Due to the potential for severe thunderstorms on Tuesday, March 10th, the Beyond the Warning seminar in Oglesby, IL has been POSTPONED. We intend to reschedule this session later this spring. Read More >
| Chicago Monthly and Yearly Normals (1991-2020) | |||||||||||||
| JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL | |
| HIGH | 31.6 | 35.7 | 47.0 | 59.0 | 70.5 | 80.4 | 84.5 | 82.5 | 75.5 | 62.7 | 48.4 | 36.6 | 59.5 |
| LOW | 18.8 | 21.8 | 31.0 | 40.3 | 50.6 | 60.8 | 66.4 | 65.1 | 57.1 | 45.4 | 34.1 | 24.4 | 43.0 |
| AVERAGE | 25.2 | 28.8 | 39.0 | 49.7 | 60.6 | 70.6 | 75.4 | 73.8 | 66.3 | 54.0 | 41.3 | 30.5 | 51.2 |
| HEATING DEGREE DAYS | 1234 | 1015 | 808 | 468 | 198 | 31 | 2 | 4 | 77 | 355 | 713 | 1069 | 5974 |
| COOLING DEGREE DAYS | 0 | 0 | 2 | 8 | 60 | 199 | 326 | 276 | 116 | 15 | 0 | 0 | 1003 |
| PRECIPITATION | 1.99 | 1.97 | 2.45 | 3.75 | 4.49 | 4.10 | 3.71 | 4.25 | 3.19 | 3.43 | 2.42 | 2.11 | 37.86 |
| SNOWFALL | 11.3 | 10.7 | 5.5 | 1.3 | T | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 1.8 | 7.6 | 38.4 |
| Chicago Mean Number of Days (1991-2020) | |||||||||||||
| Temperatures | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL |
| HIGHS >=90 | - | - | - | - | 0.8 | 4.1 | 6.5 | 3.7 | 1.6 | - | - | - | 16.7 |
| HIGHS >=50 | 1.6 | 3.2 | 11.5 | 23.4 | 30.3 | 30.0 | 31.0 | 31.0 | 30.0 | 27.8 | 12.9 | 3.4 | 236.1 |
| HIGHS <=32 | 16.5 | 11.2 | 3.0 | 0.1 | - | - | - | - | - | - | 2.2 | 10.4 | 43.4 |
| LOWS <=32 | 28.1 | 24.4 | 19.9 | 6.0 | 0.2 | - | - | - | 0.1 | 2.7 | 14.5 | 25.4 | 121.3 |
| LOWS <=0 | 3.5 | 1.8 | 0.2 | - | - | - | - | - | - | - | - | 1.1 | 6.5 |
| Rockford Monthly and Yearly Normals (1991-2020) | |||||||||||||
| JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL | |
| HIGH | 29.1 | 33.4 | 46.5 | 59.7 | 71.2 | 80.7 | 83.9 | 82.0 | 75.3 | 62.3 | 47.1 | 34.3 | 58.8 |
| LOW | 14.5 | 17.8 | 28.1 | 38.5 | 49.5 | 59.6 | 63.6 | 61.8 | 53.5 | 41.8 | 30.5 | 20.2 | 40.0 |
| AVERAGE | 21.8 | 25.6 | 37.3 | 49.1 | 60.4 | 70.1 | 73.8 | 71.9 | 64.4 | 52.0 | 38.8 | 27.3 | 49.4 |
| HEATING DEGREE DAYS | 1339 | 1003 | 860 | 482 | 199 | 27 | 3 | 8 | 107 | 412 | 786 | 1170 | 6497 |
| COOLING DEGREE DAYS | 0 | 0 | 2 | 5 | 54 | 182 | 274 | 222 | 89 | 11 | 0 | 0 | 838 |
| PRECIPITATION | 1.60 | 1.63 | 2.40 | 3.75 | 4.18 | 5.23 | 3.81 | 4.19 | 3.62 | 2.63 | 2.27 | 1.93 | 37.24 |
| SNOWFALL | 10.9 | 8.5 | 4.9 | 0.9 | T | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 2.3 | 9.4 | 37.1 |
| Rockford Mean Number of Days (1991-2020) | |||||||||||||
| Temperatures | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANNUAL |
| HIGHS >=90 | - | - | - | - | 0.7 | 3.9 | 5.4 | 3.2 | 1.5 | 0.1 | - | - | 14.8 |
| HIGHS >=50 | 1.3 | 2.1 | 11.7 | 24.4 | 30.7 | 30.0 | 31.0 | 31.0 | 30.0 | 27.3 | 12.1 | 2.5 | 234.1 |
| HIGHS <=32 | 18.5 | 12.6 | 3.7 | 0.1 | - | - | - | - | - | - | 2.8 | 12.3 | 50.0 |
| LOWS <=32 | 29.2 | 25.8 | 21.9 | 7.4 | 0.6 | - | - | - | 0.3 | 5.3 | 18.0 | 27.3 | 135.8 |
| LOWS <=0 | 5.6 | 3.1 | 0.4 | - | - | - | - | - | - | - | - | 2.4 | 11.5 |
Click here for the old 1981 to 2010 Normals for Chicago and Rockford
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