| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall |
| Ecoregion: | 58p - White Mountains/Blue Mountains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03593 - Randolph, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 6 | 16 | 28 | 40 | 49 | 53 | 51 | 43 | 33 | 24 | 11 | 30 |
| Avg Max Temp (°F) | 25 | 28 | 36 | 48 | 62 | 70 | 75 | 73 | 64 | 53 | 41 | 29 | 50 |
| Avg Precip (In.) | 4.36 | 3.46 | 4.5 | 4.45 | 4.44 | 4.95 | 4.71 | 4.94 | 4.48 | 4.71 | 4.97 | 4.37 | 54.34 |