Pine Grove, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.1 °C (low) to 21.4 °C (high). Annual precipitation averages 942.1 Millimeters. Pine Grove is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 12.3 °C | 167.13 mm |
| February | 3.9 °C | 13.2 °C | 158.75 mm |
| March | 4.8 °C | 15.3 °C | 139.45 mm |
| April | 6.1 °C | 18.3 °C | 88.39 mm |
| May | 9.4 °C | 23.1 °C | 54.86 mm |
| June | 13.3 °C | 28.4 °C | 11.94 mm |
| July | 17.1 °C | 32.7 °C | 0.51 mm |
| August | 16.9 °C | 32.3 °C | 2.03 mm |
| September | 14.8 °C | 29.7 °C | 8.13 mm |
| October | 10.5 °C | 23.9 °C | 49.02 mm |
| November | 5.9 °C | 16.1 °C | 93.73 mm |
| December | 3.2 °C | 11.8 °C | 168.15 mm |
| Annual | 9.1 °C | 21.4 °C | 942.09 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |