Karlstad, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.9 °F (low) to 48.9 °F (high). Annual precipitation averages 23.6 Inches. Karlstad 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.4 °F | 13.6 °F | 0.58 in. |
| February | -2.5 °F | 18.2 °F | 0.48 in. |
| March | 12.5 °F | 32.5 °F | 0.74 in. |
| April | 28.5 °F | 50.2 °F | 1.18 in. |
| May | 41.6 °F | 64.9 °F | 3.09 in. |
| June | 52.8 °F | 74.8 °F | 4.3 in. |
| July | 56.1 °F | 78.9 °F | 3.78 in. |
| August | 53.1 °F | 78.4 °F | 2.94 in. |
| September | 44.3 °F | 69.2 °F | 2.68 in. |
| October | 32.6 °F | 52.4 °F | 2.04 in. |
| November | 17.8 °F | 34.2 °F | 1.02 in. |
| December | 3.2 °F | 19.5 °F | 0.78 in. |
| Annual | 27.9 °F | 48.9 °F | 23.61 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |