Weather World
Cass County, IL Official Website
Cass County Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 34°F Lo 21°F | Hi 39°F Lo 24°F | Hi 52°F Lo 36°F | Hi 63°F Lo 45°F | Hi 73°F Lo 56°F | Hi 82°F Lo 65°F | Hi 84°F Lo 67°F | Hi 84°F Lo 65°F | Hi 79°F Lo 59°F | Hi 66°F Lo 48°F | Hi 52°F Lo 36°F | Hi 41°F Lo 28°F |
| 10 mph | 10 mph | 10 mph | 10 mph | 9 mph | 8 mph | 6 mph | 7 mph | 8 mph | 10 mph | 10 mph | 10 mph |
| 2.3 in | 2.5 in | 4.3 in | 6.1 in | 6.2 in | 6.3 in | 5 in | 3.5 in | 3.4 in | 3.8 in | 3.3 in | 2.7 in |
| 78% | 77% | 73% | 74% | 77% | 79% | 81% | 77% | 71% | 67% | 70% | 76% |
| 54% | 52% | 49% | 46% | 42% | 33% | 32% | 31% | 29% | 35% | 39% | 51% |
| 30.1 in | 30.1 in | 30.0 in | 29.9 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 20 | 19 | 22 | 22 | 20 | 21 | 23 | 24 | 25 | 24 | 24 | 23 |
| 7 | 6 | 7 | 8 | 11 | 9 | 8 | 7 | 5 | 6 | 5 | 6 |
| 4 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| 1 | 2 | 3 | 4 | 5 | 6 | 5 | 5 | 5 | 3 | 2 | 2 |
| 138 | 137 | 160 | 158 | 178 | 226 | 231 | 235 | 242 | 205 | 196 | 154 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 1°C Lo -6°C | Hi 4°C Lo -4°C | Hi 11°C Lo 2°C | Hi 17°C Lo 7°C | Hi 23°C Lo 13°C | Hi 28°C Lo 18°C | Hi 29°C Lo 20°C | Hi 29°C Lo 19°C | Hi 26°C Lo 15°C | Hi 19°C Lo 9°C | Hi 11°C Lo 3°C | Hi 5°C Lo -2°C |
| 16 km/h | 16 km/h | 17 km/h | 16 km/h | 14 km/h | 12 km/h | 10 km/h | 11 km/h | 12 km/h | 15 km/h | 16 km/h | 16 km/h |
| 59 mm | 64 mm | 109 mm | 156 mm | 157 mm | 159 mm | 126 mm | 90 mm | 85 mm | 97 mm | 84 mm | 68 mm |
| 78% | 77% | 73% | 74% | 77% | 79% | 81% | 77% | 71% | 67% | 70% | 76% |
| 54% | 52% | 49% | 46% | 42% | 33% | 32% | 31% | 29% | 35% | 39% | 51% |
| 1021 mb | 1020 mb | 1017 mb | 1014 mb | 1014 mb | 1013 mb | 1015 mb | 1015 mb | 1017 mb | 1017 mb | 1020 mb | 1020 mb |
| 20 | 19 | 22 | 22 | 20 | 21 | 23 | 24 | 25 | 24 | 24 | 23 |
| 7 | 6 | 7 | 8 | 11 | 9 | 8 | 7 | 5 | 6 | 5 | 6 |
| 4 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| 1 | 2 | 3 | 4 | 5 | 6 | 5 | 5 | 5 | 3 | 2 | 2 |
| 138 | 137 | 160 | 158 | 178 | 226 | 231 | 235 | 242 | 205 | 196 | 154 |
| Month |
| Avg. Temperatures |
| Avg. Wind Speed |
| Avg. Precipitation |
| Average Humidity |
| Avg. Cloud Cover |
| Pressure Average |
| Average Dry Days |
| Avg. Precip. Days |
| Avg. Snow Days |
| Average Fog Days |
| Average UV Index |
| Avg. Hours of Sun |
Averages are based on historical weather data from the past 10 years.