Westbrook, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.6 °C (low) to 12.6 °C (high). Annual precipitation averages 752.8 Millimeters. Westbrook is located in USDA Plant Hardiness Zone 5a. 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 | -14.5 °C | -4.9 °C | 17.02 mm |
| February | -12.3 °C | -2.5 °C | 19.3 mm |
| March | -5.8 °C | 4.2 °C | 39.62 mm |
| April | 0.9 °C | 12.8 °C | 74.93 mm |
| May | 8.2 °C | 20.1 °C | 103.89 mm |
| June | 14.4 °C | 25.8 °C | 116.33 mm |
| July | 16.4 °C | 27.7 °C | 91.44 mm |
| August | 14.8 °C | 26.4 °C | 90.17 mm |
| September | 10.1 °C | 22.8 °C | 84.58 mm |
| October | 2.7 °C | 14.9 °C | 59.18 mm |
| November | -4.6 °C | 5.5 °C | 32 mm |
| December | -11.1 °C | -2.2 °C | 24.38 mm |
| Annual | 1.6 °C | 12.6 °C | 752.84 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |