Sac City, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 14.3 °C (high). Annual precipitation averages 829.3 Millimeters. Sac City 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 | -12.9 °C | -2.9 °C | 19.56 mm |
| February | -10.7 °C | -0.4 °C | 24.13 mm |
| March | -4.2 °C | 7.2 °C | 48.01 mm |
| April | 1.9 °C | 14.9 °C | 89.15 mm |
| May | 8.8 °C | 21.2 °C | 113.79 mm |
| June | 14.9 °C | 26.8 °C | 129.54 mm |
| July | 17.1 °C | 28.6 °C | 92.71 mm |
| August | 15.5 °C | 27.3 °C | 109.73 mm |
| September | 10.2 °C | 24.1 °C | 74.93 mm |
| October | 3.4 °C | 16.6 °C | 59.94 mm |
| November | -3.7 °C | 7.6 °C | 38.35 mm |
| December | -9.5 °C | 0 °C | 29.46 mm |
| Annual | 2.6 °C | 14.3 °C | 829.3 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |