Fairmont, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.2 °F (low) to 55.3 °F (high). Annual precipitation averages 32.5 Inches. Fairmont is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.9 °F | 23.6 °F | 0.85 in. |
| February | 10.9 °F | 27.9 °F | 0.95 in. |
| March | 23.3 °F | 40.5 °F | 1.82 in. |
| April | 35.3 °F | 56.1 °F | 3.3 in. |
| May | 48.2 °F | 68.9 °F | 4.46 in. |
| June | 59.2 °F | 79.0 °F | 4.85 in. |
| July | 62.6 °F | 82.2 °F | 4.0 in. |
| August | 59.8 °F | 79.6 °F | 3.69 in. |
| September | 51.2 °F | 74.1 °F | 3.35 in. |
| October | 38.4 °F | 59.6 °F | 2.52 in. |
| November | 25.1 °F | 42.9 °F | 1.49 in. |
| December | 13.5 °F | 28.9 °F | 1.25 in. |
| Annual | 36.2 °F | 55.3 °F | 32.53 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |