Pine Grove, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48.4 °F (low) to 70.6 °F (high). Annual precipitation averages 37.1 Inches. 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 | 38.4 °F | 54.2 °F | 6.58 in. |
| February | 39.1 °F | 55.8 °F | 6.25 in. |
| March | 40.7 °F | 59.6 °F | 5.49 in. |
| April | 43.0 °F | 64.9 °F | 3.48 in. |
| May | 48.9 °F | 73.5 °F | 2.16 in. |
| June | 55.9 °F | 83.1 °F | 0.47 in. |
| July | 62.7 °F | 90.8 °F | 0.02 in. |
| August | 62.5 °F | 90.2 °F | 0.08 in. |
| September | 58.7 °F | 85.4 °F | 0.32 in. |
| October | 50.9 °F | 75.0 °F | 1.93 in. |
| November | 42.6 °F | 61.0 °F | 3.69 in. |
| December | 37.7 °F | 53.2 °F | 6.62 in. |
| Annual | 48.4 °F | 70.6 °F | 37.09 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |