Weather World
Washington County, IL Official Website
Washington County Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 39°F Lo 25°F | Hi 44°F Lo 29°F | Hi 56°F Lo 39°F | Hi 65°F Lo 47°F | Hi 75°F Lo 58°F | Hi 84°F Lo 67°F | Hi 87°F Lo 70°F | Hi 85°F Lo 67°F | Hi 81°F Lo 62°F | Hi 68°F Lo 50°F | Hi 54°F Lo 39°F | Hi 45°F Lo 32°F |
| 10 mph | 10 mph | 10 mph | 10 mph | 8 mph | 7 mph | 6 mph | 6 mph | 7 mph | 9 mph | 9 mph | 9 mph |
| 3.7 in | 3.8 in | 5.2 in | 8 in | 7.5 in | 5.9 in | 6 in | 4.4 in | 4.2 in | 4.8 in | 4.2 in | 4.1 in |
| 76% | 77% | 76% | 77% | 79% | 76% | 78% | 77% | 72% | 68% | 71% | 76% |
| 50% | 51% | 48% | 44% | 41% | 31% | 31% | 29% | 30% | 33% | 37% | 49% |
| 30.2 in | 30.1 in | 30.1 in | 30.0 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 |
| 22 | 19 | 23 | 21 | 20 | 20 | 21 | 23 | 24 | 25 | 24 | 23 |
| 6 | 7 | 7 | 8 | 11 | 10 | 10 | 8 | 6 | 6 | 6 | 6 |
| 3 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
| 2 | 2 | 3 | 4 | 5 | 6 | 6 | 6 | 5 | 3 | 2 | 2 |
| 156 | 142 | 159 | 168 | 189 | 229 | 234 | 243 | 234 | 221 | 205 | 163 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 4°C Lo -4°C | Hi 7°C Lo -2°C | Hi 13°C Lo 4°C | Hi 18°C Lo 9°C | Hi 24°C Lo 14°C | Hi 29°C Lo 20°C | Hi 31°C Lo 21°C | Hi 30°C Lo 20°C | Hi 27°C Lo 16°C | Hi 20°C Lo 10°C | Hi 13°C Lo 4°C | Hi 7°C Lo -0°C |
| 15 km/h | 16 km/h | 16 km/h | 15 km/h | 13 km/h | 11 km/h | 10 km/h | 10 km/h | 11 km/h | 14 km/h | 15 km/h | 15 km/h |
| 93 mm | 96 mm | 132 mm | 204 mm | 190 mm | 150 mm | 153 mm | 110 mm | 106 mm | 122 mm | 107 mm | 103 mm |
| 76% | 77% | 76% | 77% | 79% | 76% | 78% | 77% | 72% | 68% | 71% | 76% |
| 50% | 51% | 48% | 44% | 41% | 31% | 31% | 29% | 30% | 33% | 37% | 49% |
| 1021 mb | 1020 mb | 1018 mb | 1015 mb | 1015 mb | 1014 mb | 1015 mb | 1015 mb | 1017 mb | 1017 mb | 1020 mb | 1020 mb |
| 22 | 19 | 23 | 21 | 20 | 20 | 21 | 23 | 24 | 25 | 24 | 23 |
| 6 | 7 | 7 | 8 | 11 | 10 | 10 | 8 | 6 | 6 | 6 | 6 |
| 3 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 1 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
| 2 | 2 | 3 | 4 | 5 | 6 | 6 | 6 | 5 | 3 | 2 | 2 |
| 156 | 142 | 159 | 168 | 189 | 229 | 234 | 243 | 234 | 221 | 205 | 163 |
| 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.