Delft Colony, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 49.8 °F (low) to 76.4 °F (high). Annual precipitation averages 11.5 Inches. Delft Colony is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Frost Rare through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.0 °F | 56.2 °F | 2.34 in. |
| February | 40.5 °F | 62.1 °F | 1.98 in. |
| March | 44.0 °F | 68.2 °F | 2.0 in. |
| April | 47.1 °F | 73.5 °F | 1.1 in. |
| May | 53.7 °F | 82.2 °F | 0.46 in. |
| June | 59.3 °F | 90.5 °F | 0.15 in. |
| July | 64.7 °F | 96.4 °F | 0.02 in. |
| August | 62.9 °F | 95.7 °F | 0.01 in. |
| September | 58.4 °F | 90.3 °F | 0.06 in. |
| October | 50.5 °F | 79.4 °F | 0.53 in. |
| November | 41.8 °F | 66.2 °F | 0.98 in. |
| December | 36.6 °F | 56.4 °F | 1.89 in. |
| Annual | 49.8 °F | 76.4 °F | 11.52 in. |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Frost Rare |
| 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 | BSk - Cold Semi-Arid Climate |