Weather World
Napa County, CA Official Website
Napa County Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 56°F Lo 40°F | Hi 59°F Lo 41°F | Hi 62°F Lo 43°F | Hi 69°F Lo 45°F | Hi 76°F Lo 50°F | Hi 84°F Lo 55°F | Hi 88°F Lo 56°F | Hi 88°F Lo 57°F | Hi 86°F Lo 57°F | Hi 76°F Lo 53°F | Hi 63°F Lo 45°F | Hi 55°F Lo 41°F |
| 4 mph | 5 mph | 5 mph | 5 mph | 6 mph | 6 mph | 6 mph | 5 mph | 5 mph | 4 mph | 4 mph | 4 mph |
| 5 in | 5.4 in | 4.6 in | 1.4 in | 0.6 in | 0.2 in | 0 in | 0 in | 0.2 in | 1.5 in | 3.7 in | 6 in |
| 73% | 74% | 75% | 69% | 63% | 57% | 56% | 57% | 54% | 55% | 64% | 72% |
| 38% | 38% | 41% | 30% | 21% | 13% | 9% | 7% | 11% | 19% | 29% | 41% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 29.9 in | 29.9 in | 29.9 in | 30.0 in | 30.1 in | 30.1 in |
| 25 | 23 | 25 | 27 | 29 | 29 | 31 | 31 | 29 | 29 | 26 | 24 |
| 6 | 5 | 6 | 3 | 2 | 1 | 0 | 0 | 1 | 2 | 4 | 7 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 3 | 3 | 3 | 5 | 5 | 6 | 5 | 6 | 5 | 4 | 3 | 2 |
| 211 | 193 | 196 | 236 | 277 | 304 | 328 | 352 | 322 | 289 | 245 | 201 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 13°C Lo 5°C | Hi 15°C Lo 5°C | Hi 17°C Lo 6°C | Hi 21°C Lo 7°C | Hi 24°C Lo 10°C | Hi 29°C Lo 13°C | Hi 31°C Lo 13°C | Hi 31°C Lo 14°C | Hi 30°C Lo 14°C | Hi 25°C Lo 12°C | Hi 17°C Lo 7°C | Hi 13°C Lo 5°C |
| 7 km/h | 8 km/h | 8 km/h | 9 km/h | 10 km/h | 9 km/h | 9 km/h | 8 km/h | 7 km/h | 7 km/h | 6 km/h | 7 km/h |
| 127 mm | 136 mm | 115 mm | 36 mm | 16 mm | 4 mm | 1 mm | 0 mm | 5 mm | 39 mm | 93 mm | 154 mm |
| 73% | 74% | 75% | 69% | 63% | 57% | 56% | 57% | 54% | 55% | 64% | 72% |
| 38% | 38% | 41% | 30% | 21% | 13% | 9% | 7% | 11% | 19% | 29% | 41% |
| 1020 mb | 1019 mb | 1018 mb | 1017 mb | 1014 mb | 1013 mb | 1013 mb | 1013 mb | 1013 mb | 1015 mb | 1018 mb | 1020 mb |
| 25 | 23 | 25 | 27 | 29 | 29 | 31 | 31 | 29 | 29 | 26 | 24 |
| 6 | 5 | 6 | 3 | 2 | 1 | 0 | 0 | 1 | 2 | 4 | 7 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
| 3 | 3 | 3 | 5 | 5 | 6 | 5 | 6 | 5 | 4 | 3 | 2 |
| 211 | 193 | 196 | 236 | 277 | 304 | 328 | 352 | 322 | 289 | 245 | 201 |
| 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.