Marmora, Ontario climate data is summarized below. Average annual temperatures range from 34.4 °F (low) to 54.8 °F (high). Annual precipitation averages 21.1 Inches. 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 | -24.8 °F | -19.4 °F | 127 in. |
| February | -25.3 °F | -19.2 °F | 0 in. |
| March | -21.8 °F | -15.4 °F | 584.2 in. |
| April | -17.6 °F | -10.8 °F | 1066.8 in. |
| May | -14 °F | -6.6 °F | 1625.6 in. |
| June | -11 °F | -4.2 °F | 2235.2 in. |
| July | -9.7 °F | -2.7 °F | 2590.8 in. |
| August | -10.3 °F | -3.3 °F | 2057.4 in. |
| September | -12.9 °F | -5.7 °F | 1270 in. |
| October | -15.6 °F | -9.9 °F | 990.6 in. |
| November | -19 °F | -13.9 °F | 609.6 in. |
| December | -22.2 °F | -17.9 °F | 431.8 in. |
| Annual | 34.4 °F | 54.8 °F | 21.07 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |