O'Hare Monthly and Yearly Normals   (1971-2000)
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 29.6 34.7 46.1 58.0 69.9 79.2 83.5 81.2 73.9 62.1 47.1 34.4 58.3
Low °F 14.3 19.2 28.5 37.6 47.5 57.2 63.2 62.2 53.7 42.1 31.6 20.4 39.8
Mean °F 22.0 27.0 37.3 47.8 58.7 68.2 73.3 71.7 63.8 52.1 39.3 27.4 49.1
Precip. (in) 1.75 1.63 2.65 3.68 3.38 3.63 3.51 4.62 3.27 2.71 3.01 2.43 36.27
Snow (in) 11.3 8.3 6.0 1.6 0.0 0.0 0.0 0.0 0.0 0.3 1.8 8.7 38.0
HDD 1333 1075 858 513 232 49 6 9 112 401 759 1151 6498
CDD 0 0 1 9 48 159 279 233 91 10 0 0 830
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