Pomona, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 52.3 °F (low) to 77.8 °F (high). Annual precipitation averages 16.2 Inches. Pomona is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.0 °F | 67.7 °F | 3.59 in. |
| February | 44.8 °F | 68.0 °F | 4.34 in. |
| March | 46.9 °F | 70.8 °F | 2.58 in. |
| April | 49.3 °F | 74.0 °F | 0.76 in. |
| May | 53.7 °F | 77.5 °F | 0.38 in. |
| June | 57.4 °F | 83.0 °F | 0.11 in. |
| July | 61.9 °F | 89.6 °F | 0.06 in. |
| August | 62.5 °F | 91.8 °F | 0.01 in. |
| September | 60.6 °F | 88.7 °F | 0.13 in. |
| October | 55.1 °F | 81.4 °F | 0.7 in. |
| November | 48.1 °F | 74.2 °F | 0.9 in. |
| December | 43.3 °F | 66.8 °F | 2.64 in. |
| Annual | 52.3 °F | 77.8 °F | 16.2 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |