| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 43g - Semiarid Pierre Shale Plains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 82701 - Newcastle, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 14 | 23 | 32 | 42 | 51 | 57 | 56 | 45 | 34 | 21 | 12 | 33 |
| Avg Max Temp (°F) | 32 | 38 | 47 | 57 | 67 | 79 | 86 | 84 | 73 | 60 | 43 | 34 | 58 |
| Avg Precip (In.) | .46 | .59 | .78 | 1.69 | 2.64 | 2.51 | 2.14 | 1.87 | 1.18 | 1.34 | .71 | .59 | 16.5 |