Fort Laramie, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.5 °C (low) to 17.6 °C (high). Annual precipitation averages 361.5 Millimeters. Fort Laramie is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | 5.3 °C | 5.84 mm |
| February | -9.1 °C | 6.4 °C | 11.43 mm |
| March | -4.7 °C | 11.8 °C | 19.3 mm |
| April | -0.7 °C | 15.8 °C | 44.96 mm |
| May | 5 °C | 21.1 °C | 69.09 mm |
| June | 10.2 °C | 27.7 °C | 55.63 mm |
| July | 13.6 °C | 32.1 °C | 41.15 mm |
| August | 12.2 °C | 31.1 °C | 34.8 mm |
| September | 6.6 °C | 26.2 °C | 28.45 mm |
| October | -0.4 °C | 18.1 °C | 29.21 mm |
| November | -6.2 °C | 10.5 °C | 11.43 mm |
| December | -10.2 °C | 5.2 °C | 10.16 mm |
| Annual | 0.5 °C | 17.6 °C | 361.45 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |