Claremont, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 11.2 °C (low) to 25.3 °C (high). Annual precipitation averages 443.5 Millimeters. Claremont is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °C | 19.3 °C | 100.33 mm |
| February | 7 °C | 19.5 °C | 108.97 mm |
| March | 8.1 °C | 21.2 °C | 75.44 mm |
| April | 9.4 °C | 23.3 °C | 19.81 mm |
| May | 11.6 °C | 25.3 °C | 14.73 mm |
| June | 13.8 °C | 28.8 °C | 3.3 mm |
| July | 16.4 °C | 32.3 °C | 2.29 mm |
| August | 16.9 °C | 33.4 °C | 0.51 mm |
| September | 15.9 °C | 31.8 °C | 3.81 mm |
| October | 12.8 °C | 27.2 °C | 20.83 mm |
| November | 8.9 °C | 22.9 °C | 26.67 mm |
| December | 6.6 °C | 18.7 °C | 66.8 mm |
| Annual | 11.2 °C | 25.3 °C | 443.49 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |