Bloomington, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 52.2 °F (low) to 79.4 °F (high). Annual precipitation averages 13.3 Inches. Bloomington is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.1 °F | 67.2 °F | 2.88 in. |
| February | 44.0 °F | 67.5 °F | 3.48 in. |
| March | 46.5 °F | 71.0 °F | 2.21 in. |
| April | 49.2 °F | 75.5 °F | 0.74 in. |
| May | 53.8 °F | 80.1 °F | 0.3 in. |
| June | 58.0 °F | 87.1 °F | 0.07 in. |
| July | 62.9 °F | 93.9 °F | 0.06 in. |
| August | 63.7 °F | 95.3 °F | 0.05 in. |
| September | 61.2 °F | 92.0 °F | 0.14 in. |
| October | 54.7 °F | 82.9 °F | 0.6 in. |
| November | 47.3 °F | 74.1 °F | 0.79 in. |
| December | 42.3 °F | 66.5 °F | 2.01 in. |
| Annual | 52.2 °F | 79.4 °F | 13.33 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |