All-time weather records — Round Lake Heights, IL
Climate change signal in Round Lake Heights
of Round Lake Heights's all-time daily heat records were set in the last decade (0 of 366 records since 2015).
of all-time daily cold records were set in the last decade (0 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 | # |
|---|---|---|---|---|
| 1980s | 75 | 73 | ||
| 1990s | 179 | 226 | ||
| 2000s | 112 | 67 |
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 1987, the latest in 2005. Period of observation: 1985-2005.
Records by month
| Month | Hottest day | Coldest day | Wettest day |
|---|---|---|---|
| January | 62.1°F — Jan 31, 1989 | -26.0°F — Jan 18, 1994 | 1.45 in — Jan 25, 1990 |
| February | 69.1°F — Feb 25, 2000 | -24.0°F — Feb 3, 1996 | 1.70 in — Feb 21, 1997 |
| March | 78.1°F — Mar 29, 1998 | -7.1°F — Mar 4, 2002 | 2.01 in — Mar 31, 1993 |
| April | 87.1°F — Apr 15, 2002 | 16.0°F — Apr 5, 1995 | 2.29 in — Apr 19, 1993 |
| May | 90.0°F — May 18, 1996 | 28.0°F — May 6, 1989 | 2.15 in — May 25, 1991 |
| June | 100.9°F — Jun 25, 1988 | 37.0°F — Jun 1, 2003 | 3.18 in — Jun 27, 1986 |
| July | 102.0°F — Jul 13, 1995 | 46.0°F — Jul 2, 2001 | 2.45 in — Jul 17, 1996 |
| August | 100.0°F — Aug 1, 1988 | 48.0°F — Aug 6, 1994 | 3.97 in — Aug 14, 1987 |
| September | 93.0°F — Sep 6, 1990 | 32.0°F — Sep 23, 1995 | 3.46 in — Sep 22, 1986 |
| October | 84.9°F — Oct 4, 2005 | 19.9°F — Oct 30, 1988 | 2.81 in — Oct 4, 1991 |
| November | 73.9°F — Nov 3, 1987 | 5.0°F — Nov 23, 1989 | 1.80 in — Nov 2, 2003 |
| December | 66.9°F — Dec 5, 2001 | -18.0°F — Dec 21, 1989 | 1.52 in — Dec 28, 1987 |
Click a month to see every daily record for that month in Round Lake Heights.