Whalan, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.3 °C (low) to 13.2 °C (high). Annual precipitation averages 919 Millimeters. Whalan is located in USDA Plant Hardiness Zone 4b. 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 | -13.7 °C | -4 °C | 27.69 mm |
| February | -11.8 °C | -1.5 °C | 27.18 mm |
| March | -4.9 °C | 5.4 °C | 48.51 mm |
| April | 1.8 °C | 13.7 °C | 99.57 mm |
| May | 8.4 °C | 20.4 °C | 113.54 mm |
| June | 14.3 °C | 25.8 °C | 149.61 mm |
| July | 16.4 °C | 27.9 °C | 105.41 mm |
| August | 15.1 °C | 26.8 °C | 112.01 mm |
| September | 10.5 °C | 22.9 °C | 90.17 mm |
| October | 3.7 °C | 15.3 °C | 64.26 mm |
| November | -2.9 °C | 6.6 °C | 45.97 mm |
| December | -9.5 °C | -0.8 °C | 35.05 mm |
| Annual | 2.3 °C | 13.2 °C | 918.97 mm |
| 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |