Weather World
Decorah Lake Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 24°F Lo 10°F | Hi 28°F Lo 13°F | Hi 42°F Lo 26°F | Hi 53°F Lo 36°F | Hi 66°F Lo 48°F | Hi 76°F Lo 58°F | Hi 80°F Lo 62°F | Hi 79°F Lo 60°F | Hi 73°F Lo 53°F | Hi 58°F Lo 42°F | Hi 43°F Lo 30°F | Hi 30°F Lo 19°F |
| 9 mph | 9 mph | 9 mph | 10 mph | 8 mph | 8 mph | 7 mph | 7 mph | 8 mph | 9 mph | 9 mph | 9 mph |
| 1.5 in | 1.7 in | 3.8 in | 5.1 in | 4.7 in | 6.1 in | 4.9 in | 4.1 in | 3.8 in | 3.9 in | 2.6 in | 2.4 in |
| 87% | 87% | 79% | 76% | 78% | 80% | 79% | 77% | 76% | 74% | 76% | 84% |
| 66% | 64% | 56% | 56% | 45% | 40% | 34% | 33% | 37% | 45% | 49% | 64% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 29.9 in | 30.0 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 18 | 18 | 20 | 18 | 23 | 21 | 24 | 24 | 24 | 24 | 23 | 19 |
| 8 | 6 | 7 | 10 | 8 | 9 | 7 | 7 | 6 | 7 | 5 | 7 |
| 5 | 4 | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 5 |
| 1 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 2 |
| 1 | 1 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 2 | 1 | 1 |
| 89 | 92 | 129 | 125 | 178 | 194 | 232 | 235 | 204 | 166 | 158 | 99 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi -5°C Lo -12°C | Hi -2°C Lo -10°C | Hi 6°C Lo -3°C | Hi 12°C Lo 2°C | Hi 19°C Lo 9°C | Hi 24°C Lo 15°C | Hi 27°C Lo 17°C | Hi 26°C Lo 16°C | Hi 23°C Lo 12°C | Hi 14°C Lo 6°C | Hi 6°C Lo -1°C | Hi -1°C Lo -7°C |
| 15 km/h | 15 km/h | 15 km/h | 16 km/h | 14 km/h | 12 km/h | 11 km/h | 11 km/h | 12 km/h | 14 km/h | 15 km/h | 14 km/h |
| 39 mm | 42 mm | 97 mm | 129 mm | 120 mm | 154 mm | 124 mm | 105 mm | 97 mm | 100 mm | 65 mm | 61 mm |
| 87% | 87% | 79% | 76% | 78% | 80% | 79% | 77% | 76% | 74% | 76% | 84% |
| 66% | 64% | 56% | 56% | 45% | 40% | 34% | 33% | 37% | 45% | 49% | 64% |
| 1020 mb | 1020 mb | 1018 mb | 1014 mb | 1015 mb | 1013 mb | 1014 mb | 1015 mb | 1017 mb | 1016 mb | 1018 mb | 1019 mb |
| 18 | 18 | 20 | 18 | 23 | 21 | 24 | 24 | 24 | 24 | 23 | 19 |
| 8 | 6 | 7 | 10 | 8 | 9 | 7 | 7 | 6 | 7 | 5 | 7 |
| 5 | 4 | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 5 |
| 1 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 2 |
| 1 | 1 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 2 | 1 | 1 |
| 89 | 92 | 129 | 125 | 178 | 194 | 232 | 235 | 204 | 166 | 158 | 99 |
| 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.