45 days |
| 1958 | 20 days |
| 1959 | 43 days |
| 1960 | 70 days |
| 1961 | 28 days |
| 1962 | 35 days |
| 1963 | 58 days |
| 1964 | 59 days |
| 1965 | 53 days |
| 1966 | 26 days |
| 1967 | 36 days |
| 1968 | 42 days |
| 1969 | 87 days |
| 1970 | 22 days |
| 1971 | 34 days |
| 1972 | 28 days |
| 1973 | 29 days |
| 1974 | 39 days |
| 1975 | 34 days |
| 1976 | 60 days |
| 1977 | 56 days |
| 1978 | 34 days |
| 1979 | 39 days |
| 1980 | 27 days |
| 1981 | 34 days |
| 1982 | 23 days |
| 1983 | 23 days |
| 1984 | 29 days |
| 1985 | 30 days |
| 1986 | 28 days |
| 1987 | 35 days |
| 1988 | 36 days |
| 1989 | 17 days |
| 1990 | 27 days |
| 1991 | 30 days |
| 1992 | 34 days |
| 1993 | 22 days |
| 1994 | 31 days |
| 1995 | 39 days |
| 1996 | 28 days |
| 1997 | 39 days |
| 1998 | 34 days |
| 1999 | 49 days |
| 2000 | 32 days |
| 2001 | 36 days |
| 2002 | 27 days |
| 2003 | 34 days |
| 2004 | 63 days |
| 2005 | 58 days |
| 2006 | 29 days |
| 2007 | 41 days |
| 2008 | 35 days |
| 2009 | 46 days |
| 2010 | 46 days |
| 2011 | 3 days |
| 2012 | 33 days |
| 2013 | 34 days |
| 2014 | 22 days |
| 2015 | 14 days |
| 2016 | 18 days |
| 2017 | 30 days |
| 2018 | 30 days |
| 2019 | 16 days |
| 2020 | 38 days |
| 2021 | 43 days |
| 2022 | 28 days |
| 2023 | 22 days |
| 2024 | 29 days |
| 2025 | 23 days |
| 2026 | 18 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
58 years with a frostAcross 58 years with a frost, the median last spring frost at Sun Rvr 4 S falls on 25 May and the median first autumn frost on 14 September, which leaves a median of 112 days between them.
Fitted over all years, the growing season changes by +1.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1989 to 2023) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 25 May | n/a | 26 May | n/a | +0.2 days per decade |
| First autumn frost | 14 September | n/a | 18 September | n/a | +1.3 days per decade |
| Growing days | 112 days | n/a | 112 days | n/a | +1.1 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
71 years, 1942 to 2023A day with at least 30.2 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 88.8 mm (3.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 30.2 mm (1.2 in) | |
| 5 years | 43.1 mm (1.7 in) | |
| 10 years | 52.6 mm (2.1 in) | |
| 25 years | 66.0 mm (2.6 in) | |
| 50 years | 76.9 mm (3.0 in) | |
| 100 years | 88.8 mm (3.5 in) | Longer than the 71 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, 71 years of values from 1942 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: 99.1 mm (3.9 in) in 2006; 72.6 mm (2.9 in) in 2005; 64.3 mm (2.5 in) in 1964.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Sun Rvr 4 S, at 1981. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.2 C (0.3 F) lower than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1981 | -0.2 | -0.3 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2005 to 2023 against 1961 to 1990Over 2005 to 2023, Sun Rvr 4 S had a mean temperature of 6.8 C (44.2 F) and 351.8 mm (13.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Hiawatha (United States, 891 km away), Wanship Dam (United States, 744 km away) and Kamas (United States, 761 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Hiawatha | United States | 891 km (554 mi) | 6.9 C (44.5 F) | 384.2 mm (15.1 in) | 0.95 |
| Wanship Dam | United States | 744 km (462 mi) | 6.6 C (44.0 F) | 415.6 mm (16.4 in) | 0.99 |
| Kamas | United States | 761 km (473 mi) | 6.5 C (43.7 F) | 404.4 mm (15.9 in) | 1.01 |
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).