Massena, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 15.6 °C (high). Annual precipitation averages 906.8 Millimeters. Massena 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | -0.8 °C | 20.32 mm |
| February | -8.9 °C | 2 °C | 29.97 mm |
| March | -2.9 °C | 9.2 °C | 47.75 mm |
| April | 3.1 °C | 16.4 °C | 87.12 mm |
| May | 9.9 °C | 22.1 °C | 138.68 mm |
| June | 15.7 °C | 27.3 °C | 128.78 mm |
| July | 17.8 °C | 29.3 °C | 107.95 mm |
| August | 16.3 °C | 28.4 °C | 105.41 mm |
| September | 11.3 °C | 24.8 °C | 93.47 mm |
| October | 4.4 °C | 17.8 °C | 70.87 mm |
| November | -2.4 °C | 9.1 °C | 44.96 mm |
| December | -8.1 °C | 1.9 °C | 31.5 mm |
| Annual | 3.8 °C | 15.6 °C | 906.78 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |