Knightsen, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 49.4 °F (low) to 72.9 °F (high). Annual precipitation averages 14 Inches. Knightsen is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.6 °F | 55.6 °F | 2.87 in. |
| February | 42.1 °F | 60.6 °F | 2.68 in. |
| March | 45.1 °F | 65.8 °F | 1.89 in. |
| April | 48.1 °F | 70.5 °F | 1.04 in. |
| May | 52.6 °F | 77.3 °F | 0.5 in. |
| June | 56.7 °F | 84.4 °F | 0.14 in. |
| July | 58.7 °F | 89.1 °F | 0.0 in. |
| August | 58.9 °F | 88.1 °F | 0.03 in. |
| September | 56.8 °F | 85.5 °F | 0.07 in. |
| October | 51.4 °F | 77.2 °F | 0.64 in. |
| November | 43.7 °F | 64.9 °F | 1.41 in. |
| December | 39.3 °F | 55.9 °F | 2.72 in. |
| Annual | 49.4 °F | 72.9 °F | 13.99 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |