Lorimor, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.5 °F (low) to 60.1 °F (high). Annual precipitation averages 36.2 Inches. Lorimor 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.8 °F | 30.9 °F | 0.98 in. |
| February | 17.0 °F | 36.0 °F | 1.35 in. |
| March | 27.4 °F | 48.7 °F | 2.1 in. |
| April | 38.4 °F | 61.3 °F | 3.69 in. |
| May | 50.2 °F | 71.2 °F | 5.48 in. |
| June | 60.4 °F | 80.6 °F | 4.77 in. |
| July | 64.4 °F | 84.7 °F | 4.18 in. |
| August | 62.1 °F | 83.2 °F | 3.95 in. |
| September | 53.1 °F | 76.1 °F | 3.61 in. |
| October | 40.8 °F | 63.8 °F | 2.53 in. |
| November | 28.8 °F | 48.7 °F | 2.06 in. |
| December | 18.4 °F | 35.8 °F | 1.45 in. |
| Annual | 39.5 °F | 60.1 °F | 36.15 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |