Gillam, Manitoba climate data is summarized below. Average annual temperatures range from -8.2 °C (low) to 1.7 °C (high). Annual precipitation averages 506 Millimeters. 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 | -28.13 °C | -19.07 °C | 0 mm |
| February | -27.36 °C | -16.05 °C | 0 mm |
| March | -22.04 °C | -8.6 °C | 0 mm |
| April | -11.59 °C | 1.02 °C | 0 mm |
| May | -2.08 °C | 9.45 °C | 26 mm |
| June | 5.86 °C | 18.39 °C | 86 mm |
| July | 10.66 °C | 21.9 °C | 132 mm |
| August | 9.63 °C | 19.73 °C | 128 mm |
| September | 4.95 °C | 13.44 °C | 94 mm |
| October | -0.9 °C | 4.14 °C | 40 mm |
| November | -13.2 °C | -6.69 °C | 0 mm |
| December | -24.24 °C | -17.05 °C | 0 mm |
| Annual | -8.2 °C | 1.7 °C | 506 mm |
| 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 : |
| Current Drought Conditions | Normal |