James Town, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 28.8 °F (low) to 58.7 °F (high). Annual precipitation averages 10 Inches. James Town is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.1 °F | 33.1 °F | 0.57 in. |
| February | 11.4 °F | 36.8 °F | 0.53 in. |
| March | 21.2 °F | 47.4 °F | 0.79 in. |
| April | 27.9 °F | 56.2 °F | 1.17 in. |
| May | 36.3 °F | 66.2 °F | 1.56 in. |
| June | 44.1 °F | 78.1 °F | 0.97 in. |
| July | 50.6 °F | 86.6 °F | 0.51 in. |
| August | 48.7 °F | 84.9 °F | 0.64 in. |
| September | 39.6 °F | 75.3 °F | 1.01 in. |
| October | 29.3 °F | 60.7 °F | 1.04 in. |
| November | 19.0 °F | 45.1 °F | 0.66 in. |
| December | 9.6 °F | 33.9 °F | 0.52 in. |
| Annual | 28.8 °F | 58.7 °F | 9.97 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |