US Geography / US Weather / Illinois Weather / Northbrook |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 28° | 34° | 45° | 58° | 70° | 78° | 84° | 81° | 74° | 64° | 48° | 34° |
| Avg. Low | 12° | 17° | 28° | 38° | 47° | 57° | 62° | 61° | 54° | 42° | 31° | 18° |
| Mean | 21° | 25° | 37° | 48° | 58° | 68° | 74° | 72° | 64° | 54° | 40° | 27° |
| Avg. Precip. | 1.5 in | 1.4 in | 2.7 in | 3.6 in | 3.3 in | 3.8 in | 3.7 in | 4.3 in | 3.8 in | 2.4 in | 2.9 in | 2.5 in |
Degrees in Fahrenheit
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