Roseville, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.5 °C (low) to 23.7 °C (high). Annual precipitation averages 608.3 Millimeters. Roseville is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °C | 13.1 °C | 107.7 mm |
| February | 5 °C | 15.8 °C | 110.49 mm |
| March | 6.7 °C | 18.7 °C | 88.65 mm |
| April | 8 °C | 21.9 °C | 44.45 mm |
| May | 11.1 °C | 26.6 °C | 33.53 mm |
| June | 14.1 °C | 31.2 °C | 7.11 mm |
| July | 16.1 °C | 34.5 °C | 0.51 mm |
| August | 15.7 °C | 34.1 °C | 0.76 mm |
| September | 13.8 °C | 31.6 °C | 4.83 mm |
| October | 10.1 °C | 25.8 °C | 35.05 mm |
| November | 5.9 °C | 18.1 °C | 57.91 mm |
| December | 3.6 °C | 13.2 °C | 117.35 mm |
| Annual | 9.5 °C | 23.7 °C | 608.34 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |