Geraldton, Ontario climate data is summarized below. Average annual temperatures range from 24.6 °F (low) to 44 °F (high). Annual precipitation averages 23.2 Inches. Geraldton is located in USDA Plant Hardiness Zone 2b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -30.3 °F | -24.3 °F | 0 in. |
| February | -30.6 °F | -23.3 °F | 0 in. |
| March | -26 °F | -18.6 °F | 0 in. |
| April | -21 °F | -14.4 °F | 228.6 in. |
| May | -16.4 °F | -9.7 °F | 2387.6 in. |
| June | -12.9 °F | -6.4 °F | 2946.4 in. |
| July | -11 °F | -5.1 °F | 2743.2 in. |
| August | -11.4 °F | -5.4 °F | 2413 in. |
| September | -14.3 °F | -8.5 °F | 2387.6 in. |
| October | -17.3 °F | -13 °F | 1803.4 in. |
| November | -21.6 °F | -17.5 °F | 50.8 in. |
| December | -27.8 °F | -22.8 °F | 0 in. |
| Annual | 24.6 °F | 44 °F | 23.19 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 2b : -45°F to -40°F |
| Current Drought Conditions | Normal |