Grenfell, Saskatchewan climate data is summarized below. Average annual temperatures range from -3 °C (low) to 8 °C (high). Annual precipitation averages 449 Millimeters. Grenfell is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.71 °C | -9.26 °C | 0 mm |
| February | -18.8 °C | -8.84 °C | 0 mm |
| March | -10.77 °C | -0.47 °C | 0 mm |
| April | -2.9 °C | 8.73 °C | 22 mm |
| May | 3.74 °C | 16.62 °C | 59 mm |
| June | 9.83 °C | 21.2 °C | 147 mm |
| July | 12.42 °C | 24.31 °C | 89 mm |
| August | 10.61 °C | 23.59 °C | 58 mm |
| September | 5.58 °C | 19.04 °C | 47 mm |
| October | -0.31 °C | 10.32 °C | 27 mm |
| November | -8.74 °C | 0.34 °C | 0 mm |
| December | -17.67 °C | -9.21 °C | 0 mm |
| Annual | -3 °C | 8 °C | 449 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |