Marmora, Ontario climate data is summarized below. Average annual temperatures range from 1.4 °C (low) to 12.7 °C (high). Annual precipitation averages 535 Millimeters. Marmora is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.64 °C | -2.86 °C | 5 mm |
| February | -13.48 °C | -2.5 °C | 0 mm |
| March | -7.2 °C | 4.28 °C | 23 mm |
| April | 0.34 °C | 12.64 °C | 42 mm |
| May | 6.8 °C | 20.21 °C | 64 mm |
| June | 12.22 °C | 24.52 °C | 88 mm |
| July | 14.46 °C | 27.13 °C | 102 mm |
| August | 13.54 °C | 26.11 °C | 81 mm |
| September | 8.73 °C | 21.66 °C | 50 mm |
| October | 3.84 °C | 14.18 °C | 39 mm |
| November | -2.22 °C | 7.05 °C | 24 mm |
| December | -7.98 °C | -0.18 °C | 17 mm |
| Annual | 1.4 °C | 12.7 °C | 535 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |