All-time weather records — Sumner, IL
Climate change signal in Sumner
of Sumner's all-time daily heat records were set in the last decade (85 of 366 records since 2015).
of all-time daily cold records were set in the last decade (107 of 366 records since 2015).
If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:
| Decade | Heat records set | # | Cold records set | # |
|---|---|---|---|---|
| 1960s | 23 | 20 | ||
| 1970s | · | · | ||
| 1980s | · | · | ||
| 1990s | 93 | 137 | ||
| 2000s | 94 | 83 | ||
| 2010s | 115 | 57 | ||
| 2020s | 41 | 69 |
Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1963, the latest in 2026. Period of observation: 1962-2026.
Records by month
| Month | Hottest day | Coldest day | Wettest day |
|---|---|---|---|
| January | 68.0°F — Jan 9, 2026 | -18.9°F — Jan 19, 1994 | 2.56 in — Jan 31, 1982 |
| February | 75.9°F — Feb 21, 2018 | -11.0°F — Feb 4, 1996 | 2.80 in — Feb 10, 1965 |
| March | 86.0°F — Mar 23, 2026 | 6.1°F — Mar 1, 1993 | 3.86 in — Mar 30, 1989 |
| April | 87.1°F — Apr 16, 2024 | 21.9°F — Apr 2, 2021 | 4.55 in — Apr 5, 2025 |
| May | 95.0°F — May 28, 2012 | 32.0°F — May 1, 1963 | 4.32 in — May 18, 1995 |
| June | 107.1°F — Jun 29, 2012 | 41.0°F — Jun 1, 2003 | 4.05 in — Jun 18, 2011 |
| July | 106.0°F — Jul 8, 2012 | 50.0°F — Jul 28, 2013 | 4.13 in — Jul 31, 2020 |
| August | 102.9°F — Aug 9, 2007 | 46.0°F — Aug 28, 2025 | 4.37 in — Aug 5, 2025 |
| September | 99.0°F — Sep 4, 2011 | 34.0°F — Sep 24, 1995 | 4.27 in — Sep 9, 2018 |
| October | 95.0°F — Oct 1, 2019 | 21.0°F — Oct 31, 2023 | 3.70 in — Oct 20, 1985 |
| November | 82.0°F — Nov 2, 2000 | 14.0°F — Nov 17, 1997 | 2.81 in — Nov 25, 2010 |
| December | 78.1°F — Dec 14, 1996 | -8.0°F — Dec 24, 2022 | 3.00 in — Dec 25, 1982 |
Click a month to see every daily record for that month in Sumner.