Slater, Wyoming has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.2 °C (low) to 16.4 °C (high). Annual precipitation averages 400.8 Millimeters. Slater 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 | -8.3 °C | 4.7 °C | 10.16 mm |
| February | -7.7 °C | 5.4 °C | 15.24 mm |
| March | -3.8 °C | 10.5 °C | 23.37 mm |
| April | -0.3 °C | 14 °C | 49.02 mm |
| May | 4.8 °C | 19.3 °C | 74.93 mm |
| June | 9.9 °C | 25.7 °C | 52.58 mm |
| July | 13.3 °C | 30.9 °C | 41.66 mm |
| August | 12 °C | 29.9 °C | 35.56 mm |
| September | 6.8 °C | 25.1 °C | 34.54 mm |
| October | 0.3 °C | 17.1 °C | 31.75 mm |
| November | -4.7 °C | 9.4 °C | 16.26 mm |
| December | -7.8 °C | 4.6 °C | 15.75 mm |
| Annual | 1.2 °C | 16.4 °C | 400.82 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |