Fulton, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.3 °F (low) to 70.8 °F (high). Annual precipitation averages 34.6 Inches. Fulton is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.7 °F | 57.5 °F | 6.76 in. |
| February | 39.1 °F | 61.1 °F | 6.76 in. |
| March | 40.9 °F | 64.3 °F | 4.81 in. |
| April | 42.5 °F | 68.1 °F | 2.25 in. |
| May | 46.0 °F | 73.3 °F | 1.43 in. |
| June | 49.5 °F | 79.6 °F | 0.3 in. |
| July | 51.4 °F | 81.8 °F | 0.03 in. |
| August | 51.6 °F | 82.4 °F | 0.08 in. |
| September | 49.4 °F | 82.1 °F | 0.15 in. |
| October | 45.6 °F | 76.5 °F | 1.61 in. |
| November | 40.4 °F | 65.4 °F | 3.66 in. |
| December | 37.1 °F | 57.6 °F | 6.72 in. |
| Annual | 44.3 °F | 70.8 °F | 34.56 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |