Palo, 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 59.2 °F (high). Annual precipitation averages 38.2 Inches. Palo 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 | 11.8 °F | 28.7 °F | 1.18 in. |
| February | 15.6 °F | 33.3 °F | 1.34 in. |
| March | 26.9 °F | 46.5 °F | 2.12 in. |
| April | 38.0 °F | 61.0 °F | 3.8 in. |
| May | 49.9 °F | 71.9 °F | 4.72 in. |
| June | 60.2 °F | 81.1 °F | 5.61 in. |
| July | 63.6 °F | 84.3 °F | 4.43 in. |
| August | 61.0 °F | 82.5 °F | 4.38 in. |
| September | 52.4 °F | 76.4 °F | 3.79 in. |
| October | 40.5 °F | 63.3 °F | 2.94 in. |
| November | 28.6 °F | 47.5 °F | 2.22 in. |
| December | 18.1 °F | 34.2 °F | 1.65 in. |
| Annual | 38.9 °F | 59.2 °F | 38.18 in. |
| 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 : -20°F to -15°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 |