Jeffrey City Weather Records (USC00484925)
Record envelope, standing records and threshold days for Jeffrey City (USC00484925), Wyoming, United States, with 63 years of record.
Key Facts for Jeffrey City
- Jeffrey City (USC00484925) is a weather station in Wyoming, United States at 42.49 latitude and -107.83 longitude, 1,926 m (6,320 ft) above sea level.
- The station reports from 1964 to 2026, 63 years of record.
- 1,464 records set at Jeffrey City still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Jeffrey City set a daily record high maximum temperature of 33.9 C (93.0 F) on 31 August 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, 42.49 latitude, -107.83 longitude.
- Elevation: 1,926 m (6,320 ft).
- Period of record: 1964 to 2026, 63 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
54 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 13.9 C (57.0 F) | -45.0 C (-49.0 F) | 12.8 C (55.0 F) | -27.2 C (-17.0 F) |
| Feb | 15.6 C (60.1 F) | -39.4 C (-38.9 F) | 13.9 C (57.0 F) | -25.6 C (-14.1 F) |
| Mar | 25.6 C (78.1 F) | -36.1 C (-33.0 F) | 25.6 C (78.1 F) | -18.9 C (-2.0 F) |
| Apr | 26.7 C (80.1 F) | -27.8 C (-18.0 F) | 25.0 C (77.0 F) | -17.2 C (1.0 F) |
| May | 33.3 C (91.9 F) | -11.7 C (10.9 F) | 31.1 C (88.0 F) | -8.3 C (17.1 F) |
| Jun | 37.2 C (99.0 F) | -2.8 C (27.0 F) | 32.8 C (91.0 F) | -1.1 C (30.0 F) |
| Jul | 38.3 C (100.9 F) | 0.0 C (32.0 F) | 38.3 C (100.9 F) | 5.0 C (41.0 F) |
| Aug | 37.2 C (99.0 F) | -2.2 C (28.0 F) | 37.2 C (99.0 F) | 6.1 C (43.0 F) |
| Sep | 34.4 C (93.9 F) | -17.2 C (1.0 F) | n/a | n/a |
| Oct | 30.6 C (87.1 F) | -32.8 C (-27.0 F) | 24.4 C (75.9 F) | -0.6 C (30.9 F) |
| Nov | 20.6 C (69.1 F) | -35.0 C (-31.0 F) | n/a | n/a |
| Dec | 16.7 C (62.1 F) | -43.3 C (-45.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1964 | 23 |
| 1965 | 28 |
| 1966 | 18 |
| 1978 | 9 |
| 1979 | 33 |
| 1980 | 24 |
| 1981 | 33 |
| 1982 | 19 |
| 1983 | 25 |
| 1984 | 26 |
| 1985 | 31 |
| 1986 | 16 |
| 1987 | 33 |
| 1988 | 26 |
| 1989 | 32 |
| 1990 | 27 |
| 1991 | 29 |
| 1992 | 22 |
| 1993 | 33 |
| 1994 | 16 |
| 1995 | 38 |
| 1996 | 42 |
| 1997 | 31 |
| 1998 | 24 |
| 1999 | 28 |
| 2000 | 40 |
| 2001 | 14 |
| 2002 | 27 |
| 2003 | 50 |
| 2004 | 16 |
| 2005 | 30 |
| 2006 | 30 |
| 2007 | 23 |
| 2008 | 19 |
| 2009 | 40 |
| 2010 | 19 |
| 2011 | 18 |
| 2012 | 22 |
| 2013 | 31 |
| 2014 | 37 |
| 2015 | 41 |
| 2016 | 19 |
| 2017 | 16 |
| 2018 | 18 |
| 2019 | 16 |
| 2020 | 39 |
| 2021 | 38 |
| 2022 | 36 |
| 2023 | 21 |
| 2024 | 24 |
| 2025 | 50 |
| 2026 | 64 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 2022-08-25 | Record daily precipitation | Record daily precipitation 69.9 mm (2.8 in) |
| 2023-01-30 | Record low minimum temperature | Record low minimum temperature -45.0 C (-49.0 F) |
| 2026-07-13 | Record high maximum temperature | Record high maximum temperature 38.3 C (100.9 F) |
Wettest Day of Each Month
Aug: 69.9 mm (2.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 27.9 mm (1.1 in) | 2 January 2023 |
| Feb | 54.1 mm (2.1 in) | 22 February 2023 |
| Mar | 30.5 mm (1.2 in) | 11 March 1988 |
| Apr | 49.0 mm (1.9 in) | 4 April 2023 |
| May | 64.3 mm (2.5 in) | 8 May 1965 |
| Jun | 41.9 mm (1.6 in) | 26 June 1985 |
| Jul | 30.5 mm (1.2 in) | 30 July 1990 |
| Aug | 69.9 mm (2.8 in) | 25 August 2022 |
| Sep | 42.9 mm (1.7 in) | 14 September 1982 |
| Oct | 39.9 mm (1.6 in) | 4 October 1994 |
| Nov | 24.4 mm (1.0 in) | 28 November 1983 |
| Dec | 20.3 mm (0.8 in) | 20 December 1983 |
Period of Record Coverage
1964 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1964 | 261 | 71% | No |
| 1965 | 238 | 65% | No |
| 1966 | 123 | 34% | No |
| 1978 | 122 | 33% | No |
| 1979 | 365 | 100% | Yes |
| 1980 | 334 | 91% | Yes |
| 1981 | 249 | 68% | No |
| 1982 | 253 | 69% | No |
| 1983 | 251 | 69% | No |
| 1984 | 246 | 67% | No |
| 1985 | 243 | 67% | No |
| 1986 | 247 | 68% | No |
| 1987 | 250 | 68% | No |
| 1988 | 326 | 89% | No |
| 1989 | 363 | 99% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 364 | 99% | Yes |
| 1993 | 362 | 99% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 360 | 99% | Yes |
| 1996 | 355 | 97% | Yes |
| 1997 | 358 | 98% | Yes |
| 1998 | 361 | 99% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 363 | 99% | Yes |
| 2004 | 357 | 98% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 360 | 99% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 360 | 99% | Yes |
| 2010 | 360 | 99% | Yes |
| 2011 | 357 | 98% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 356 | 98% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 360 | 99% | Yes |
| 2016 | 363 | 99% | Yes |
| 2017 | 357 | 98% | Yes |
| 2018 | 361 | 99% | Yes |
| 2019 | 363 | 99% | Yes |
| 2020 | 364 | 99% | Yes |
| 2021 | 363 | 99% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 334 | 91% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 244 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 31 August 2026 | Jeffrey City, US | daily high max (Provisional) | 33.9 C (93.0 F) | 2.2 C (4.0 F) | 28 years | 20 of 100 (Routine) |
| 25 August 2026 | Jeffrey City, US | daily high min (Tie, Provisional) | 15.0 C (59.0 F) | tie | 28 years | 3 of 100 (Routine) |
| 24 August 2026 | Jeffrey City, US | daily high min (Provisional) | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 23 years | 15 of 100 (Routine) |
| 22 August 2026 | Jeffrey City, US | daily high min (Tie, Provisional) | 15.6 C (60.1 F) | tie | 31 years | 3 of 100 (Routine) |
| 20 August 2026 | Jeffrey City, US | daily high max (Tie, Provisional) | 33.9 C (93.0 F) | tie | 40 years | 4 of 100 (Routine) |
| 13 August 2026 | Jeffrey City, US | daily rain | 20.8 mm (0.8 in) | 15.5 mm (0.6 in) | 20 years | 20 of 100 (Routine) |
| 13 August 2026 | Jeffrey City, US | monthly high max (Tie) | 37.2 C (99.0 F) | tie | 0 years | 4 of 100 (Routine) |
| 11 August 2026 | Jeffrey City, US | daily high min | 18.3 C (64.9 F) | 3.3 C (5.9 F) | 27 years | 23 of 100 (Routine) |
| 11 August 2026 | Jeffrey City, US | daily high max (Tie) | 34.4 C (93.9 F) | tie | 4 years | 1 of 100 (Routine) |
| 9 August 2026 | Jeffrey City, US | daily high max | 35.6 C (96.1 F) | 1.2 C (2.2 F) | 43 years | 21 of 100 (Routine) |
| 8 August 2026 | Jeffrey City, US | daily high max | 35.6 C (96.1 F) | 1.2 C (2.2 F) | 31 years | 18 of 100 (Routine) |
| 7 August 2026 | Jeffrey City, US | daily high max | 35.6 C (96.1 F) | 0.6 C (1.1 F) | 24 years | 14 of 100 (Routine) |
| 2 August 2026 | Jeffrey City, US | monthly high max (Tie) | 37.2 C (99.0 F) | tie | 0 years | 4 of 100 (Routine) |
| 1 August 2026 | Jeffrey City, US | monthly high max | 37.2 C (99.0 F) | 1.1 C (2.0 F) | 1 year | 19 of 100 (Routine) |
| 27 July 2026 | Jeffrey City, US | daily high min | 18.9 C (66.0 F) | 1.1 C (2.0 F) | 16 years | 13 of 100 (Routine) |
| 26 July 2026 | Jeffrey City, US | daily high max | 37.2 C (99.0 F) | 1.6 C (2.9 F) | 4 years | 11 of 100 (Routine) |
| 25 July 2026 | Jeffrey City, US | daily high min | 20.0 C (68.0 F) | 2.8 C (5.0 F) | 24 years | 21 of 100 (Routine) |
| 23 July 2026 | Jeffrey City, US | daily rain | 22.9 mm (0.9 in) | 7.4 mm (0.29 in) | 21 years | 20 of 100 (Routine) |
| 23 July 2026 | Jeffrey City, US | daily high max | 37.2 C (99.0 F) | 0.5 C (0.9 F) | 20 years | 13 of 100 (Routine) |
| 21 July 2026 | Jeffrey City, US | daily high min | 18.3 C (64.9 F) | 1.1 C (2.0 F) | 61 years | 27 of 100 (Routine) |
Climate Trend
38 complete years, 1979 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1979 | 4.3 C | -1.41 C |
| 1983 | 5.0 C | -0.69 C |
| 1989 | 5.5 C | -0.18 C |
| 1990 | 5.8 C | +0.14 C |
| 1991 | 5.7 C | +0.00 C |
| 1992 | 5.8 C | +0.12 C |
| 1993 | 3.8 C | -1.95 C |
| 1994 | 6.1 C | +0.40 C |
| 1995 | 5.6 C | -0.08 C |
| 1996 | 5.6 C | -0.07 C |
| 1997 | 5.0 C | -0.69 C |
| 1998 | 5.9 C | +0.19 C |
| 1999 | 6.5 C | +0.75 C |
| 2000 | 5.8 C | +0.09 C |
| 2001 | 6.0 C | +0.32 C |
| 2002 | 5.1 C | -0.60 C |
| 2003 | 6.1 C | +0.43 C |
| 2004 | 5.5 C | -0.20 C |
| 2005 | 6.3 C | +0.58 C |
| 2006 | 6.1 C | +0.41 C |
| 2007 | 6.4 C | +0.71 C |
| 2008 | 4.8 C | -0.92 C |
| 2009 | 4.9 C | -0.79 C |
| 2010 | 5.5 C | -0.20 C |
| 2011 | 4.7 C | -0.99 C |
| 2012 | 7.1 C | +1.35 C |
| 2013 | 5.1 C | -0.62 C |
| 2014 | 5.5 C | -0.19 C |
| 2015 | 6.3 C | +0.55 C |
| 2016 | 6.5 C | +0.79 C |
| 2017 | 6.3 C | +0.60 C |
| 2018 | 6.1 C | +0.42 C |
| 2019 | 4.4 C | -1.31 C |
| 2020 | 5.8 C | +0.09 C |
| 2021 | 6.8 C | +1.09 C |
| 2022 | 6.0 C | +0.25 C |
| 2023 | 5.2 C | -0.54 C |
| 2025 | 7.8 C | +2.07 C |
The annual mean temperature here has risen by 0.24 C (0.03 to 0.45) per decade over 1979 to 2025. In Fahrenheit: 0.4 F (0.1 to 0.8) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.24 C (0.03 to 0.45) per decade | 0.4 F (0.1 to 0.8) per decade | 1979 to 2025 | 38 | Rise |
| Mean daily maximum | 0.31 C (0.04 to 0.58) per decade | 0.6 F (0.1 to 1.0) per decade | 1979 to 2025 | 38 | Rise |
| Mean daily minimum | 0.17 C (-0.01 to 0.36) per decade | 0.31 F (-0.03 to 0.65) per decade | 1979 to 2025 | 38 | 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
1964 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.3 C (100.9 F) | 2026 | 35.0 C (95.0 F) | 52 |
| Coldest night (TNn) | -45.0 C (-49.0 F) | 2023 | -34.4 C (-29.9 F) | 52 |
| Wettest day (Rx1day) | 69.9 mm (2.8 in) | 2022 | 24.6 mm (1.0 in) | 52 |
| Wettest five days (Rx5day) | 69.9 mm (2.8 in) | 2022 | 39.4 mm (1.6 in) | 52 |
| Longest dry spell (CDD) | 91 days | 2024 | 35 days | 52 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1964 | 33.9 C (93.0 F) |
| 1965 | 31.7 C (89.1 F) |
| 1966 | 35.0 C (95.0 F) |
| 1978 | 30.0 C (86.0 F) |
| 1979 | 35.6 C (96.1 F) |
| 1980 | 33.3 C (91.9 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 35.0 C (95.0 F) |
| 1984 | 33.9 C (93.0 F) |
| 1985 | 37.2 C (99.0 F) |
| 1986 | 35.6 C (96.1 F) |
| 1987 | 34.4 C (93.9 F) |
| 1988 | 35.6 C (96.1 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 34.4 C (93.9 F) |
| 1991 | 33.3 C (91.9 F) |
| 1992 | 33.3 C (91.9 F) |
| 1993 | 33.3 C (91.9 F) |
| 1994 | 35.0 C (95.0 F) |
| 1995 | 35.6 C (96.1 F) |
| 1996 | 35.0 C (95.0 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 35.6 C (96.1 F) |
| 1999 | 33.3 C (91.9 F) |
| 2000 | 34.4 C (93.9 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 36.1 C (97.0 F) |
| 2004 | 33.3 C (91.9 F) |
| 2005 | 36.7 C (98.1 F) |
| 2006 | 36.1 C (97.0 F) |
| 2007 | 35.6 C (96.1 F) |
| 2008 | 35.0 C (95.0 F) |
| 2009 | 33.3 C (91.9 F) |
| 2010 | 32.8 C (91.0 F) |
| 2011 | 33.9 C (93.0 F) |
| 2012 | 35.0 C (95.0 F) |
| 2013 | 33.9 C (93.0 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 33.3 C (91.9 F) |
| 2016 | 33.9 C (93.0 F) |
| 2017 | 33.9 C (93.0 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 35.6 C (96.1 F) |
| 2023 | 35.6 C (96.1 F) |
| 2024 | 36.1 C (97.0 F) |
| 2025 | 36.1 C (97.0 F) |
| 2026 | 38.3 C (100.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1964 | -37.8 C (-36.0 F) |
| 1965 | -32.2 C (-26.0 F) |
| 1966 | -29.4 C (-20.9 F) |
| 1978 | -37.2 C (-35.0 F) |
| 1979 | -39.4 C (-38.9 F) |
| 1980 | -35.6 C (-32.1 F) |
| 1981 | -26.1 C (-15.0 F) |
| 1982 | -34.4 C (-29.9 F) |
| 1983 | -38.9 C (-38.0 F) |
| 1984 | -35.0 C (-31.0 F) |
| 1985 | -38.9 C (-38.0 F) |
| 1986 | -31.1 C (-24.0 F) |
| 1987 | -35.6 C (-32.1 F) |
| 1988 | -30.6 C (-23.1 F) |
| 1989 | -36.1 C (-33.0 F) |
| 1990 | -43.3 C (-45.9 F) |
| 1991 | -29.4 C (-20.9 F) |
| 1992 | -36.7 C (-34.1 F) |
| 1993 | -32.8 C (-27.0 F) |
| 1994 | -27.8 C (-18.0 F) |
| 1995 | -28.3 C (-18.9 F) |
| 1996 | -34.4 C (-29.9 F) |
| 1997 | -27.2 C (-17.0 F) |
| 1998 | -35.0 C (-31.0 F) |
| 1999 | -23.9 C (-11.0 F) |
| 2000 | -32.2 C (-26.0 F) |
| 2001 | -35.6 C (-32.1 F) |
| 2002 | -35.0 C (-31.0 F) |
| 2003 | -31.7 C (-25.1 F) |
| 2004 | -29.4 C (-20.9 F) |
| 2005 | -32.8 C (-27.0 F) |
| 2006 | -37.2 C (-35.0 F) |
| 2007 | -29.4 C (-20.9 F) |
| 2008 | -33.3 C (-27.9 F) |
| 2009 | -36.7 C (-34.1 F) |
| 2010 | -33.3 C (-27.9 F) |
| 2011 | -36.7 C (-34.1 F) |
| 2012 | -26.1 C (-15.0 F) |
| 2013 | -35.0 C (-31.0 F) |
| 2014 | -38.3 C (-36.9 F) |
| 2015 | -37.8 C (-36.0 F) |
| 2016 | -31.7 C (-25.1 F) |
| 2017 | -37.8 C (-36.0 F) |
| 2018 | -27.8 C (-18.0 F) |
| 2019 | -33.3 C (-27.9 F) |
| 2020 | -27.2 C (-17.0 F) |
| 2021 | -29.4 C (-20.9 F) |
| 2022 | -42.8 C (-45.0 F) |
| 2023 | -45.0 C (-49.0 F) |
| 2024 | -38.3 C (-36.9 F) |
| 2025 | -41.1 C (-42.0 F) |
| 2026 | -27.2 C (-17.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1964 | 27.9 mm (1.1 in) |
| 1965 | 64.3 mm (2.5 in) |
| 1966 | 21.1 mm (0.8 in) |
| 1978 | 16.8 mm (0.7 in) |
| 1979 | 29.5 mm (1.2 in) |
| 1980 | 20.8 mm (0.8 in) |
| 1981 | 23.4 mm (0.9 in) |
| 1982 | 42.9 mm (1.7 in) |
| 1983 | 24.4 mm (1.0 in) |
| 1984 | 42.7 mm (1.7 in) |
| 1985 | 41.9 mm (1.6 in) |
| 1986 | 24.4 mm (1.0 in) |
| 1987 | 24.6 mm (1.0 in) |
| 1988 | 30.5 mm (1.2 in) |
| 1989 | 29.2 mm (1.1 in) |
| 1990 | 30.5 mm (1.2 in) |
| 1991 | 36.8 mm (1.4 in) |
| 1992 | 24.6 mm (1.0 in) |
| 1993 | 31.8 mm (1.3 in) |
| 1994 | 39.9 mm (1.6 in) |
| 1995 | 20.1 mm (0.8 in) |
| 1996 | 15.2 mm (0.6 in) |
| 1997 | 23.9 mm (0.9 in) |
| 1998 | 22.4 mm (0.9 in) |
| 1999 | 24.6 mm (1.0 in) |
| 2000 | 34.3 mm (1.4 in) |
| 2001 | 9.4 mm (0.37 in) |
| 2002 | 20.6 mm (0.8 in) |
| 2003 | 19.1 mm (0.8 in) |
| 2004 | 19.6 mm (0.8 in) |
| 2005 | 21.6 mm (0.9 in) |
| 2006 | 9.9 mm (0.39 in) |
| 2007 | 24.1 mm (0.9 in) |
| 2008 | 21.6 mm (0.9 in) |
| 2009 | 30.5 mm (1.2 in) |
| 2010 | 35.6 mm (1.4 in) |
| 2011 | 24.6 mm (1.0 in) |
| 2012 | 9.7 mm (0.38 in) |
| 2013 | 33.0 mm (1.3 in) |
| 2014 | 45.2 mm (1.8 in) |
| 2015 | 19.8 mm (0.8 in) |
| 2016 | 36.8 mm (1.4 in) |
| 2017 | 25.4 mm (1.0 in) |
| 2018 | 18.5 mm (0.7 in) |
| 2019 | 26.9 mm (1.1 in) |
| 2020 | 31.8 mm (1.3 in) |
| 2021 | 20.3 mm (0.8 in) |
| 2022 | 69.9 mm (2.8 in) |
| 2023 | 54.1 mm (2.1 in) |
| 2024 | 32.0 mm (1.3 in) |
| 2025 | 44.7 mm (1.8 in) |
| 2026 | 22.9 mm (0.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1964 | 46.9 mm (1.8 in) |
| 1965 | 65.3 mm (2.6 in) |
| 1966 | 26.5 mm (1.0 in) |
| 1978 | 22.0 mm (0.9 in) |
| 1979 | 31.0 mm (1.2 in) |
| 1980 | 48.1 mm (1.9 in) |
| 1981 | 23.4 mm (0.9 in) |
| 1982 | 45.7 mm (1.8 in) |
| 1983 | 34.9 mm (1.4 in) |
| 1984 | 55.6 mm (2.2 in) |
| 1985 | 50.5 mm (2.0 in) |
| 1986 | 39.4 mm (1.6 in) |
| 1987 | 28.0 mm (1.1 in) |
| 1988 | 40.7 mm (1.6 in) |
| 1989 | 35.0 mm (1.4 in) |
| 1990 | 32.8 mm (1.3 in) |
| 1991 | 56.9 mm (2.2 in) |
| 1992 | 41.1 mm (1.6 in) |
| 1993 | 36.4 mm (1.4 in) |
| 1994 | 46.0 mm (1.8 in) |
| 1995 | 47.5 mm (1.9 in) |
| 1996 | 45.1 mm (1.8 in) |
| 1997 | 44.5 mm (1.8 in) |
| 1998 | 35.1 mm (1.4 in) |
| 1999 | 51.3 mm (2.0 in) |
| 2000 | 34.3 mm (1.4 in) |
| 2001 | 17.5 mm (0.7 in) |
| 2002 | 24.4 mm (1.0 in) |
| 2003 | 43.2 mm (1.7 in) |
| 2004 | 36.4 mm (1.4 in) |
| 2005 | 24.4 mm (1.0 in) |
| 2006 | 16.0 mm (0.6 in) |
| 2007 | 31.0 mm (1.2 in) |
| 2008 | 37.4 mm (1.5 in) |
| 2009 | 42.4 mm (1.7 in) |
| 2010 | 66.1 mm (2.6 in) |
| 2011 | 32.0 mm (1.3 in) |
| 2012 | 10.9 mm (0.4 in) |
| 2013 | 44.2 mm (1.7 in) |
| 2014 | 48.5 mm (1.9 in) |
| 2015 | 40.9 mm (1.6 in) |
| 2016 | 60.7 mm (2.4 in) |
| 2017 | 36.6 mm (1.4 in) |
| 2018 | 36.5 mm (1.4 in) |
| 2019 | 39.4 mm (1.6 in) |
| 2020 | 33.1 mm (1.3 in) |
| 2021 | 40.9 mm (1.6 in) |
| 2022 | 69.9 mm (2.8 in) |
| 2023 | 54.1 mm (2.1 in) |
| 2024 | 32.0 mm (1.3 in) |
| 2025 | 47.3 mm (1.9 in) |
| 2026 | 27.7 mm (1.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1964 | 46 days |
| 1965 | 27 days |
| 1966 | 26 days |
| 1978 | 29 days |
| 1979 | 54 days |
| 1980 | 53 days |
| 1981 | 47 days |
| 1982 | 22 days |
| 1983 | 28 days |
| 1984 | 22 days |
| 1985 | 27 days |
| 1986 | 22 days |
| 1987 | 35 days |
| 1988 | 83 days |
| 1989 | 45 days |
| 1990 | 43 days |
| 1991 | 22 days |
| 1992 | 34 days |
| 1993 | 22 days |
| 1994 | 46 days |
| 1995 | 45 days |
| 1996 | 38 days |
| 1997 | 23 days |
| 1998 | 31 days |
| 1999 | 36 days |
| 2000 | 28 days |
| 2001 | 34 days |
| 2002 | 39 days |
| 2003 | 41 days |
| 2004 | 39 days |
| 2005 | 59 days |
| 2006 | 35 days |
| 2007 | 35 days |
| 2008 | 48 days |
| 2009 | 33 days |
| 2010 | 37 days |
| 2011 | 27 days |
| 2012 | 56 days |
| 2013 | 27 days |
| 2014 | 32 days |
| 2015 | 33 days |
| 2016 | 34 days |
| 2017 | 33 days |
| 2018 | 42 days |
| 2019 | 38 days |
| 2020 | 46 days |
| 2021 | 33 days |
| 2022 | 22 days |
| 2023 | 29 days |
| 2024 | 91 days |
| 2025 | 48 days |
| 2026 | 31 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
38 years with a frostAcross 38 years with a frost, the median last spring frost at Jeffrey City falls on 31 May and the median first autumn frost on 14 September, which leaves a median of 106 days between them.
Fitted over all years, the growing season changes by +1.7 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1995 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 31 May | n/a | 31 May | n/a | -1.5 days per decade |
| First autumn frost | 14 September | n/a | 14 September | n/a | +0.2 days per decade |
| Growing days | 106 days | n/a | 106 days | n/a | +1.7 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
40 years, 1979 to 2025A day with at least 25.9 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 65.5 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 | 25.9 mm (1.0 in) | |
| 5 years | 36.1 mm (1.4 in) | |
| 10 years | 43.0 mm (1.7 in) | |
| 25 years | 51.9 mm (2.0 in) | |
| 50 years | 58.7 mm (2.3 in) | Longer than the 40 years of record |
| 100 years | 65.5 mm (2.6 in) | Longer than the 40 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 40 years of values from 1979 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: 69.9 mm (2.8 in) in 2022; 54.1 mm (2.1 in) in 2023; 45.2 mm (1.8 in) in 2014.
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).