Weldon, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 9.1 °C (low) to 24.8 °C (high). Annual precipitation averages 272 Millimeters. Weldon is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 15.1 °C | 60.45 mm |
| February | 2.7 °C | 16.2 °C | 63.75 mm |
| March | 4.7 °C | 18.8 °C | 37.85 mm |
| April | 7 °C | 21.7 °C | 16 mm |
| May | 11.2 °C | 26.6 °C | 6.86 mm |
| June | 15.5 °C | 32.3 °C | 3.05 mm |
| July | 18.5 °C | 36.9 °C | 3.56 mm |
| August | 17.7 °C | 36.7 °C | 3.56 mm |
| September | 15.1 °C | 33.1 °C | 2.79 mm |
| October | 9.6 °C | 26.5 °C | 9.14 mm |
| November | 4.4 °C | 19.7 °C | 21.84 mm |
| December | 0.9 °C | 14.5 °C | 43.18 mm |
| Annual | 9.1 °C | 24.8 °C | 272.03 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |