All-time weather records — Alton, IN
Climate change signal in Alton
of Alton's all-time daily heat records were set in the last decade (209 of 364 records since 2015).
of all-time daily cold records were set in the last decade (178 of 362 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 | # |
|---|---|---|---|---|
| 2010s | 340 | 343 | ||
| 2020s | 24 | 19 |
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 2012, the latest in 2020. Period of observation: 2012-2020.
Records by month
| Month | Hottest day | Coldest day | Wettest day |
|---|---|---|---|
| January | 66.9°F — Jan 13, 2017 | -7.1°F — Jan 7, 2014 | 1.88 in — Jan 12, 2020 |
| February | 78.1°F — Feb 21, 2018 | -11.9°F — Feb 20, 2015 | 2.74 in — Feb 25, 2018 |
| March | 82.0°F — Mar 16, 2016 | 0.0°F — Mar 6, 2015 | 1.92 in — Mar 18, 2013 |
| April | 84.9°F — Apr 4, 2012 | — | 6.20 in — Apr 3, 2015 |
| May | 91.0°F — May 29, 2012 | 28.9°F — May 9, 2020 | 1.91 in — May 27, 2019 |
| June | 95.0°F — Jun 26, 2016 | 52.0°F — Jun 7, 2012 | 2.52 in — Jun 17, 2019 |
| July | 102.9°F — Jul 8, 2012 | 52.0°F — Jul 17, 2014 | 4.49 in — Jul 2, 2015 |
| August | 93.9°F — Aug 29, 2016 | 54.0°F — Aug 27, 2015 | 2.96 in — Aug 16, 2018 |
| September | 93.0°F — Sep 11, 2013 | 37.0°F — Sep 23, 2012 | 6.88 in — Sep 9, 2018 |
| October | 87.1°F — Oct 3, 2014 | — | 4.99 in — Oct 6, 2013 |
| November | 75.9°F — Nov 19, 2016 | — | 3.12 in — Nov 1, 2018 |
| December | 71.1°F — Dec 4, 2012 | — | 2.18 in — Dec 22, 2013 |
Click a month to see every daily record for that month in Alton.