Gary, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.1 °F (low) to 50.1 °F (high). Annual precipitation averages 24.5 Inches. Gary 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °F | 15.6 °F | 0.78 in. |
| February | 1.1 °F | 20.3 °F | 0.69 in. |
| March | 15.8 °F | 33.7 °F | 0.98 in. |
| April | 30.5 °F | 51.1 °F | 1.43 in. |
| May | 42.8 °F | 65.8 °F | 3.07 in. |
| June | 54.1 °F | 75.1 °F | 4.32 in. |
| July | 57.8 °F | 79.4 °F | 3.36 in. |
| August | 55.1 °F | 78.6 °F | 2.96 in. |
| September | 46.3 °F | 69.8 °F | 2.88 in. |
| October | 34.1 °F | 54.0 °F | 2.25 in. |
| November | 19.7 °F | 36.2 °F | 0.89 in. |
| December | 5.8 °F | 22.0 °F | 0.89 in. |
| Annual | 30.1 °F | 50.1 °F | 24.5 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |