| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 6b: -5°F to 0°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 20c - Semiarid Benchlands and Canyonlands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 81647 - New Castle, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 19 | 26 | 31 | 39 | 45 | 52 | 51 | 43 | 33 | 22 | 14 | 32 |
| Avg Max Temp (°F) | 36 | 44 | 52 | 60 | 70 | 80 | 86 | 84 | 77 | 64 | 46 | 38 | 61 |
| Avg Precip (In.) | 1.24 | 1.07 | 1.32 | 1.34 | 1.61 | 1.04 | 1.23 | 1.29 | 1.39 | 1.58 | 1.17 | 1.29 | 15.57 |