Clarissa, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 10.9 °C (high). Annual precipitation averages 714.8 Millimeters. Clarissa is located in USDA Plant Hardiness Zone 4a. 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 | -17.7 °C | -7.2 °C | 17.78 mm |
| February | -15.7 °C | -4.3 °C | 17.53 mm |
| March | -8.4 °C | 2.7 °C | 31.5 mm |
| April | -0.8 °C | 11.3 °C | 55.88 mm |
| May | 6.5 °C | 18.8 °C | 88.14 mm |
| June | 12.4 °C | 24 °C | 116.08 mm |
| July | 15.1 °C | 26.6 °C | 106.68 mm |
| August | 13.5 °C | 25.6 °C | 88.9 mm |
| September | 8.8 °C | 21 °C | 73.66 mm |
| October | 1.6 °C | 12.6 °C | 69.85 mm |
| November | -5.7 °C | 3.3 °C | 26.16 mm |
| December | -13.1 °C | -4.2 °C | 22.61 mm |
| Annual | -0.3 °C | 10.9 °C | 714.77 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |