| 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 | 51.3 |
| 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 | 6.6 |
| 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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