Grass Valley, CA
Climate overview — based on NOAA 1991-2020 normals from GRASS VALLEY #2, CA US.
Year-round temperatures (°F)
Climate summary
Grass Valley has an annual average temperature of 56.1°F with about 53.2 inches of precipitation per year and 8.6 inches of snow. The warmest month is July (average high 88.0°F), and the coldest is December (average low 32.6°F). December is typically the wettest month (10.48 in) and July the driest (0.00 in). Snow typically falls from November through April.
Best time to visit Grass Valley
Full guide →Climate change signal
All-time records →83 of 366 (22.7%) of Grass Valley's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1960s | 41 | |
| 1970s | 79 | |
| 1980s | 80 | |
| 1990s | 24 | |
| 2000s | 49 | |
| 2010s | 37 | |
| 2020s | 56 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 53.6°F | 33.1°F | 43.4°F | 9.30 in | 0.7 in | 13 |
| February | 54.9°F | 34.2°F | 44.5°F | 8.98 in | 3.0 in | 12 |
| March | 57.9°F | 37.0°F | 47.5°F | 8.16 in | 3.0 in | 12 |
| April | 62.7°F | 40.0°F | 51.3°F | 4.43 in | 0.5 in | 9 |
| May | 70.8°F | 46.8°F | 58.8°F | 2.48 in | — | 6 |
| June | 80.2°F | 52.6°F | 66.4°F | 0.74 in | — | 3 |
| July | 88.0°F | 58.2°F | 73.1°F | 0.00 in | — | 0 |
| August | 87.4°F | 56.8°F | 72.1°F | 0.11 in | — | 1 |
| September | 82.3°F | 52.1°F | 67.2°F | 0.44 in | — | 2 |
| October | 72.1°F | 44.2°F | 58.2°F | 2.56 in | — | 4 |
| November | 59.8°F | 37.1°F | 48.4°F | 5.52 in | 0.2 in | 8 |
| December | 52.6°F | 32.6°F | 42.6°F | 10.48 in | 1.2 in | 12 |
Climate twins of Grass Valley
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).