All-time weather records — Ontario, WI
Record high
°F
January 1,
Record low
°F
January 1,
Wettest day
9.66 in
August 28, 2018
Records by month
| Month | Hottest day | Coldest day | Wettest day |
|---|---|---|---|
| January | — | — | 2.06 in — Jan 9, 2026 |
| February | — | — | 1.05 in — Feb 24, 2007 |
| March | — | — | 1.80 in — Mar 30, 1998 |
| April | — | — | 3.00 in — Apr 24, 1994 |
| May | — | — | 4.10 in — May 30, 1979 |
| June | — | — | 6.10 in — Jun 8, 2008 |
| July | — | — | 6.00 in — Jul 1, 1978 |
| August | — | — | 9.66 in — Aug 28, 2018 |
| September | — | — | 3.74 in — Sep 19, 2019 |
| October | — | — | 2.35 in — Oct 12, 1997 |
| November | — | — | 2.75 in — Nov 11, 1982 |
| December | — | — | 2.52 in — Dec 13, 2015 |
Click a month to see every daily record for that month in Ontario.