Dangerous, prolonged heat is expected across portions of the Central and Southeast U.S. through July. Scattered severe thunderstorms are expected over parts of the northern Plains into the upper Mississippi Valley Tuesday, with damaging winds and large hail as the primary threats. Heavy rainfall could lead to areas of flooding across the northern Plains, Upper Midwest, Southeast and Southwest. 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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