Bullfrog Basin Weather Records (USC00421020)
Record envelope, standing records and threshold days for Bullfrog Basin (USC00421020), Utah, United States, with 60 years of record.
Key Facts for Bullfrog Basin
- Bullfrog Basin (USC00421020) is a weather station in Utah, United States at 37.53 latitude and -110.72 longitude, 1,165 m (3,822 ft) above sea level.
- The station reports from 1967 to 2026, 60 years of record.
- 1,464 records set at Bullfrog Basin still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Bullfrog Basin tied a daily record low maximum temperature of 19.4 C (66.9 F) on 30 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Utah, United States, 37.53 latitude, -110.72 longitude.
- Elevation: 1,165 m (3,822 ft).
- Period of record: 1967 to 2026, 60 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
43 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 19.4 C (66.9 F) | -16.1 C (3.0 F) | 15.0 C (59.0 F) | -7.8 C (18.0 F) |
| Feb | 24.4 C (75.9 F) | -15.6 C (3.9 F) | 22.8 C (73.0 F) | -5.6 C (21.9 F) |
| Mar | 32.8 C (91.0 F) | -9.4 C (15.1 F) | 32.8 C (91.0 F) | -2.8 C (27.0 F) |
| Apr | 34.4 C (93.9 F) | -6.1 C (21.0 F) | 28.9 C (84.0 F) | -6.1 C (21.0 F) |
| May | 38.9 C (102.0 F) | 0.6 C (33.1 F) | 36.1 C (97.0 F) | 5.6 C (42.1 F) |
| Jun | 43.9 C (111.0 F) | 5.6 C (42.1 F) | 41.7 C (107.1 F) | 5.6 C (42.1 F) |
| Jul | 45.6 C (114.1 F) | 7.8 C (46.0 F) | 42.2 C (108.0 F) | 7.8 C (46.0 F) |
| Aug | 43.9 C (111.0 F) | 7.2 C (45.0 F) | 43.9 C (111.0 F) | 17.8 C (64.0 F) |
| Sep | 41.7 C (107.1 F) | 5.0 C (41.0 F) | 30.0 C (86.0 F) | 13.9 C (57.0 F) |
| Oct | 36.1 C (97.0 F) | -5.6 C (21.9 F) | n/a | n/a |
| Nov | 27.2 C (81.0 F) | -10.6 C (12.9 F) | n/a | n/a |
| Dec | 21.7 C (71.1 F) | -17.8 C (0.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1967 | 35 |
| 1968 | 29 |
| 1969 | 41 |
| 1970 | 29 |
| 1971 | 50 |
| 1972 | 44 |
| 1973 | 19 |
| 1974 | 17 |
| 1975 | 55 |
| 1976 | 17 |
| 1977 | 24 |
| 1978 | 30 |
| 1979 | 45 |
| 1980 | 28 |
| 1981 | 24 |
| 1982 | 19 |
| 1983 | 15 |
| 1984 | 33 |
| 1985 | 22 |
| 1986 | 25 |
| 1987 | 19 |
| 1988 | 21 |
| 1989 | 40 |
| 1990 | 26 |
| 1997 | 19 |
| 1998 | 10 |
| 1999 | 19 |
| 2000 | 36 |
| 2001 | 15 |
| 2002 | 15 |
| 2003 | 15 |
| 2004 | 16 |
| 2005 | 13 |
| 2006 | 26 |
| 2007 | 14 |
| 2008 | 14 |
| 2009 | 18 |
| 2010 | 23 |
| 2011 | 21 |
| 2012 | 21 |
| 2013 | 28 |
| 2014 | 23 |
| 2015 | 24 |
| 2016 | 27 |
| 2017 | 36 |
| 2018 | 21 |
| 2019 | 41 |
| 2020 | 43 |
| 2021 | 30 |
| 2022 | 41 |
| 2023 | 32 |
| 2024 | 30 |
| 2025 | 46 |
| 2026 | 40 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 2021-06-17 | Record high maximum temperature | Record high maximum temperature 43.9 C (111.0 F) |
| 2021-07-10 | Record high maximum temperature | Record high maximum temperature 45.0 C (113.0 F) |
| 2021-07-11 | Record high maximum temperature | Record high maximum temperature 45.6 C (114.1 F) |
| 2023-02-15 | Record daily snowfall | Record daily snowfall 25.4 cm (10.0 in) |
Wettest Day of Each Month
Jul: 44.2 mm (1.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 20.3 mm (0.8 in) | 22 January 2010 |
| Feb | 17.0 mm (0.7 in) | 23 February 2015 |
| Mar | 27.7 mm (1.1 in) | 16 March 2024 |
| Apr | 12.7 mm (0.5 in) | 9 April 2016 |
| May | 24.1 mm (0.9 in) | 8 May 1979 |
| Jun | 10.7 mm (0.4 in) | 23 June 1972 |
| Jul | 44.2 mm (1.7 in) | 19 July 1969 |
| Aug | 30.5 mm (1.2 in) | 18 August 1989 |
| Sep | 41.9 mm (1.6 in) | 8 September 2002 |
| Oct | 42.4 mm (1.7 in) | 6 October 2006 |
| Nov | 27.2 mm (1.1 in) | 23 November 2013 |
| Dec | 22.6 mm (0.9 in) | 8 December 2009 |
Period of Record Coverage
1967 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1967 | 305 | 84% | No |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 362 | 99% | Yes |
| 1975 | 360 | 99% | Yes |
| 1976 | 361 | 99% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 361 | 99% | Yes |
| 1979 | 357 | 98% | Yes |
| 1980 | 358 | 98% | Yes |
| 1981 | 363 | 99% | Yes |
| 1982 | 345 | 95% | Yes |
| 1983 | 349 | 96% | Yes |
| 1984 | 332 | 91% | Yes |
| 1985 | 327 | 90% | No |
| 1986 | 291 | 80% | No |
| 1987 | 320 | 88% | No |
| 1988 | 326 | 89% | No |
| 1989 | 299 | 82% | No |
| 1990 | 201 | 55% | No |
| 1997 | 292 | 80% | No |
| 1998 | 342 | 94% | Yes |
| 1999 | 359 | 98% | Yes |
| 2000 | 361 | 99% | Yes |
| 2001 | 341 | 93% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 298 | 82% | No |
| 2004 | 356 | 97% | Yes |
| 2005 | 327 | 90% | No |
| 2006 | 358 | 98% | Yes |
| 2007 | 349 | 96% | Yes |
| 2008 | 282 | 77% | No |
| 2009 | 296 | 81% | No |
| 2010 | 348 | 95% | Yes |
| 2011 | 353 | 97% | Yes |
| 2012 | 363 | 99% | Yes |
| 2013 | 361 | 99% | Yes |
| 2014 | 361 | 99% | Yes |
| 2015 | 364 | 100% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 356 | 98% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 349 | 96% | Yes |
| 2022 | 336 | 92% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 358 | 98% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 246 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 September 2026 | Bullfrog Basin, US | daily low max (Tie, Provisional) | 19.4 C (66.9 F) | tie | 21 years | 3 of 100 (Routine) |
| 28 September 2026 | Bullfrog Basin, US | daily high min (Provisional) | 21.1 C (70.0 F) | 3.9 C (7.0 F) | 40 years | 28 of 100 (Routine) |
| 31 August 2026 | Bullfrog Basin, US | daily rain (Provisional) | 4.1 mm (0.16 in) | 0.3 mm (0.01 in) | 27 years | 14 of 100 (Routine) |
| 30 August 2026 | Bullfrog Basin, US | daily rain (Provisional) | 5.1 mm (0.20 in) | 4.3 mm (0.17 in) | 55 years | 20 of 100 (Routine) |
| 29 August 2026 | Bullfrog Basin, US | daily high max (Tie, Provisional) | 39.4 C (102.9 F) | tie | 8 years | 2 of 100 (Routine) |
| 28 August 2026 | Bullfrog Basin, US | daily high max (Tie, Provisional) | 39.4 C (102.9 F) | tie | 5 years | 1 of 100 (Routine) |
| 22 August 2026 | Bullfrog Basin, US | daily high min (Provisional) | 24.4 C (75.9 F) | 1.1 C (2.0 F) | 48 years | 23 of 100 (Routine) |
| 21 August 2026 | Bullfrog Basin, US | daily high min (Provisional) | 27.2 C (81.0 F) | 2.8 C (5.0 F) | 3 years | 15 of 100 (Routine) |
| 15 August 2026 | Bullfrog Basin, US | daily low max (Tie) | 30.6 C (87.1 F) | tie | 57 years | 5 of 100 (Routine) |
| 8 August 2026 | Bullfrog Basin, US | daily high max (Tie) | 41.7 C (107.1 F) | tie | 56 years | 5 of 100 (Routine) |
| 7 August 2026 | Bullfrog Basin, US | daily high max | 41.7 C (107.1 F) | 0.6 C (1.1 F) | 56 years | 25 of 100 (Routine) |
| 6 August 2026 | Bullfrog Basin, US | daily high max (Tie) | 41.7 C (107.1 F) | tie | 1 year | 1 of 100 (Routine) |
| 5 August 2026 | Bullfrog Basin, US | daily high max (Tie) | 41.7 C (107.1 F) | tie | 56 years | 5 of 100 (Routine) |
| 4 August 2026 | Bullfrog Basin, US | daily high max | 43.3 C (109.9 F) | 2.2 C (4.0 F) | 5 years | 14 of 100 (Routine) |
| 3 August 2026 | Bullfrog Basin, US | monthly high max | 43.9 C (111.0 F) | 1.1 C (2.0 F) | 0 years | 19 of 100 (Routine) |
| 2 August 2026 | Bullfrog Basin, US | monthly high max | 42.8 C (109.0 F) | 0.6 C (1.1 F) | 6 years | 19 of 100 (Routine) |
| 1 August 2026 | Bullfrog Basin, US | daily high min | 25.0 C (77.0 F) | 0.6 C (1.1 F) | 24 years | 15 of 100 (Routine) |
| 29 July 2026 | Bullfrog Basin, US | daily high min (Tie) | 27.2 C (81.0 F) | tie | 20 years | 3 of 100 (Routine) |
| 28 July 2026 | Bullfrog Basin, US | daily high min (Tie) | 26.1 C (79.0 F) | tie | 8 years | 2 of 100 (Routine) |
| 26 July 2026 | Bullfrog Basin, US | daily high max | 41.7 C (107.1 F) | 0.6 C (1.1 F) | 59 years | 25 of 100 (Routine) |
Climate Trend
42 complete years, 1968 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1968 | 14.9 C | -0.46 C |
| 1969 | 15.4 C | +0.03 C |
| 1970 | 15.5 C | +0.16 C |
| 1971 | 14.9 C | -0.51 C |
| 1972 | 15.6 C | +0.25 C |
| 1973 | 14.5 C | -0.91 C |
| 1974 | 14.9 C | -0.44 C |
| 1975 | 13.3 C | -2.07 C |
| 1976 | 15.1 C | -0.25 C |
| 1977 | 16.0 C | +0.59 C |
| 1978 | 15.7 C | +0.29 C |
| 1979 | 14.2 C | -1.22 C |
| 1980 | 15.4 C | +0.02 C |
| 1981 | 16.1 C | +0.72 C |
| 1982 | 14.7 C | -0.66 C |
| 1983 | 15.3 C | -0.03 C |
| 1984 | 15.0 C | -0.34 C |
| 1985 | 15.7 C | +0.30 C |
| 1987 | 15.2 C | -0.18 C |
| 1988 | 16.0 C | +0.66 C |
| 1998 | 15.2 C | -0.13 C |
| 1999 | 15.2 C | -0.14 C |
| 2000 | 16.3 C | +0.88 C |
| 2002 | 15.4 C | -0.02 C |
| 2004 | 15.0 C | -0.34 C |
| 2006 | 15.4 C | +0.01 C |
| 2007 | 15.9 C | +0.49 C |
| 2010 | 14.8 C | -0.61 C |
| 2011 | 14.7 C | -0.69 C |
| 2012 | 16.2 C | +0.87 C |
| 2013 | 14.6 C | -0.73 C |
| 2014 | 15.5 C | +0.17 C |
| 2015 | 15.3 C | -0.06 C |
| 2016 | 15.8 C | +0.43 C |
| 2017 | 16.4 C | +1.00 C |
| 2018 | 16.1 C | +0.72 C |
| 2019 | 14.8 C | -0.58 C |
| 2020 | 15.6 C | +0.25 C |
| 2021 | 16.2 C | +0.86 C |
| 2023 | 15.1 C | -0.28 C |
| 2024 | 16.3 C | +0.97 C |
| 2025 | 16.2 C | +0.80 C |
The annual mean temperature here has risen by 0.13 C (0.02 to 0.23) per decade over 1968 to 2025. In Fahrenheit: 0.23 F (0.04 to 0.41) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.13 C (0.02 to 0.23) per decade | 0.23 F (0.04 to 0.41) per decade | 1968 to 2025 | 42 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.6) per decade | 1968 to 2025 | 42 | Rise |
| Mean daily minimum | 0.04 C (-0.07 to 0.15) per decade | 0.1 F (-0.1 to 0.3) per decade | 1968 to 2025 | 42 | 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
1967 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 45.6 C (114.1 F) | 2021 | 41.7 C (107.1 F) | 54 |
| Coldest night (TNn) | -17.8 C (0.0 F) | 1990 | -10.6 C (12.9 F) | 54 |
| Wettest day (Rx1day) | 44.2 mm (1.7 in) | 1969 | 17.8 mm (0.7 in) | 54 |
| Wettest five days (Rx5day) | 84.2 mm (3.3 in) | 1972 | 25.5 mm (1.0 in) | 54 |
| Longest dry spell (CDD) | 156 days | 1972 | 60 days | 54 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1967 | 41.1 C (106.0 F) |
| 1968 | 41.7 C (107.1 F) |
| 1969 | 41.7 C (107.1 F) |
| 1970 | 43.3 C (109.9 F) |
| 1971 | 43.3 C (109.9 F) |
| 1972 | 41.7 C (107.1 F) |
| 1973 | 42.2 C (108.0 F) |
| 1974 | 41.7 C (107.1 F) |
| 1975 | 40.0 C (104.0 F) |
| 1976 | 41.7 C (107.1 F) |
| 1977 | 40.6 C (105.1 F) |
| 1978 | 41.1 C (106.0 F) |
| 1979 | 41.1 C (106.0 F) |
| 1980 | 42.2 C (108.0 F) |
| 1981 | 41.7 C (107.1 F) |
| 1982 | 40.6 C (105.1 F) |
| 1983 | 39.4 C (102.9 F) |
| 1984 | 40.6 C (105.1 F) |
| 1985 | 43.3 C (109.9 F) |
| 1986 | 40.6 C (105.1 F) |
| 1987 | 40.0 C (104.0 F) |
| 1988 | 42.2 C (108.0 F) |
| 1989 | 43.3 C (109.9 F) |
| 1990 | 33.9 C (93.0 F) |
| 1997 | 42.2 C (108.0 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 41.7 C (107.1 F) |
| 2000 | 40.6 C (105.1 F) |
| 2001 | 41.7 C (107.1 F) |
| 2002 | 42.8 C (109.0 F) |
| 2003 | 43.3 C (109.9 F) |
| 2004 | 40.0 C (104.0 F) |
| 2005 | 42.8 C (109.0 F) |
| 2006 | 42.8 C (109.0 F) |
| 2007 | 41.7 C (107.1 F) |
| 2008 | 40.6 C (105.1 F) |
| 2009 | 41.7 C (107.1 F) |
| 2010 | 41.7 C (107.1 F) |
| 2011 | 41.1 C (106.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 42.8 C (109.0 F) |
| 2014 | 40.6 C (105.1 F) |
| 2015 | 41.1 C (106.0 F) |
| 2016 | 42.8 C (109.0 F) |
| 2017 | 43.3 C (109.9 F) |
| 2018 | 42.2 C (108.0 F) |
| 2019 | 41.1 C (106.0 F) |
| 2020 | 42.8 C (109.0 F) |
| 2021 | 45.6 C (114.1 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 44.4 C (111.9 F) |
| 2024 | 42.8 C (109.0 F) |
| 2025 | 42.2 C (108.0 F) |
| 2026 | 43.9 C (111.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1967 | -13.3 C (8.1 F) |
| 1968 | -15.0 C (5.0 F) |
| 1969 | -7.2 C (19.0 F) |
| 1970 | -13.9 C (7.0 F) |
| 1971 | -16.1 C (3.0 F) |
| 1972 | -11.7 C (10.9 F) |
| 1973 | -12.8 C (9.0 F) |
| 1974 | -15.6 C (3.9 F) |
| 1975 | -11.1 C (12.0 F) |
| 1976 | -10.6 C (12.9 F) |
| 1977 | -11.7 C (10.9 F) |
| 1978 | -15.0 C (5.0 F) |
| 1979 | -15.6 C (3.9 F) |
| 1980 | -5.0 C (23.0 F) |
| 1981 | -6.1 C (21.0 F) |
| 1982 | -13.3 C (8.1 F) |
| 1983 | -8.3 C (17.1 F) |
| 1984 | -11.1 C (12.0 F) |
| 1985 | -11.1 C (12.0 F) |
| 1986 | -8.3 C (17.1 F) |
| 1987 | -8.9 C (16.0 F) |
| 1988 | -10.6 C (12.9 F) |
| 1989 | -15.6 C (3.9 F) |
| 1990 | -17.8 C (0.0 F) |
| 1997 | -6.7 C (19.9 F) |
| 1998 | -12.2 C (10.0 F) |
| 1999 | -7.2 C (19.0 F) |
| 2000 | -7.8 C (18.0 F) |
| 2001 | -8.9 C (16.0 F) |
| 2002 | -9.4 C (15.1 F) |
| 2003 | -7.8 C (18.0 F) |
| 2004 | -8.9 C (16.0 F) |
| 2005 | -10.6 C (12.9 F) |
| 2006 | -8.3 C (17.1 F) |
| 2007 | -10.0 C (14.0 F) |
| 2008 | -10.6 C (12.9 F) |
| 2009 | -8.9 C (16.0 F) |
| 2010 | -11.1 C (12.0 F) |
| 2011 | -12.2 C (10.0 F) |
| 2012 | -7.8 C (18.0 F) |
| 2013 | -12.8 C (9.0 F) |
| 2014 | -7.8 C (18.0 F) |
| 2015 | -11.1 C (12.0 F) |
| 2016 | -10.0 C (14.0 F) |
| 2017 | -7.8 C (18.0 F) |
| 2018 | -8.9 C (16.0 F) |
| 2019 | -11.7 C (10.9 F) |
| 2020 | -9.4 C (15.1 F) |
| 2021 | -8.9 C (16.0 F) |
| 2022 | -10.0 C (14.0 F) |
| 2023 | -15.6 C (3.9 F) |
| 2024 | -8.9 C (16.0 F) |
| 2025 | -12.2 C (10.0 F) |
| 2026 | -7.8 C (18.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1967 | 11.4 mm (0.4 in) |
| 1968 | 4.8 mm (0.19 in) |
| 1969 | 44.2 mm (1.7 in) |
| 1970 | 16.3 mm (0.6 in) |
| 1971 | 14.2 mm (0.6 in) |
| 1972 | 27.2 mm (1.1 in) |
| 1973 | 18.0 mm (0.7 in) |
| 1974 | 13.7 mm (0.5 in) |
| 1975 | 13.2 mm (0.5 in) |
| 1976 | 12.7 mm (0.5 in) |
| 1977 | 22.4 mm (0.9 in) |
| 1978 | 30.2 mm (1.2 in) |
| 1979 | 24.1 mm (0.9 in) |
| 1980 | 19.8 mm (0.8 in) |
| 1981 | 28.2 mm (1.1 in) |
| 1982 | 12.7 mm (0.5 in) |
| 1983 | 24.1 mm (0.9 in) |
| 1984 | 11.4 mm (0.4 in) |
| 1985 | 18.5 mm (0.7 in) |
| 1986 | 11.7 mm (0.5 in) |
| 1987 | 17.5 mm (0.7 in) |
| 1988 | 14.0 mm (0.6 in) |
| 1989 | 30.5 mm (1.2 in) |
| 1990 | 13.2 mm (0.5 in) |
| 1997 | 16.5 mm (0.6 in) |
| 1998 | 18.0 mm (0.7 in) |
| 1999 | 14.5 mm (0.6 in) |
| 2000 | 15.5 mm (0.6 in) |
| 2001 | 16.5 mm (0.6 in) |
| 2002 | 41.9 mm (1.6 in) |
| 2003 | 22.4 mm (0.9 in) |
| 2004 | 15.7 mm (0.6 in) |
| 2005 | 18.3 mm (0.7 in) |
| 2006 | 42.4 mm (1.7 in) |
| 2007 | 21.1 mm (0.8 in) |
| 2008 | 10.4 mm (0.4 in) |
| 2009 | 22.6 mm (0.9 in) |
| 2010 | 26.2 mm (1.0 in) |
| 2011 | 8.1 mm (0.32 in) |
| 2012 | 8.4 mm (0.33 in) |
| 2013 | 27.7 mm (1.1 in) |
| 2014 | 27.4 mm (1.1 in) |
| 2015 | 19.1 mm (0.8 in) |
| 2016 | 19.6 mm (0.8 in) |
| 2017 | 42.4 mm (1.7 in) |
| 2018 | 16.3 mm (0.6 in) |
| 2019 | 16.3 mm (0.6 in) |
| 2020 | 14.7 mm (0.6 in) |
| 2021 | 29.2 mm (1.1 in) |
| 2022 | 8.1 mm (0.32 in) |
| 2023 | 14.0 mm (0.6 in) |
| 2024 | 27.7 mm (1.1 in) |
| 2025 | 19.8 mm (0.8 in) |
| 2026 | 9.9 mm (0.39 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1967 | 20.1 mm (0.8 in) |
| 1968 | 8.1 mm (0.32 in) |
| 1969 | 44.2 mm (1.7 in) |
| 1970 | 16.3 mm (0.6 in) |
| 1971 | 22.2 mm (0.9 in) |
| 1972 | 84.2 mm (3.3 in) |
| 1973 | 19.3 mm (0.8 in) |
| 1974 | 19.3 mm (0.8 in) |
| 1975 | 15.0 mm (0.6 in) |
| 1976 | 31.0 mm (1.2 in) |
| 1977 | 25.2 mm (1.0 in) |
| 1978 | 36.4 mm (1.4 in) |
| 1979 | 47.4 mm (1.9 in) |
| 1980 | 33.3 mm (1.3 in) |
| 1981 | 40.7 mm (1.6 in) |
| 1982 | 16.3 mm (0.6 in) |
| 1983 | 30.2 mm (1.2 in) |
| 1984 | 19.5 mm (0.8 in) |
| 1985 | 23.6 mm (0.9 in) |
| 1986 | 17.5 mm (0.7 in) |
| 1987 | 32.5 mm (1.3 in) |
| 1988 | 18.6 mm (0.7 in) |
| 1989 | 38.1 mm (1.5 in) |
| 1990 | 13.2 mm (0.5 in) |
| 1997 | 27.0 mm (1.1 in) |
| 1998 | 36.5 mm (1.4 in) |
| 1999 | 17.3 mm (0.7 in) |
| 2000 | 25.7 mm (1.0 in) |
| 2001 | 20.0 mm (0.8 in) |
| 2002 | 54.8 mm (2.2 in) |
| 2003 | 24.4 mm (1.0 in) |
| 2004 | 22.1 mm (0.9 in) |
| 2005 | 28.7 mm (1.1 in) |
| 2006 | 71.9 mm (2.8 in) |
| 2007 | 24.1 mm (0.9 in) |
| 2008 | 13.0 mm (0.5 in) |
| 2009 | 23.9 mm (0.9 in) |
| 2010 | 50.3 mm (2.0 in) |
| 2011 | 21.3 mm (0.8 in) |
| 2012 | 12.4 mm (0.5 in) |
| 2013 | 61.0 mm (2.4 in) |
| 2014 | 29.9 mm (1.2 in) |
| 2015 | 30.8 mm (1.2 in) |
| 2016 | 26.2 mm (1.0 in) |
| 2017 | 43.2 mm (1.7 in) |
| 2018 | 40.4 mm (1.6 in) |
| 2019 | 26.2 mm (1.0 in) |
| 2020 | 24.8 mm (1.0 in) |
| 2021 | 35.6 mm (1.4 in) |
| 2022 | 10.9 mm (0.4 in) |
| 2023 | 21.6 mm (0.9 in) |
| 2024 | 35.6 mm (1.4 in) |
| 2025 | 29.1 mm (1.1 in) |
| 2026 | 10.2 mm (0.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1967 | 64 days |
| 1968 | 54 days |
| 1969 | 55 days |
| 1970 | 59 days |
| 1971 | 109 days |
| 1972 | 156 days |
| 1973 | 53 days |
| 1974 | 104 days |
| 1975 | 61 days |
| 1976 | 96 days |
| 1977 | 57 days |
| 1978 | 74 days |
| 1979 | 65 days |
| 1980 | 51 days |
| 1981 | 42 days |
| 1982 | 45 days |
| 1983 | 31 days |
| 1984 | 48 days |
| 1985 | 43 days |
| 1986 | 60 days |
| 1987 | 58 days |
| 1988 | 65 days |
| 1989 | 60 days |
| 1990 | 57 days |
| 1997 | 54 days |
| 1998 | 35 days |
| 1999 | 68 days |
| 2000 | 66 days |
| 2001 | 68 days |
| 2002 | 82 days |
| 2003 | 74 days |
| 2004 | 52 days |
| 2005 | 49 days |
| 2006 | 54 days |
| 2007 | 78 days |
| 2008 | 44 days |
| 2009 | 79 days |
| 2010 | 40 days |
| 2011 | 24 days |
| 2012 | 118 days |
| 2013 | 93 days |
| 2014 | 70 days |
| 2015 | 57 days |
| 2016 | 42 days |
| 2017 | 94 days |
| 2018 | 110 days |
| 2019 | 47 days |
| 2020 | 78 days |
| 2021 | 108 days |
| 2022 | 60 days |
| 2023 | 53 days |
| 2024 | 147 days |
| 2025 | 44 days |
| 2026 | 100 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
42 years with a frostAcross 42 years with a frost, the median last spring frost at Bullfrog Basin falls on 1 April and the median first autumn frost on 10 November, which leaves a median of 224 days between them.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1980 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 1 April | n/a | 31 March | n/a | -1.2 days per decade |
| First autumn frost | 10 November | n/a | 10 November | n/a | +0.3 days per decade |
| Growing days | 224 days | n/a | 226 days | n/a | +1.5 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
45 years, 1968 to 2025A day with at least 18.8 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 53.4 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 | 18.8 mm (0.7 in) | |
| 5 years | 27.1 mm (1.1 in) | |
| 10 years | 33.0 mm (1.3 in) | |
| 25 years | 40.8 mm (1.6 in) | |
| 50 years | 47.0 mm (1.9 in) | Longer than the 45 years of record |
| 100 years | 53.4 mm (2.1 in) | Longer than the 45 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, 45 years of values from 1968 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: 44.2 mm (1.7 in) in 1969; 42.4 mm (1.7 in) in 2006; 42.4 mm (1.7 in) in 2017.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Bullfrog Basin, at 1974. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1974 ran 0.4 C (0.8 F) lower than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1974 | -0.4 | -0.8 | 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
2010 to 2025 against 1961 to 1990Over 2010 to 2025, Bullfrog Basin had a mean temperature of 15.6 C (60.0 F) and 150.9 mm (5.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Turkmen-Bashi (Turkmenistan, 11,230 km away), Wupatki Nm (United States, 231 km away) and St George (United States, 260 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Turkmen-Bashi | Turkmenistan | 11,230 km (6,978 mi) | 15.3 C (59.6 F) | 145.2 mm (5.7 in) | 1.47 |
| Wupatki Nm | United States | 231 km (144 mi) | 14.4 C (58.0 F) | 211.7 mm (8.3 in) | 1.72 |
| St George | United States | 260 km (162 mi) | 16.9 C (62.4 F) | 189.3 mm (7.5 in) | 1.74 |
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).