Blue Mounds, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 13.1 °C (high). Annual precipitation averages 1005.6 Millimeters. Blue Mounds is located in USDA Plant Hardiness Zone 5b. 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 | -12.1 °C | -3.6 °C | 38.86 mm |
| February | -9.9 °C | -1.1 °C | 39.37 mm |
| March | -4.1 °C | 5.7 °C | 53.34 mm |
| April | 2 °C | 13.6 °C | 101.85 mm |
| May | 8.6 °C | 20.1 °C | 118.11 mm |
| June | 14.1 °C | 25.2 °C | 152.91 mm |
| July | 16.6 °C | 27.2 °C | 115.32 mm |
| August | 15.6 °C | 26.3 °C | 113.54 mm |
| September | 10.8 °C | 22.3 °C | 94.49 mm |
| October | 4.3 °C | 15.3 °C | 74.68 mm |
| November | -2.1 °C | 6.7 °C | 58.42 mm |
| December | -8.2 °C | -0.4 °C | 44.7 mm |
| Annual | 3 °C | 13.1 °C | 1005.59 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |