Delavan, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.8 °F (low) to 55.4 °F (high). Annual precipitation averages 33.2 Inches. Delavan 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 | 6.2 °F | 23.5 °F | 0.82 in. |
| February | 10.3 °F | 28.0 °F | 0.88 in. |
| March | 22.9 °F | 40.5 °F | 1.76 in. |
| April | 35.1 °F | 56.4 °F | 3.12 in. |
| May | 47.8 °F | 69.2 °F | 4.38 in. |
| June | 58.8 °F | 79.2 °F | 5.2 in. |
| July | 62.1 °F | 82.4 °F | 4.27 in. |
| August | 59.5 °F | 79.9 °F | 4.08 in. |
| September | 51.0 °F | 73.9 °F | 3.39 in. |
| October | 38.0 °F | 60.0 °F | 2.62 in. |
| November | 25.0 °F | 42.8 °F | 1.49 in. |
| December | 13.2 °F | 28.9 °F | 1.14 in. |
| Annual | 35.8 °F | 55.4 °F | 33.15 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 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |