MARSEILLES LOCK, IL US
GHCN ID: USC00115372 · IL, US · 149.4 m elevation · Records 1941-2026 (85 years)
Primary station for Grand Ridge, IL.
Monthly climate normals (1991-2020)
| Month | High | Low | Mean | Precip | Snow |
|---|---|---|---|---|---|
| January | 31.4°F | 14.2°F | 22.8°F | 1.95 in | 8.4 in |
| February | 35.4°F | 17.2°F | 26.3°F | 1.90 in | 7.3 in |
| March | 47.5°F | 27.2°F | 37.3°F | 2.54 in | 2.9 in |
| April | 61.2°F | 37.3°F | 49.2°F | 3.59 in | 0.3 in |
| May | 72.6°F | 48.5°F | 60.5°F | 4.70 in | — |
| June | 81.1°F | 58.1°F | 69.6°F | 4.92 in | — |
| July | 84.0°F | 61.9°F | 73.0°F | 3.85 in | — |
| August | 82.4°F | 60.5°F | 71.5°F | 4.09 in | — |
| September | 77.1°F | 52.9°F | 65.0°F | 3.46 in | — |
| October | 64.1°F | 41.2°F | 52.7°F | 3.20 in | — |
| November | 49.1°F | 30.0°F | 39.6°F | 2.72 in | 0.8 in |
| December | 36.6°F | 20.5°F | 28.5°F | 2.11 in | 5.3 in |