Fraser, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 15 °C (high). Annual precipitation averages 927.6 Millimeters. Fraser is located in USDA Plant Hardiness Zone 5a. 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 | -12.1 °C | -2 °C | 24.64 mm |
| February | -9.8 °C | 0.6 °C | 30.23 mm |
| March | -3.3 °C | 7.9 °C | 52.32 mm |
| April | 3 °C | 15.9 °C | 97.03 mm |
| May | 9.6 °C | 21.8 °C | 129.79 mm |
| June | 15.4 °C | 27.1 °C | 136.91 mm |
| July | 17.4 °C | 29.1 °C | 114.05 mm |
| August | 15.9 °C | 27.9 °C | 112.27 mm |
| September | 11.2 °C | 24.6 °C | 79.5 mm |
| October | 4.2 °C | 17.3 °C | 70.61 mm |
| November | -2.6 °C | 8.6 °C | 44.45 mm |
| December | -8.6 °C | 1 °C | 35.81 mm |
| Annual | 3.4 °C | 15 °C | 927.61 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 5a : -28.9°C to -26.1°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 |