Delhi, Ontario climate data is summarized below. Average annual temperatures range from 3.7 °C (low) to 13.5 °C (high). Annual precipitation averages 543 Millimeters. Delhi is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.28 °C | -1.06 °C | 13 mm |
| February | -9.95 °C | -1.54 °C | 6 mm |
| March | -3.77 °C | 5.59 °C | 33 mm |
| April | 2.01 °C | 13.04 °C | 42 mm |
| May | 8.18 °C | 19.87 °C | 57 mm |
| June | 13.5 °C | 24.84 °C | 68 mm |
| July | 15.47 °C | 27.05 °C | 85 mm |
| August | 14.84 °C | 26.19 °C | 80 mm |
| September | 10.71 °C | 22 °C | 70 mm |
| October | 5.72 °C | 15.21 °C | 41 mm |
| November | 0.3 °C | 8.44 °C | 30 mm |
| December | -4.15 °C | 2.12 °C | 18 mm |
| Annual | 3.7 °C | 13.5 °C | 543 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |