Redlands, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 11 °C (low) to 26.1 °C (high). Annual precipitation averages 320 Millimeters. Redlands is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.8 °C | 19.1 °C | 67.56 mm |
| February | 6.2 °C | 19.2 °C | 77.72 mm |
| March | 7.7 °C | 21.2 °C | 50.29 mm |
| April | 9.2 °C | 23.7 °C | 22.1 mm |
| May | 11.8 °C | 26.6 °C | 8.64 mm |
| June | 14.1 °C | 30.8 °C | 2.03 mm |
| July | 17.1 °C | 34.8 °C | 2.29 mm |
| August | 17.6 °C | 35.4 °C | 2.03 mm |
| September | 16.1 °C | 33.4 °C | 3.3 mm |
| October | 12.3 °C | 27.8 °C | 13.21 mm |
| November | 8.3 °C | 23 °C | 20.83 mm |
| December | 5.4 °C | 18.6 °C | 50.04 mm |
| Annual | 11 °C | 26.1 °C | 320.04 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |