Emo, Ontario climate data is summarized below. Average annual temperatures range from -2.3 °C (low) to 9.4 °C (high). Annual precipitation averages 486 Millimeters. Emo is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.36 °C | -9.63 °C | 0 mm |
| February | -19.68 °C | -7.04 °C | 0 mm |
| March | -9.81 °C | 2.59 °C | 3 mm |
| April | -1.85 °C | 10.23 °C | 20 mm |
| May | 4.17 °C | 17.41 °C | 76 mm |
| June | 10.14 °C | 22.59 °C | 94 mm |
| July | 12.63 °C | 25.5 °C | 94 mm |
| August | 11.23 °C | 24.63 °C | 80 mm |
| September | 6.62 °C | 19.61 °C | 63 mm |
| October | 1.33 °C | 11.63 °C | 48 mm |
| November | -5.96 °C | 2.35 °C | 8 mm |
| December | -16.3 °C | -7.68 °C | 0 mm |
| Annual | -2.3 °C | 9.4 °C | 486 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |