Pleasanton, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 9.1 °C (low) to 22.2 °C (high). Annual precipitation averages 506.7 Millimeters. Pleasanton is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.4 °C | 14.1 °C | 94.49 mm |
| February | 5.4 °C | 16.2 °C | 99.31 mm |
| March | 6.6 °C | 18.3 °C | 77.72 mm |
| April | 7.9 °C | 20.2 °C | 36.83 mm |
| May | 10.3 °C | 23.2 °C | 18.29 mm |
| June | 12.2 °C | 27.2 °C | 3.56 mm |
| July | 13.8 °C | 30.4 °C | 0 mm |
| August | 13.8 °C | 30.2 °C | 0.76 mm |
| September | 13 °C | 29.1 °C | 2.03 mm |
| October | 10.4 °C | 25 °C | 25.15 mm |
| November | 6.6 °C | 18.6 °C | 51.05 mm |
| December | 4.3 °C | 14.2 °C | 97.54 mm |
| Annual | 9.1 °C | 22.2 °C | 506.73 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°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 |