Collins, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.6 °C (low) to 14.8 °C (high). Annual precipitation averages 935.5 Millimeters. Collins is located in USDA Plant Hardiness Zone 5b. 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 | -11.7 °C | -2.1 °C | 24.64 mm |
| February | -9.5 °C | 0.6 °C | 29.21 mm |
| March | -3.2 °C | 7.8 °C | 52.58 mm |
| April | 3.1 °C | 15.6 °C | 95.5 mm |
| May | 9.9 °C | 21.4 °C | 129.79 mm |
| June | 15.8 °C | 26.9 °C | 139.7 mm |
| July | 17.7 °C | 28.7 °C | 112.27 mm |
| August | 16.3 °C | 27.6 °C | 111.51 mm |
| September | 11.3 °C | 24.3 °C | 89.41 mm |
| October | 4.4 °C | 16.8 °C | 66.04 mm |
| November | -2.4 °C | 8.4 °C | 48.26 mm |
| December | -8.3 °C | 1 °C | 36.58 mm |
| Annual | 3.6 °C | 14.8 °C | 935.49 mm |
| 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 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 |