Monthly Weather Information
| January |
29.6 |
14.3 |
22.0 |
1.75 |
11.0 |
| February |
34.7 |
19.2 |
27.0 |
1.63 |
7.8 |
| March |
46.1 |
28.5 |
37.3 |
2.65 |
6.9 |
| April |
58.0 |
37.6 |
47.8 |
3.68 |
1.6 |
| May |
69.9 |
47.5 |
58.7 |
3.38 |
0.1 |
| June |
79.2 |
57.2 |
68.2 |
3.63 |
- |
| July |
83.5 |
63.2 |
73.3 |
3.51 |
- |
| August |
81.2 |
62.2 |
71.7 |
4.62 |
- |
| September |
73.9 |
53.7 |
63.8 |
3.27 |
- |
| October |
62.1 |
42.1 |
52.1 |
2.71 |
0.4 |
| November |
47.1 |
31.6 |
39.3 |
3.01 |
2.0 |
| December |
34.4 |
20.4 |
27.4 |
2.43 |
8.2 |
Source: The Chicago Convention and Tourism Bureau, National Climatic Data Center