Dayton, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.3 °F (low) to 58.8 °F (high). Annual precipitation averages 18 Inches. Dayton is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.6 °F | 36.1 °F | 0.84 in. |
| February | 13.6 °F | 38.3 °F | 0.99 in. |
| March | 21.9 °F | 48.4 °F | 1.29 in. |
| April | 30.2 °F | 55.8 °F | 2.09 in. |
| May | 39.4 °F | 64.8 °F | 3.54 in. |
| June | 48.0 °F | 75.4 °F | 2.13 in. |
| July | 53.8 °F | 85.7 °F | 1.11 in. |
| August | 51.3 °F | 84.7 °F | 0.92 in. |
| September | 42.5 °F | 73.9 °F | 1.43 in. |
| October | 31.2 °F | 59.3 °F | 1.82 in. |
| November | 20.0 °F | 46.4 °F | 1.0 in. |
| December | 12.0 °F | 36.6 °F | 0.85 in. |
| Annual | 31.3 °F | 58.8 °F | 18.01 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |