Bethel, Maine has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 33.5 °F (low) to 53.8 °F (high). Annual precipitation averages 47.4 Inches. Bethel is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.4 °F | 26.9 °F | 3.17 in. |
| February | 9.3 °F | 30.0 °F | 2.89 in. |
| March | 19.0 °F | 38.9 °F | 3.4 in. |
| April | 31.2 °F | 52.0 °F | 4.0 in. |
| May | 42.3 °F | 65.4 °F | 3.88 in. |
| June | 51.7 °F | 73.5 °F | 4.68 in. |
| July | 57.1 °F | 78.7 °F | 4.16 in. |
| August | 55.2 °F | 77.2 °F | 4.15 in. |
| September | 47.1 °F | 70.1 °F | 3.39 in. |
| October | 36.8 °F | 56.6 °F | 5.37 in. |
| November | 27.1 °F | 44.0 °F | 4.1 in. |
| December | 16.9 °F | 32.5 °F | 4.19 in. |
| Annual | 33.5 °F | 53.8 °F | 47.38 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |