Essex, Ontario climate data is summarized below. Average annual temperatures range from 5.7 °C (low) to 14.4 °C (high). Annual precipitation averages 579 Millimeters. 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 | -7.43 °C | -0.84 °C | 20 mm |
| February | -8.03 °C | -0.81 °C | 12 mm |
| March | -1.82 °C | 7.01 °C | 42 mm |
| April | 3.88 °C | 14.24 °C | 58 mm |
| May | 10.38 °C | 21 °C | 67 mm |
| June | 16.16 °C | 26.1 °C | 68 mm |
| July | 18.39 °C | 28.09 °C | 62 mm |
| August | 17.71 °C | 27.06 °C | 59 mm |
| September | 13.16 °C | 22.83 °C | 71 mm |
| October | 7.52 °C | 16.16 °C | 42 mm |
| November | 1.31 °C | 8.87 °C | 46 mm |
| December | -3.33 °C | 2.43 °C | 32 mm |
| Annual | 5.7 °C | 14.4 °C | 579 mm |
| 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 : -17.8°C to -15°C |
| Current Drought Conditions | Normal |