Weed, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.7 °C (low) to 17.9 °C (high). Annual precipitation averages 712.7 Millimeters. Weed is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.8 °C | 7.3 °C | 103.12 mm |
| February | -2.1 °C | 9.3 °C | 108.2 mm |
| March | -0.7 °C | 12 °C | 97.54 mm |
| April | 1 °C | 15.3 °C | 71.88 mm |
| May | 4.3 °C | 20.6 °C | 49.53 mm |
| June | 7.6 °C | 25.4 °C | 22.61 mm |
| July | 10.6 °C | 30.9 °C | 16 mm |
| August | 9.7 °C | 30.4 °C | 6.86 mm |
| September | 6.4 °C | 26.7 °C | 8.13 mm |
| October | 2.4 °C | 19.2 °C | 36.83 mm |
| November | -0.8 °C | 11.2 °C | 83.06 mm |
| December | -3.1 °C | 6.5 °C | 108.97 mm |
| Annual | 2.7 °C | 17.9 °C | 712.73 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |