| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 82f - Midcoast | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04357 - Richmond, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 12 | 23 | 33 | 44 | 53 | 59 | 57 | 49 | 38 | 29 | 17 | 35 |
| Avg Max Temp (°F) | 29 | 33 | 41 | 53 | 65 | 74 | 79 | 78 | 69 | 58 | 46 | 35 | 55 |
| Avg Precip (In.) | 3.89 | 2.93 | 4.17 | 4.14 | 3.88 | 3.67 | 3.31 | 3.11 | 3.65 | 4.03 | 4.39 | 4.04 | 45.21 |