Afton - Janesville Wwtp Threshold Days by Year (USC00470045)
17 fixed thresholds counted per year at Afton - Janesville Wwtp (USC00470045): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Afton - Janesville Wwtp Thresholds
- Afton - Janesville Wwtp: days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 2019 with 45.
- Afton - Janesville Wwtp: days with 25 mm (0.98 in) or more of precipitation in 39 years, most in 2001 with 15.
- Afton - Janesville Wwtp: days with a maximum temperature at or above 30 C (86 F) in 38 years, most in 2012 with 66.
- Afton - Janesville Wwtp: days with a maximum temperature at or above 90 F (32.2 C) in 38 years, most in 2012 with 45.
- 17 fixed thresholds have at least one qualifying day at Afton - Janesville Wwtp.
Days at or above 30 C (86 F)
38 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1988 | 61 | 46 |
| 1989 | 31 | 46 |
| 1990 | 14 | 31.6 |
| 1991 | 53 | 31.6 |
| 1992 | 17 | 31.6 |
| 1993 | 18 | 31.6 |
| 1994 | 25 | 31.6 |
| 1995 | 52 | 31.6 |
| 1996 | 30 | 31.6 |
| 1997 | 31 | 31.6 |
| 1998 | 36 | 31.6 |
| 1999 | 40 | 31.6 |
| 2000 | 22 | 29.1 |
| 2001 | 40 | 29.1 |
| 2003 | 39 | 29.1 |
| 2004 | 13 | 29.1 |
| 2005 | 54 | 29.1 |
| 2006 | 27 | 29.1 |
| 2007 | 43 | 29.1 |
| 2008 | 15 | 29.1 |
| 2009 | 9 | 29.1 |
| 2010 | 44 | 36.5 |
| 2011 | 45 | 36.5 |
| 2012 | 66 | 36.5 |
| 2013 | 29 | 36.5 |
| 2014 | 16 | 36.5 |
| 2015 | 21 | 36.5 |
| 2016 | 43 | 36.5 |
| 2017 | 34 | 36.5 |
| 2018 | 41 | 36.5 |
| 2019 | 26 | 36.5 |
| 2020 | 38 | 37.9 |
| 2021 | 50 | 37.9 |
| 2022 | 32 | 37.9 |
| 2023 | 34 | 37.9 |
| 2024 | 38 | 37.9 |
| 2025 | 40 | 37.9 |
| 2026 | 33 | 37.9 |
| Year | First date | Last date |
|---|---|---|
| 1988 | 1988-05-28 | 1988-09-17 |
| 1989 | 1989-05-24 | 1989-08-23 |
| 1990 | 1990-06-12 | 1990-09-06 |
| 1991 | 1991-05-12 | 1991-09-16 |
| 1992 | 1992-05-02 | 1992-08-26 |
| 1993 | 1993-05-11 | 1993-08-31 |
| 1994 | 1994-05-23 | 1994-09-16 |
| 1995 | 1995-06-08 | 1995-09-06 |
| 1996 | 1996-05-18 | 1996-09-07 |
| 1997 | 1997-06-14 | 1997-10-08 |
| 1998 | 1998-05-15 | 1998-09-27 |
| 1999 | 1999-05-29 | 1999-09-06 |
| 2000 | 2000-06-09 | 2000-09-19 |
| 2001 | 2001-05-16 | 2001-09-04 |
| 2003 | 2003-04-16 | 2003-09-12 |
| 2004 | 2004-05-10 | 2004-09-16 |
| 2005 | 2005-06-07 | 2005-10-05 |
| 2006 | 2006-05-28 | 2006-08-24 |
| 2007 | 2007-05-15 | 2007-10-08 |
| 2008 | 2008-06-08 | 2008-09-03 |
| 2009 | 2009-06-21 | 2009-08-16 |
| 2010 | 2010-05-24 | 2010-10-10 |
| 2011 | 2011-05-11 | 2011-09-03 |
| 2012 | 2012-05-16 | 2012-09-13 |
| 2013 | 2013-05-01 | 2013-09-20 |
| 2014 | 2014-05-09 | 2014-08-26 |
| 2015 | 2015-06-10 | 2015-09-05 |
| 2016 | 2016-06-11 | 2016-09-26 |
| 2017 | 2017-05-17 | 2017-09-27 |
| 2018 | 2018-05-25 | 2018-09-21 |
| 2019 | 2019-06-27 | 2019-08-06 |
| 2020 | 2020-05-27 | 2020-08-29 |
| 2021 | 2021-05-02 | 2021-10-02 |
| 2022 | 2022-05-11 | 2022-09-21 |
| 2023 | 2023-05-31 | 2023-10-02 |
| 2024 | 2024-05-19 | 2024-09-22 |
| 2025 | 2025-05-16 | 2025-10-05 |
| 2026 | 2026-05-26 | 2026-10-13 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 38 | 66 | 2012 | 33 |
| 35 C (95 F): Days | 25 | 17 | 1988 | 3 |
| 90 F (32.2 C): Days | 38 | 45 | 2012 | 17 |
| 100 F (37.8 C): Days | 3 | 7 | 1988 | 3 |
| 0 C (32 F): Ice days (max | 38 | 83 | 2014 | 33 |
| 0 C (32 F): Frost days (min | 36 | 171 | 1996 | 86 |
| -10 C (14 F): Days with min | 36 | 79 | 2014 | 31 |
| -20 C (-4 F): Days with min | 36 | 32 | 2014 | 10 |
| -30 C (-22 F): Days with min | 6 | 7 | 1994 | 3 |
| 20 C (68 F): Tropical nights (min | 36 | 22 | 2025 | 22 |
| 25 C (77 F): Days with min | 5 | 2 | 2006 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 39 | 45 | 2019 | 35 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 39 | 15 | 2001 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 33 | 4 | 2007 | 3 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 2007 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 30 | 9 | 2008 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 1 | 1994 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1988.
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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-17).