Phelps, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 10.6 °C (high). Annual precipitation averages 829.3 Millimeters. Phelps is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.6 °C | -5.7 °C | 33.78 mm |
| February | -15.2 °C | -2.9 °C | 28.19 mm |
| March | -10 °C | 3.4 °C | 41.4 mm |
| April | -2.5 °C | 10.1 °C | 70.87 mm |
| May | 4.9 °C | 17.9 °C | 87.38 mm |
| June | 10.5 °C | 23.1 °C | 102.36 mm |
| July | 12.8 °C | 25.3 °C | 105.41 mm |
| August | 11.8 °C | 24.2 °C | 87.63 mm |
| September | 7.6 °C | 19.7 °C | 94.74 mm |
| October | 1.1 °C | 11.7 °C | 85.09 mm |
| November | -5.2 °C | 3.3 °C | 50.29 mm |
| December | -11.8 °C | -3.2 °C | 42.16 mm |
| Annual | -1 °C | 10.6 °C | 829.3 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |