Erin, Ontario climate data is summarized below. Average annual temperatures range from 36.7 °F (low) to 53.4 °F (high). Annual precipitation averages 31.8 Inches. Erin is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -23.4 °F | -19.4 °F | 228.6 in. |
| February | -24 °F | -19.5 °F | 127 in. |
| March | -20.9 °F | -15.7 °F | 965.2 in. |
| April | -17.3 °F | -11.4 °F | 1930.4 in. |
| May | -13.7 °F | -7.4 °F | 2844.8 in. |
| June | -10.9 °F | -4.9 °F | 2921 in. |
| July | -9.5 °F | -3.4 °F | 2921 in. |
| August | -9.9 °F | -3.9 °F | 3098.8 in. |
| September | -12.1 °F | -6.2 °F | 1828.8 in. |
| October | -15.1 °F | -10.2 °F | 1727.2 in. |
| November | -18.3 °F | -14 °F | 1143 in. |
| December | -21.1 °F | -17.9 °F | 787.4 in. |
| Annual | 36.7 °F | 53.4 °F | 31.81 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |