Heavy to excessive rainfall over the southern Appalachians and portions of the central Gulf Coast may bring areas of flooding today. Hot temperatures are in place through today across much of the western U.S. and New England. Tropical Storm Erin is forecast to become a Major Hurricane this weekend as it moves across the central Atlantic Ocean. Monitor future forecasts for any East Coast impacts. 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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