| 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 6a: -10°F to -5°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: | Aug. 21 - Aug. 31 |
| Average Last Frost Date: | Jun. 21 - Jun. 30 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 18d - Foothill Shrublands and Low Mountains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 82930 - Evanston, WY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 12 | 19 | 26 | 34 | 41 | 46 | 46 | 38 | 29 | 19 | 11 | 28 |
| Avg Max Temp (°F) | 30 | 34 | 42 | 52 | 62 | 72 | 79 | 78 | 68 | 57 | 41 | 32 | 54 |
| Avg Precip (In.) | .77 | .75 | .98 | 1.26 | 1.56 | .99 | .95 | .96 | 1.33 | 1.24 | .93 | .76 | 12.47 |