Grassy Lake Weather Records (USS0010E15S)
Record envelope, standing records and threshold days for Grassy Lake (USS0010E15S), Wyoming, United States, with 48 years of record.
Key Facts for Grassy Lake
- Grassy Lake (USS0010E15S) is a weather station in Wyoming, United States at 44.13 latitude and -110.83 longitude, 2,214 m (7,265 ft) above sea level.
- The station reports from 1979 to 2026, 48 years of record.
- 1,464 records set at Grassy Lake still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Grassy Lake set a daily record high maximum temperature of 21.3 C (70.3 F) on 7 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, 44.13 latitude, -110.83 longitude.
- Elevation: 2,214 m (7,265 ft).
- Period of record: 1979 to 2026, 48 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
9 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 8.3 C (46.9 F) | -37.0 C (-34.6 F) | 3.5 C (38.3 F) | -27.0 C (-16.6 F) |
| Feb | 14.3 C (57.7 F) | -35.4 C (-31.7 F) | 14.3 C (57.7 F) | -29.5 C (-21.1 F) |
| Mar | 17.9 C (64.2 F) | -35.7 C (-32.3 F) | n/a | n/a |
| Apr | 22.1 C (71.8 F) | -25.5 C (-13.9 F) | n/a | n/a |
| May | 26.9 C (80.4 F) | -18.7 C (-1.7 F) | n/a | n/a |
| Jun | 30.8 C (87.4 F) | -8.5 C (16.7 F) | n/a | n/a |
| Jul | 34.6 C (94.3 F) | -3.7 C (25.3 F) | n/a | n/a |
| Aug | 33.9 C (93.0 F) | -8.3 C (17.1 F) | 30.5 C (86.9 F) | -3.4 C (25.9 F) |
| Sep | 31.0 C (87.8 F) | -11.6 C (11.1 F) | 24.3 C (75.7 F) | -4.5 C (23.9 F) |
| Oct | 24.9 C (76.8 F) | -28.1 C (-18.6 F) | 23.0 C (73.4 F) | -3.4 C (25.9 F) |
| Nov | 16.4 C (61.5 F) | -31.2 C (-24.2 F) | n/a | n/a |
| Dec | 7.4 C (45.3 F) | -36.6 C (-33.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1988 | 10 |
| 1989 | 39 |
| 1990 | 42 |
| 1991 | 31 |
| 1992 | 44 |
| 1993 | 40 |
| 1994 | 32 |
| 1995 | 37 |
| 1996 | 17 |
| 1997 | 26 |
| 1998 | 25 |
| 1999 | 49 |
| 2000 | 26 |
| 2001 | 34 |
| 2002 | 46 |
| 2003 | 54 |
| 2004 | 30 |
| 2005 | 32 |
| 2006 | 41 |
| 2007 | 49 |
| 2008 | 44 |
| 2009 | 43 |
| 2010 | 43 |
| 2011 | 36 |
| 2012 | 39 |
| 2013 | 44 |
| 2014 | 53 |
| 2015 | 41 |
| 2016 | 34 |
| 2017 | 41 |
| 2018 | 32 |
| 2019 | 38 |
| 2020 | 39 |
| 2021 | 39 |
| 2022 | 54 |
| 2023 | 37 |
| 2024 | 43 |
| 2025 | 55 |
| 2026 | 5 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 2012-01-19 | Record daily precipitation | Record daily precipitation 81.3 mm (3.2 in) |
| 2022-03-10 | Record low minimum temperature | Record low minimum temperature -35.7 C (-32.3 F) |
| 2022-12-22 | Record low minimum temperature | Record low minimum temperature -36.6 C (-33.9 F) |
| 2025-01-20 | Record low minimum temperature | Record low minimum temperature -37.0 C (-34.6 F) |
Wettest Day of Each Month
Jan: 81.3 mm (3.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 81.3 mm (3.2 in) | 19 January 2012 |
| Feb | 63.5 mm (2.5 in) | 2 February 2025 |
| Mar | 40.6 mm (1.6 in) | 26 March 2003 |
| Apr | 40.6 mm (1.6 in) | 25 April 1983 |
| May | 45.7 mm (1.8 in) | 22 May 2002 |
| Jun | 53.3 mm (2.1 in) | 8 June 1981 |
| Jul | 27.9 mm (1.1 in) | 20 July 1984 |
| Aug | 35.6 mm (1.4 in) | 21 August 2014 |
| Sep | 48.3 mm (1.9 in) | 30 September 2014 |
| Oct | 63.5 mm (2.5 in) | 19 October 2007 |
| Nov | 55.9 mm (2.2 in) | 19 November 1996 |
| Dec | 61.0 mm (2.4 in) | 15 December 2016 |
Period of Record Coverage
1988 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1988 | 151 | 41% | No |
| 1989 | 361 | 99% | Yes |
| 1990 | 358 | 98% | Yes |
| 1991 | 362 | 99% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 344 | 94% | Yes |
| 1994 | 352 | 96% | Yes |
| 1995 | 268 | 73% | No |
| 1996 | 92 | 25% | No |
| 1997 | 361 | 99% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 362 | 99% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 365 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 363 | 99% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 265 | 73% | No |
| 2026 | 83 | 23% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 7 October 2026 | Grassy Lake, US | daily high max (Provisional) | 21.3 C (70.3 F) | 0.2 C (0.4 F) | 5 years | 4 of 100 (Routine) |
| 6 October 2026 | Grassy Lake, US | daily high max (Provisional) | 21.4 C (70.5 F) | 1.9 C (3.4 F) | 23 years | 11 of 100 (Routine) |
| 5 October 2026 | Grassy Lake, US | daily high max (Provisional) | 23.0 C (73.4 F) | 2.5 C (4.5 F) | 23 years | 12 of 100 (Routine) |
| 4 October 2026 | Grassy Lake, US | daily high max (Tie, Provisional) | 22.2 C (72.0 F) | tie | 1 year | 0 of 100 (Routine) |
| 17 September 2026 | Grassy Lake, US | daily high min (Provisional) | 6.2 C (43.2 F) | 0.1 C (0.2 F) | 12 years | 6 of 100 (Routine) |
| 11 September 2026 | Grassy Lake, US | daily high min (Provisional) | 7.9 C (46.2 F) | 2.1 C (3.8 F) | 12 years | 12 of 100 (Routine) |
| 28 August 2026 | Grassy Lake, US | daily high min (Provisional) | 10.4 C (50.7 F) | 2.2 C (4.0 F) | 15 years | 13 of 100 (Routine) |
| 22 August 2026 | Grassy Lake, US | daily high min (Provisional) | 10.2 C (50.4 F) | 0.4 C (0.7 F) | 23 years | 10 of 100 (Routine) |
| 21 August 2026 | Grassy Lake, US | daily high max (Provisional) | 30.5 C (86.9 F) | 1.4 C (2.5 F) | 16 years | 11 of 100 (Routine) |
| 14 August 2026 | Grassy Lake, US | daily rain (Tie) | 10.2 mm (0.4 in) | tie | 8 years | 1 of 100 (Routine) |
| 29 June 2026 | Grassy Lake, US | daily rain | 35.6 mm (1.4 in) | 25.4 mm (1.0 in) | 5 years | 36 of 100 (Notable) |
| 27 June 2026 | Grassy Lake, US | daily rain | 30.5 mm (1.2 in) | 15.3 mm (0.6 in) | 8 years | 25 of 100 (Routine) |
| 9 June 2026 | Grassy Lake, US | daily rain | 17.8 mm (0.7 in) | 5.1 mm (0.20 in) | 24 years | 17 of 100 (Routine) |
| 22 April 2026 | Grassy Lake, US | daily rain | 25.4 mm (1.0 in) | 5.1 mm (0.20 in) | 33 years | 21 of 100 (Routine) |
| 16 April 2026 | Grassy Lake, US | daily rain (Tie) | 20.3 mm (0.8 in) | tie | 20 years | 2 of 100 (Routine) |
| 20 February 2026 | Grassy Lake, US | daily low min | -29.5 C (-21.1 F) | 1.6 C (2.9 F) | 6 years | 6 of 100 (Routine) |
| 18 February 2026 | Grassy Lake, US | daily rain (Tie) | 17.8 mm (0.7 in) | tie | 36 years | 3 of 100 (Routine) |
| 12 February 2026 | Grassy Lake, US | daily high min | -3.2 C (26.2 F) | 1.2 C (2.2 F) | 10 years | 7 of 100 (Routine) |
| 6 February 2026 | Grassy Lake, US | daily high max | 10.5 C (50.9 F) | 0.8 C (1.4 F) | 19 years | 9 of 100 (Routine) |
| 5 February 2026 | Grassy Lake, US | daily high max | 10.4 C (50.7 F) | 4.7 C (8.5 F) | 35 years | 23 of 100 (Routine) |
Climate Trend
34 complete years, 1989 to 2024| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1989 | 0.8 C | -0.52 C |
| 1990 | 1.0 C | -0.33 C |
| 1991 | 0.8 C | -0.58 C |
| 1992 | 1.7 C | +0.30 C |
| 1993 | -0.2 C | -1.51 C |
| 1994 | 1.5 C | +0.18 C |
| 1997 | 0.8 C | -0.54 C |
| 1998 | 2.1 C | +0.76 C |
| 1999 | 1.5 C | +0.19 C |
| 2000 | 1.2 C | -0.20 C |
| 2001 | 1.4 C | +0.08 C |
| 2002 | 0.5 C | -0.86 C |
| 2003 | 1.8 C | +0.49 C |
| 2004 | 1.4 C | +0.03 C |
| 2005 | 1.3 C | -0.05 C |
| 2006 | 1.5 C | +0.16 C |
| 2007 | 2.4 C | +1.05 C |
| 2008 | 0.4 C | -0.93 C |
| 2009 | 0.7 C | -0.62 C |
| 2010 | 1.1 C | -0.27 C |
| 2011 | 0.5 C | -0.89 C |
| 2012 | 2.1 C | +0.79 C |
| 2013 | 1.0 C | -0.32 C |
| 2014 | 1.6 C | +0.26 C |
| 2015 | 2.3 C | +0.99 C |
| 2016 | 2.1 C | +0.76 C |
| 2017 | 1.9 C | +0.51 C |
| 2018 | 1.6 C | +0.26 C |
| 2019 | 0.8 C | -0.52 C |
| 2020 | 1.3 C | -0.05 C |
| 2021 | 2.2 C | +0.83 C |
| 2022 | 0.9 C | -0.44 C |
| 2023 | 1.4 C | 0.00 C |
| 2024 | 2.5 C | +1.12 C |
The annual mean temperature here has risen by 0.21 C (0.00 to 0.41) per decade over 1989 to 2024. In Fahrenheit: 0.38 F (0.01 to 0.75) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.21 C (0.00 to 0.41) per decade | 0.38 F (0.01 to 0.75) per decade | 1989 to 2024 | 34 | Rise |
| Mean daily maximum | 0.25 C (0.02 to 0.48) per decade | 0.45 F (0.03 to 0.86) per decade | 1989 to 2024 | 34 | Rise |
| Mean daily minimum | 0.17 C (-0.04 to 0.39) per decade | 0.3 F (-0.1 to 0.7) per decade | 1989 to 2024 | 34 | 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
1979 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 34.6 C (94.3 F) | 2007 | 30.5 C (86.9 F) | 39 |
| Coldest night (TNn) | -37.0 C (-34.6 F) | 2025 | -31.2 C (-24.2 F) | 39 |
| Wettest day (Rx1day) | 81.3 mm (3.2 in) | 2012 | 40.6 mm (1.6 in) | 48 |
| Wettest five days (Rx5day) | 200.7 mm (7.9 in) | 1996 | 96.5 mm (3.8 in) | 47 |
| Longest dry spell (CDD) | 72 days | 1988 | 20 days | 48 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | 29.9 C (85.8 F) |
| 1989 | 30.9 C (87.6 F) |
| 1990 | 30.8 C (87.4 F) |
| 1991 | 29.1 C (84.4 F) |
| 1992 | 29.1 C (84.4 F) |
| 1993 | 25.4 C (77.7 F) |
| 1994 | 30.8 C (87.4 F) |
| 1995 | 28.4 C (83.1 F) |
| 1996 | 21.4 C (70.5 F) |
| 1997 | 27.6 C (81.7 F) |
| 1998 | 29.7 C (85.5 F) |
| 1999 | 29.2 C (84.6 F) |
| 2000 | 31.6 C (88.9 F) |
| 2001 | 30.8 C (87.4 F) |
| 2002 | 33.2 C (91.8 F) |
| 2003 | 34.1 C (93.4 F) |
| 2004 | 29.4 C (84.9 F) |
| 2005 | 30.6 C (87.1 F) |
| 2006 | 32.6 C (90.7 F) |
| 2007 | 34.6 C (94.3 F) |
| 2008 | 29.8 C (85.6 F) |
| 2009 | 29.9 C (85.8 F) |
| 2010 | 28.8 C (83.8 F) |
| 2011 | 29.1 C (84.4 F) |
| 2012 | 30.1 C (86.2 F) |
| 2013 | 31.1 C (88.0 F) |
| 2014 | 28.6 C (83.5 F) |
| 2015 | 30.8 C (87.4 F) |
| 2016 | 30.1 C (86.2 F) |
| 2017 | 31.1 C (88.0 F) |
| 2018 | 32.8 C (91.0 F) |
| 2019 | 29.5 C (85.1 F) |
| 2020 | 31.2 C (88.2 F) |
| 2021 | 32.4 C (90.3 F) |
| 2022 | 31.0 C (87.8 F) |
| 2023 | 31.3 C (88.3 F) |
| 2024 | 32.3 C (90.1 F) |
| 2025 | 30.1 C (86.2 F) |
| 2026 | 30.5 C (86.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | -26.8 C (-16.2 F) |
| 1989 | -32.8 C (-27.0 F) |
| 1990 | -33.2 C (-27.8 F) |
| 1991 | -34.0 C (-29.2 F) |
| 1992 | -29.1 C (-20.4 F) |
| 1993 | -31.2 C (-24.2 F) |
| 1994 | -29.9 C (-21.8 F) |
| 1995 | -29.8 C (-21.6 F) |
| 1996 | -29.5 C (-21.1 F) |
| 1997 | -29.0 C (-20.2 F) |
| 1998 | -34.7 C (-30.5 F) |
| 1999 | -27.9 C (-18.2 F) |
| 2000 | -28.4 C (-19.1 F) |
| 2001 | -32.8 C (-27.0 F) |
| 2002 | -35.4 C (-31.7 F) |
| 2003 | -31.3 C (-24.3 F) |
| 2004 | -32.6 C (-26.7 F) |
| 2005 | -35.0 C (-31.0 F) |
| 2006 | -30.3 C (-22.5 F) |
| 2007 | -34.1 C (-29.4 F) |
| 2008 | -31.4 C (-24.5 F) |
| 2009 | -34.9 C (-30.8 F) |
| 2010 | -29.5 C (-21.1 F) |
| 2011 | -35.3 C (-31.5 F) |
| 2012 | -28.5 C (-19.3 F) |
| 2013 | -33.4 C (-28.1 F) |
| 2014 | -30.6 C (-23.1 F) |
| 2015 | -30.3 C (-22.5 F) |
| 2016 | -31.9 C (-25.4 F) |
| 2017 | -31.2 C (-24.2 F) |
| 2018 | -29.1 C (-20.4 F) |
| 2019 | -29.0 C (-20.2 F) |
| 2020 | -29.1 C (-20.4 F) |
| 2021 | -30.1 C (-22.2 F) |
| 2022 | -36.6 C (-33.9 F) |
| 2023 | -36.6 C (-33.9 F) |
| 2024 | -31.7 C (-25.1 F) |
| 2025 | -37.0 C (-34.6 F) |
| 2026 | -29.5 C (-21.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1979 | 20.3 mm (0.8 in) |
| 1980 | 38.1 mm (1.5 in) |
| 1981 | 53.3 mm (2.1 in) |
| 1982 | 40.6 mm (1.6 in) |
| 1983 | 40.6 mm (1.6 in) |
| 1984 | 55.9 mm (2.2 in) |
| 1985 | 35.6 mm (1.4 in) |
| 1986 | 40.6 mm (1.6 in) |
| 1987 | 35.6 mm (1.4 in) |
| 1988 | 38.1 mm (1.5 in) |
| 1989 | 38.1 mm (1.5 in) |
| 1990 | 38.1 mm (1.5 in) |
| 1991 | 33.0 mm (1.3 in) |
| 1992 | 38.1 mm (1.5 in) |
| 1993 | 33.0 mm (1.3 in) |
| 1994 | 43.2 mm (1.7 in) |
| 1995 | 40.6 mm (1.6 in) |
| 1996 | 55.9 mm (2.2 in) |
| 1997 | 55.9 mm (2.2 in) |
| 1998 | 43.2 mm (1.7 in) |
| 1999 | 40.6 mm (1.6 in) |
| 2000 | 40.6 mm (1.6 in) |
| 2001 | 35.6 mm (1.4 in) |
| 2002 | 45.7 mm (1.8 in) |
| 2003 | 45.7 mm (1.8 in) |
| 2004 | 35.6 mm (1.4 in) |
| 2005 | 35.6 mm (1.4 in) |
| 2006 | 33.0 mm (1.3 in) |
| 2007 | 63.5 mm (2.5 in) |
| 2008 | 33.0 mm (1.3 in) |
| 2009 | 25.4 mm (1.0 in) |
| 2010 | 48.3 mm (1.9 in) |
| 2011 | 43.2 mm (1.7 in) |
| 2012 | 81.3 mm (3.2 in) |
| 2013 | 43.2 mm (1.7 in) |
| 2014 | 50.8 mm (2.0 in) |
| 2015 | 68.6 mm (2.7 in) |
| 2016 | 61.0 mm (2.4 in) |
| 2017 | 55.9 mm (2.2 in) |
| 2018 | 40.6 mm (1.6 in) |
| 2019 | 45.7 mm (1.8 in) |
| 2020 | 53.3 mm (2.1 in) |
| 2021 | 30.5 mm (1.2 in) |
| 2022 | 40.6 mm (1.6 in) |
| 2023 | 58.4 mm (2.3 in) |
| 2024 | 45.7 mm (1.8 in) |
| 2025 | 63.5 mm (2.5 in) |
| 2026 | 35.6 mm (1.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1979 | n/a |
| 1980 | 96.6 mm (3.8 in) |
| 1981 | 104.1 mm (4.1 in) |
| 1982 | 119.4 mm (4.7 in) |
| 1983 | 101.5 mm (4.0 in) |
| 1984 | 101.6 mm (4.0 in) |
| 1985 | 81.4 mm (3.2 in) |
| 1986 | 149.8 mm (5.9 in) |
| 1987 | 76.2 mm (3.0 in) |
| 1988 | 83.8 mm (3.3 in) |
| 1989 | 86.4 mm (3.4 in) |
| 1990 | 104.1 mm (4.1 in) |
| 1991 | 83.8 mm (3.3 in) |
| 1992 | 78.7 mm (3.1 in) |
| 1993 | 94.0 mm (3.7 in) |
| 1994 | 106.7 mm (4.2 in) |
| 1995 | 91.5 mm (3.6 in) |
| 1996 | 200.7 mm (7.9 in) |
| 1997 | 175.3 mm (6.9 in) |
| 1998 | 122.0 mm (4.8 in) |
| 1999 | 101.5 mm (4.0 in) |
| 2000 | 96.5 mm (3.8 in) |
| 2001 | 63.5 mm (2.5 in) |
| 2002 | 88.8 mm (3.5 in) |
| 2003 | 94.0 mm (3.7 in) |
| 2004 | 91.5 mm (3.6 in) |
| 2005 | 91.5 mm (3.6 in) |
| 2006 | 88.8 mm (3.5 in) |
| 2007 | 106.7 mm (4.2 in) |
| 2008 | 88.9 mm (3.5 in) |
| 2009 | 71.1 mm (2.8 in) |
| 2010 | 124.5 mm (4.9 in) |
| 2011 | 104.1 mm (4.1 in) |
| 2012 | 165.1 mm (6.5 in) |
| 2013 | 68.6 mm (2.7 in) |
| 2014 | 106.7 mm (4.2 in) |
| 2015 | 106.7 mm (4.2 in) |
| 2016 | 96.5 mm (3.8 in) |
| 2017 | 142.2 mm (5.6 in) |
| 2018 | 86.4 mm (3.4 in) |
| 2019 | 119.3 mm (4.7 in) |
| 2020 | 83.7 mm (3.3 in) |
| 2021 | 86.4 mm (3.4 in) |
| 2022 | 86.3 mm (3.4 in) |
| 2023 | 114.3 mm (4.5 in) |
| 2024 | 101.6 mm (4.0 in) |
| 2025 | 142.2 mm (5.6 in) |
| 2026 | 71.1 mm (2.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1979 | 1 day |
| 1980 | 12 days |
| 1981 | 39 days |
| 1982 | 15 days |
| 1983 | 16 days |
| 1984 | 19 days |
| 1985 | 19 days |
| 1986 | 31 days |
| 1987 | 48 days |
| 1988 | 72 days |
| 1989 | 19 days |
| 1990 | 19 days |
| 1991 | 33 days |
| 1992 | 21 days |
| 1993 | 20 days |
| 1994 | 31 days |
| 1995 | 14 days |
| 1996 | 17 days |
| 1997 | 14 days |
| 1998 | 27 days |
| 1999 | 19 days |
| 2000 | 39 days |
| 2001 | 24 days |
| 2002 | 26 days |
| 2003 | 33 days |
| 2004 | 27 days |
| 2005 | 23 days |
| 2006 | 20 days |
| 2007 | 11 days |
| 2008 | 25 days |
| 2009 | 14 days |
| 2010 | 19 days |
| 2011 | 19 days |
| 2012 | 25 days |
| 2013 | 22 days |
| 2014 | 27 days |
| 2015 | 19 days |
| 2016 | 28 days |
| 2017 | 20 days |
| 2018 | 53 days |
| 2019 | 14 days |
| 2020 | 28 days |
| 2021 | 14 days |
| 2022 | 13 days |
| 2023 | 32 days |
| 2024 | 18 days |
| 2025 | 31 days |
| 2026 | 17 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
34 years with a frostAcross 34 years with a frost, the median last spring frost at Grassy Lake falls on 26 June and the median first autumn frost on 9 July, which leaves a median of 15 days between them.
Fitted over all years, the growing season changes by +4.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1993 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 26 June | n/a | 26 June | n/a | -0.5 days per decade |
| First autumn frost | 9 July | n/a | 11 July | n/a | +3.7 days per decade |
| Growing days | 15 days | n/a | 17 days | n/a | +4.2 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, 1981 to 2025A day with at least 42.7 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 84.6 mm (3.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 42.7 mm (1.7 in) | |
| 5 years | 52.7 mm (2.1 in) | |
| 10 years | 59.8 mm (2.4 in) | |
| 25 years | 69.3 mm (2.7 in) | |
| 50 years | 76.8 mm (3.0 in) | Longer than the 45 years of record |
| 100 years | 84.6 mm (3.3 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 1981 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: 81.3 mm (3.2 in) in 2012; 68.6 mm (2.7 in) in 2015; 63.5 mm (2.5 in) in 2007.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).