Upton, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.1 °C (low) to 14.9 °C (high). Annual precipitation averages 411.5 Millimeters. Upton is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.8 °C | 1.3 °C | 11.68 mm |
| February | -10.5 °C | 2.6 °C | 12.19 mm |
| March | -5.4 °C | 8.6 °C | 19.05 mm |
| April | -1.1 °C | 13.4 °C | 44.7 mm |
| May | 4.3 °C | 18.5 °C | 77.22 mm |
| June | 9.7 °C | 25.2 °C | 63.75 mm |
| July | 13.6 °C | 30.6 °C | 51.56 mm |
| August | 12.4 °C | 30 °C | 36.32 mm |
| September | 6.9 °C | 24.2 °C | 30.23 mm |
| October | 0.1 °C | 15.4 °C | 38.35 mm |
| November | -6.2 °C | 7.5 °C | 13.72 mm |
| December | -11.3 °C | 1.5 °C | 12.7 mm |
| Annual | 0.1 °C | 14.9 °C | 411.47 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |