Essex, Ontario climate data is summarized below. Average annual temperatures range from 42.2 °F (low) to 57.8 °F (high). Annual precipitation averages 22.8 Inches. Essex is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.9 °F | -18.2 °F | 508 in. |
| February | -22.2 °F | -18.2 °F | 304.8 in. |
| March | -18.8 °F | -13.9 °F | 1066.8 in. |
| April | -15.6 °F | -9.9 °F | 1473.2 in. |
| May | -12 °F | -6.1 °F | 1701.8 in. |
| June | -8.8 °F | -3.3 °F | 1727.2 in. |
| July | -7.6 °F | -2.2 °F | 1574.8 in. |
| August | -7.9 °F | -2.7 °F | 1498.6 in. |
| September | -10.5 °F | -5.1 °F | 1803.4 in. |
| October | -13.6 °F | -8.8 °F | 1066.8 in. |
| November | -17.1 °F | -12.9 °F | 1168.4 in. |
| December | -19.6 °F | -16.4 °F | 812.8 in. |
| Annual | 42.2 °F | 57.8 °F | 22.79 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Normal |