Thayne, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.1 °C (low) to 12.4 °C (high). Annual precipitation averages 546.9 Millimeters. Thayne is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.4 °C | -1.5 °C | 57.66 mm |
| February | -12.4 °C | 0.4 °C | 49.28 mm |
| March | -7.8 °C | 5.6 °C | 42.93 mm |
| April | -3.1 °C | 10.3 °C | 53.85 mm |
| May | 1.4 °C | 16.8 °C | 64.77 mm |
| June | 4.3 °C | 22.1 °C | 48.51 mm |
| July | 7.2 °C | 27.6 °C | 23.62 mm |
| August | 6.6 °C | 27.2 °C | 28.96 mm |
| September | 2.2 °C | 22.2 °C | 40.39 mm |
| October | -2 °C | 13.8 °C | 43.69 mm |
| November | -7.3 °C | 5.1 °C | 44.45 mm |
| December | -12.4 °C | -1.4 °C | 48.77 mm |
| Annual | -3.1 °C | 12.4 °C | 546.88 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |