| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 58o - Northern Connecticut Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03784 - West Lebanon, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 10 | 21 | 31 | 42 | 52 | 57 | 55 | 47 | 36 | 27 | 15 | 33 |
| Avg Max Temp (°F) | 29 | 33 | 42 | 55 | 69 | 77 | 81 | 79 | 70 | 58 | 45 | 33 | 56 |
| Avg Precip (In.) | 3.01 | 2.31 | 2.81 | 3.01 | 3.52 | 3.26 | 3.61 | 3.76 | 3.6 | 3.51 | 3.38 | 2.89 | 38.66 |