DECATUR WTP, IL US
GHCN ID: USC00112193 · IL, US · 194.8 m elevation · Records 1893-2026 (133 years)
Primary station for Decatur, IL.
Monthly climate normals (1991-2020)
| Month | High | Low | Mean | Precip | Snow |
|---|---|---|---|---|---|
| January | 34.0°F | 19.7°F | 26.9°F | 2.40 in | 5.9 in |
| February | 39.1°F | 23.5°F | 31.3°F | 2.00 in | 2.5 in |
| March | 50.8°F | 32.8°F | 41.8°F | 2.64 in | 0.9 in |
| April | 63.4°F | 43.3°F | 53.3°F | 4.12 in | 0.4 in |
| May | 73.5°F | 53.8°F | 63.7°F | 4.95 in | — |
| June | 82.2°F | 63.1°F | 72.6°F | 4.73 in | — |
| July | 84.7°F | 66.5°F | 75.6°F | 4.00 in | — |
| August | 83.5°F | 64.9°F | 74.2°F | 3.50 in | — |
| September | 77.7°F | 57.0°F | 67.3°F | 3.08 in | — |
| October | 65.3°F | 45.7°F | 55.5°F | 3.41 in | — |
| November | 50.3°F | 34.3°F | 42.3°F | 3.21 in | 0.4 in |
| December | 38.6°F | 25.0°F | 31.8°F | 2.40 in | 3.5 in |