Gillam, Manitoba climate data is summarized below. Average annual temperatures range from 17.2 °F (low) to 35.1 °F (high). Annual precipitation averages 19.9 Inches. Gillam is located in USDA Plant Hardiness Zone 1a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -33.4 °F | -28.4 °F | 0 in. |
| February | -33 °F | -26.7 °F | 0 in. |
| March | -30 °F | -22.6 °F | 0 in. |
| April | -24.2 °F | -17.2 °F | 0 in. |
| May | -18.9 °F | -12.5 °F | 660.4 in. |
| June | -14.5 °F | -7.6 °F | 2184.4 in. |
| July | -11.9 °F | -5.6 °F | 3352.8 in. |
| August | -12.4 °F | -6.8 °F | 3251.2 in. |
| September | -15 °F | -10.3 °F | 2387.6 in. |
| October | -18.3 °F | -15.5 °F | 1016 in. |
| November | -25.1 °F | -21.5 °F | 0 in. |
| December | -31.2 °F | -27.3 °F | 0 in. |
| Annual | 17.2 °F | 35.1 °F | 19.92 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 1a : -60°F to -55°F |
| Current Drought Conditions | Normal |