Orleans, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 44.6 °F (low) to 57.5 °F (high). Annual precipitation averages 46.5 Inches. Orleans is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.4 °F | 38.4 °F | 4.06 in. |
| February | 26.2 °F | 38.9 °F | 3.48 in. |
| March | 31.1 °F | 43.7 °F | 4.51 in. |
| April | 39.6 °F | 52.2 °F | 4.22 in. |
| May | 48.5 °F | 61.6 °F | 3.26 in. |
| June | 57.6 °F | 71.0 °F | 3.32 in. |
| July | 64.7 °F | 77.8 °F | 2.75 in. |
| August | 64.2 °F | 77.1 °F | 3.66 in. |
| September | 58.5 °F | 71.3 °F | 3.96 in. |
| October | 48.5 °F | 61.3 °F | 4.54 in. |
| November | 39.3 °F | 52.1 °F | 4.09 in. |
| December | 31.5 °F | 44.3 °F | 4.66 in. |
| Annual | 44.6 °F | 57.5 °F | 46.51 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |