Jay, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.7 °F (low) to 54 °F (high). Annual precipitation averages 49 Inches. Jay 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 | 8.4 °F | 27.1 °F | 3.42 in. |
| February | 9.5 °F | 30.0 °F | 3.12 in. |
| March | 19.4 °F | 38.8 °F | 3.64 in. |
| April | 31.4 °F | 52.1 °F | 4.2 in. |
| May | 42.4 °F | 65.0 °F | 3.69 in. |
| June | 52.0 °F | 73.4 °F | 5.17 in. |
| July | 57.3 °F | 78.8 °F | 4.07 in. |
| August | 55.4 °F | 77.8 °F | 3.74 in. |
| September | 47.4 °F | 70.4 °F | 3.62 in. |
| October | 37.0 °F | 57.1 °F | 5.55 in. |
| November | 27.2 °F | 44.3 °F | 4.34 in. |
| December | 16.7 °F | 33.1 °F | 4.42 in. |
| Annual | 33.7 °F | 54 °F | 48.98 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |