Weldona, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.8 °C (low) to 18.1 °C (high). Annual precipitation averages 378 Millimeters. Weldona is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.3 °C | 5 °C | 7.62 mm |
| February | -9.8 °C | 7.3 °C | 8.13 mm |
| March | -4.6 °C | 13.2 °C | 18.54 mm |
| April | -0.2 °C | 16.8 °C | 37.34 mm |
| May | 6 °C | 22.1 °C | 62.23 mm |
| June | 11.5 °C | 28.6 °C | 57.4 mm |
| July | 14.4 °C | 31.7 °C | 57.15 mm |
| August | 13.1 °C | 30.6 °C | 48.51 mm |
| September | 7.8 °C | 26.7 °C | 31.75 mm |
| October | 0 °C | 19.2 °C | 28.45 mm |
| November | -6.3 °C | 11 °C | 12.19 mm |
| December | -11.1 °C | 5.2 °C | 8.64 mm |
| Annual | 0.8 °C | 18.1 °C | 377.95 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |