Metcalfe, Ontario climate data is summarized below. Average annual temperatures range from 35.8 °F (low) to 53.5 °F (high). Annual precipitation averages 17.1 Inches. Metcalfe 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 | -25.1 °F | -20.3 °F | 0 in. |
| February | -25 °F | -19.9 °F | 0 in. |
| March | -21.4 °F | -16 °F | 355.6 in. |
| April | -16.9 °F | -11 °F | 965.2 in. |
| May | -13.3 °F | -6.7 °F | 1193.8 in. |
| June | -10.5 °F | -4.4 °F | 1473.2 in. |
| July | -9.1 °F | -3 °F | 2387.6 in. |
| August | -9.6 °F | -3.5 °F | 2032 in. |
| September | -12.3 °F | -6 °F | 1193.8 in. |
| October | -15.3 °F | -10.2 °F | 838.2 in. |
| November | -18.6 °F | -14.1 °F | 482.6 in. |
| December | -22.5 °F | -18.7 °F | 127 in. |
| Annual | 35.8 °F | 53.5 °F | 17.13 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |