Rumford, Maine has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 33.7 °F (low) to 54.1 °F (high). Annual precipitation averages 46.7 Inches. Rumford is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.9 °F | 27.1 °F | 3.05 in. |
| February | 9.8 °F | 30.0 °F | 2.41 in. |
| March | 19.5 °F | 38.9 °F | 3.17 in. |
| April | 31.5 °F | 52.1 °F | 4.16 in. |
| May | 42.3 °F | 65.2 °F | 3.93 in. |
| June | 51.9 °F | 74.0 °F | 5.04 in. |
| July | 57.2 °F | 79.1 °F | 4.23 in. |
| August | 55.1 °F | 77.8 °F | 4.06 in. |
| September | 47.2 °F | 70.5 °F | 3.35 in. |
| October | 36.8 °F | 57.2 °F | 5.21 in. |
| November | 27.1 °F | 44.2 °F | 4.3 in. |
| December | 17.1 °F | 32.9 °F | 3.75 in. |
| Annual | 33.7 °F | 54.1 °F | 46.66 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |