Weston, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 17.7 °C (high). Annual precipitation averages 442 Millimeters. Weston is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.4 °C | 7.1 °C | 16.51 mm |
| February | -7.9 °C | 8.6 °C | 16.76 mm |
| March | -4.3 °C | 12.7 °C | 31.75 mm |
| April | -0.8 °C | 16.2 °C | 39.37 mm |
| May | 4.1 °C | 21.3 °C | 48.26 mm |
| June | 8.8 °C | 27.1 °C | 36.07 mm |
| July | 11.7 °C | 29 °C | 69.6 mm |
| August | 10.9 °C | 27.9 °C | 75.18 mm |
| September | 6.8 °C | 24.6 °C | 37.34 mm |
| October | 0.7 °C | 19 °C | 28.45 mm |
| November | -5.1 °C | 12.2 °C | 22.35 mm |
| December | -9.2 °C | 6.9 °C | 20.32 mm |
| Annual | 0.5 °C | 17.7 °C | 441.96 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |