Diamond Springs, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.5 °C (low) to 21.7 °C (high). Annual precipitation averages 979.9 Millimeters. Diamond Springs is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.7 °C | 12.4 °C | 179.58 mm |
| February | 3.7 °C | 14 °C | 171.45 mm |
| March | 4.8 °C | 16.2 °C | 144.78 mm |
| April | 6.1 °C | 18.4 °C | 86.61 mm |
| May | 9.3 °C | 23.2 °C | 51.05 mm |
| June | 12.7 °C | 28.6 °C | 13.21 mm |
| July | 15.8 °C | 32.8 °C | 0.25 mm |
| August | 15.8 °C | 32.6 °C | 1.78 mm |
| September | 13.6 °C | 29.8 °C | 8.38 mm |
| October | 9.7 °C | 24 °C | 48.01 mm |
| November | 5.2 °C | 16.7 °C | 97.03 mm |
| December | 2.6 °C | 12.1 °C | 177.8 mm |
| Annual | 8.5 °C | 21.7 °C | 979.93 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |