Rochester, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 15.4 °C (high). Annual precipitation averages 960.9 Millimeters. Rochester is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.6 °C | -1.3 °C | 34.04 mm |
| February | -8.5 °C | 1.2 °C | 40.13 mm |
| March | -2.4 °C | 8.4 °C | 59.69 mm |
| April | 3.8 °C | 16.2 °C | 94.23 mm |
| May | 10.4 °C | 22.3 °C | 120.14 mm |
| June | 16 °C | 27.4 °C | 130.05 mm |
| July | 17.8 °C | 29.1 °C | 108.46 mm |
| August | 16.4 °C | 28.2 °C | 106.43 mm |
| September | 11.8 °C | 24.9 °C | 91.19 mm |
| October | 5.2 °C | 17.7 °C | 75.18 mm |
| November | -1.4 °C | 9.1 °C | 56.39 mm |
| December | -7.2 °C | 1.7 °C | 44.96 mm |
| Annual | 4.3 °C | 15.4 °C | 960.89 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |