WeatherWX.com
Decatur Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 34°F Lo 20°F | Hi 38°F Lo 21°F | Hi 47°F Lo 29°F | Hi 59°F Lo 39°F | Hi 70°F Lo 50°F | Hi 78°F Lo 57°F | Hi 84°F Lo 63°F | Hi 82°F Lo 61°F | Hi 75°F Lo 55°F | Hi 62°F Lo 45°F | Hi 49°F Lo 33°F | Hi 39°F Lo 27°F |
| 7 mph | 7 mph | 7 mph | 7 mph | 6 mph | 6 mph | 5 mph | 4 mph | 5 mph | 6 mph | 6 mph | 7 mph |
| 2.8 in | 3.2 in | 3.3 in | 4.1 in | 4.2 in | 4 in | 4 in | 3.9 in | 5.3 in | 4.1 in | 2.8 in | 3.9 in |
| 81% | 83% | 77% | 76% | 78% | 76% | 75% | 77% | 79% | 80% | 78% | 82% |
| 58% | 57% | 52% | 49% | 48% | 40% | 37% | 38% | 39% | 45% | 43% | 57% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in | 30.1 in | 30.0 in | 30.1 in | 30.1 in |
| 17 | 15 | 20 | 22 | 21 | 20 | 21 | 22 | 23 | 24 | 24 | 18 |
| 9 | 9 | 8 | 8 | 10 | 10 | 10 | 9 | 7 | 7 | 5 | 9 |
| 5 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 2 | 3 | 5 | 6 | 5 | 5 | 4 | 2 | 1 | 1 |
| 106 | 102 | 137 | 144 | 166 | 190 | 214 | 211 | 202 | 172 | 171 | 115 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 1°C Lo -7°C | Hi 3°C Lo -6°C | Hi 8°C Lo -2°C | Hi 15°C Lo 4°C | Hi 21°C Lo 10°C | Hi 26°C Lo 14°C | Hi 29°C Lo 17°C | Hi 28°C Lo 16°C | Hi 24°C Lo 13°C | Hi 17°C Lo 7°C | Hi 9°C Lo 1°C | Hi 4°C Lo -3°C |
| 12 km/h | 11 km/h | 12 km/h | 11 km/h | 9 km/h | 9 km/h | 7 km/h | 7 km/h | 8 km/h | 9 km/h | 10 km/h | 11 km/h |
| 71 mm | 81 mm | 83 mm | 104 mm | 106 mm | 102 mm | 101 mm | 100 mm | 135 mm | 103 mm | 70 mm | 98 mm |
| 81% | 83% | 77% | 76% | 78% | 76% | 75% | 77% | 79% | 80% | 78% | 82% |
| 58% | 57% | 52% | 49% | 48% | 40% | 37% | 38% | 39% | 45% | 43% | 57% |
| 1019 mb | 1019 mb | 1019 mb | 1016 mb | 1017 mb | 1014 mb | 1015 mb | 1016 mb | 1018 mb | 1017 mb | 1021 mb | 1019 mb |
| 17 | 15 | 20 | 22 | 21 | 20 | 21 | 22 | 23 | 24 | 24 | 18 |
| 9 | 9 | 8 | 8 | 10 | 10 | 10 | 9 | 7 | 7 | 5 | 9 |
| 5 | 5 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 2 | 3 | 5 | 6 | 5 | 5 | 4 | 2 | 1 | 1 |
| 106 | 102 | 137 | 144 | 166 | 190 | 214 | 211 | 202 | 172 | 171 | 115 |
| 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.