Gem Lake, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.3 °F (low) to 54.7 °F (high). Annual precipitation averages 33.9 Inches. Gem Lake 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.9 °F | 23.1 °F | 0.97 in. |
| February | 10.0 °F | 28.1 °F | 0.92 in. |
| March | 22.1 °F | 40.9 °F | 1.74 in. |
| April | 35.3 °F | 55.5 °F | 3.14 in. |
| May | 47.9 °F | 68.3 °F | 4.28 in. |
| June | 58.3 °F | 77.9 °F | 4.78 in. |
| July | 63.1 °F | 82.3 °F | 4.36 in. |
| August | 60.4 °F | 80.1 °F | 4.39 in. |
| September | 52.1 °F | 72.4 °F | 3.44 in. |
| October | 38.9 °F | 57.7 °F | 2.94 in. |
| November | 26.1 °F | 42.0 °F | 1.66 in. |
| December | 13.9 °F | 28.4 °F | 1.31 in. |
| Annual | 36.3 °F | 54.7 °F | 33.93 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |