Chicago Monthly and Yearly Normals (1981-2010)
  JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
HIGH 31.0 35.3. 46.6 59.0 70.0 79.7 84.1 81.9 74.8 62.3 48.2 34.8 59.1
LOW 16.5 20.1 29.2 38.8 48.3 58.1 63.9 62.9 54.3 42.8 32.4 20.7 40.8
AVERAGE 23.8 27.7 37.9 48.9 59.1 68.9 74.0 72.4 64.6 52.5 40.3 27.7 49.9
HEATING DEGREE DAYS 1279 1044 841 492 225 48 4 9 105 397 741 1155 6339
COOLING DEGREE DAYS 0 0 0 9 44 165 283 238 92 11 0 0 842
PRECIPITATION 1.73 1.79 2.50 3.38 3.68 3.45 3.70 4.90 3.21 3.15 3.15 2.25 36.89
SNOWFALL 10.8 9.1 5.6 1.2 T 0.0 0.0 0.0 0.0 0.3 1.2 8.5 36.7

 

Rockford Monthly and Yearly Normals (1981-2010)
  JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL
HIGH 29.5 34.2 46.9 60.7 71.8 81.1 84.5 82.4 75.4 62.7 47.6 33.2 59.3
LOW 13.5 17.7 27.5 38.1 48.4 58.5 63.0 61.3 52.4 40.7 30.3 17.7 39.2
AVERAGE 21.5 25.9 37.2 49.4 60.1 69.8 73.8 71.9 63.9 51.7 38.9 25.4 49.2
HEATING DEGREE DAYS 1348 1093 862 476 198 31 3 11 117 422 782 1226 6569
COOLING DEGREE DAYS 0 0 0 8 47 175 274 223 84 9 0 0 820
PRECIPITATION 1.37 1.41 2.32 3.35 4.02 4.65 3.95 4.59 3.35 2.67 2.58 1.98 36.24
SNOWFALL 10.2 7.7 4.8 0.9 T 0.0 0.0 0.0 0.0 0.1 1.7 11.3 36.7

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