WeatherWX.com
Grass Valley Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 42°F Lo 30°F | Hi 45°F Lo 31°F | Hi 52°F Lo 35°F | Hi 60°F Lo 40°F | Hi 69°F Lo 47°F | Hi 77°F Lo 53°F | Hi 87°F Lo 59°F | Hi 87°F Lo 61°F | Hi 77°F Lo 55°F | Hi 62°F Lo 46°F | Hi 48°F Lo 35°F | Hi 40°F Lo 29°F |
| 5 mph | 6 mph | 6 mph | 7 mph | 7 mph | 8 mph | 8 mph | 7 mph | 6 mph | 5 mph | 5 mph | 5 mph |
| 4 in | 3 in | 3 in | 1.8 in | 1.2 in | 0.6 in | 0.1 in | 0.2 in | 0.8 in | 2.4 in | 3.2 in | 4.4 in |
| 84% | 81% | 76% | 66% | 60% | 54% | 46% | 45% | 52% | 63% | 76% | 84% |
| 50% | 46% | 44% | 36% | 27% | 19% | 8% | 9% | 17% | 29% | 40% | 50% |
| 30.2 in | 30.1 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in | 30.1 in | 30.1 in |
| 18 | 17 | 22 | 25 | 26 | 28 | 31 | 30 | 28 | 25 | 21 | 16 |
| 10 | 9 | 8 | 5 | 5 | 2 | 0 | 1 | 2 | 6 | 8 | 10 |
| 3 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 1 | 3 | 3 | 4 | 6 | 7 | 5 | 4 | 3 | 2 | 2 |
| 148 | 144 | 167 | 200 | 257 | 294 | 349 | 347 | 296 | 235 | 173 | 146 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 5°C Lo -1°C | Hi 7°C Lo -1°C | Hi 11°C Lo 2°C | Hi 15°C Lo 4°C | Hi 21°C Lo 8°C | Hi 25°C Lo 12°C | Hi 31°C Lo 15°C | Hi 30°C Lo 16°C | Hi 25°C Lo 13°C | Hi 17°C Lo 8°C | Hi 9°C Lo 2°C | Hi 4°C Lo -2°C |
| 7 km/h | 9 km/h | 9 km/h | 11 km/h | 11 km/h | 12 km/h | 12 km/h | 11 km/h | 10 km/h | 8 km/h | 8 km/h | 7 km/h |
| 101 mm | 75 mm | 75 mm | 46 mm | 31 mm | 15 mm | 2 mm | 4 mm | 21 mm | 62 mm | 82 mm | 111 mm |
| 84% | 81% | 76% | 66% | 60% | 54% | 46% | 45% | 52% | 63% | 76% | 84% |
| 50% | 46% | 44% | 36% | 27% | 19% | 8% | 9% | 17% | 29% | 40% | 50% |
| 1021 mb | 1020 mb | 1017 mb | 1017 mb | 1015 mb | 1014 mb | 1015 mb | 1014 mb | 1015 mb | 1017 mb | 1019 mb | 1020 mb |
| 18 | 17 | 22 | 25 | 26 | 28 | 31 | 30 | 28 | 25 | 21 | 16 |
| 10 | 9 | 8 | 5 | 5 | 2 | 0 | 1 | 2 | 6 | 8 | 10 |
| 3 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 1 | 3 | 3 | 4 | 6 | 7 | 5 | 4 | 3 | 2 | 2 |
| 148 | 144 | 167 | 200 | 257 | 294 | 349 | 347 | 296 | 235 | 173 | 146 |
| 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.