CRYSTAL LAKE 4NW, IL US
GHCN ID: USC00112048 · IL, US · 286.5 m elevation · Records 1991-2026 (35 years)
Primary station for Bull Valley, IL.
Monthly climate normals (1991-2020)
| Month | High | Low | Mean | Precip | Snow |
|---|---|---|---|---|---|
| January | 31.5°F | 14.2°F | 22.9°F | 1.97 in | 10.0 in |
| February | 35.2°F | 16.3°F | 25.8°F | 1.84 in | 9.0 in |
| March | 46.8°F | 26.4°F | 36.6°F | 2.51 in | 4.4 in |
| April | 59.2°F | 36.7°F | 48.0°F | 3.76 in | 1.2 in |
| May | 71.3°F | 47.9°F | 59.6°F | 4.98 in | — |
| June | 80.3°F | 58.4°F | 69.4°F | 5.26 in | — |
| July | 84.0°F | 62.5°F | 73.3°F | 3.90 in | — |
| August | 82.0°F | 61.2°F | 71.6°F | 3.81 in | — |
| September | 74.4°F | 52.4°F | 63.4°F | 3.54 in | — |
| October | 61.9°F | 42.4°F | 52.2°F | 3.20 in | 0.2 in |
| November | 47.5°F | 30.5°F | 39.0°F | 2.48 in | 1.6 in |
| December | 35.5°F | 20.4°F | 28.0°F | 2.10 in | 8.7 in |