Bloomfield, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.9 °C (low) to 20.3 °C (high). Annual precipitation averages 937.8 Millimeters. Bloomfield is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 14 °C | 177.04 mm |
| February | 4.3 °C | 15.8 °C | 186.94 mm |
| March | 5.1 °C | 17.2 °C | 123.95 mm |
| April | 5.9 °C | 18.9 °C | 61.47 mm |
| May | 7.7 °C | 21.3 °C | 35.56 mm |
| June | 9.4 °C | 24.2 °C | 9.14 mm |
| July | 10.6 °C | 25.2 °C | 1.27 mm |
| August | 10.7 °C | 25.8 °C | 3.3 mm |
| September | 9.5 °C | 25.9 °C | 4.06 mm |
| October | 7.7 °C | 23.5 °C | 43.94 mm |
| November | 5.2 °C | 18.2 °C | 99.06 mm |
| December | 3.3 °C | 14.1 °C | 192.02 mm |
| Annual | 6.9 °C | 20.3 °C | 937.75 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |