Logan, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.9 °F (low) to 60.7 °F (high). Annual precipitation averages 33.6 Inches. Logan 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 | 11.9 °F | 31.0 °F | 0.74 in. |
| February | 15.7 °F | 35.9 °F | 0.96 in. |
| March | 26.8 °F | 49.0 °F | 1.86 in. |
| April | 37.7 °F | 61.9 °F | 3.32 in. |
| May | 50.2 °F | 72.5 °F | 4.93 in. |
| June | 60.9 °F | 82.4 °F | 5.18 in. |
| July | 64.7 °F | 85.7 °F | 3.88 in. |
| August | 62.0 °F | 83.6 °F | 4.2 in. |
| September | 52.6 °F | 77.5 °F | 3.25 in. |
| October | 39.9 °F | 64.6 °F | 2.54 in. |
| November | 27.1 °F | 48.8 °F | 1.42 in. |
| December | 16.9 °F | 35.4 °F | 1.3 in. |
| Annual | 38.9 °F | 60.7 °F | 33.58 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |