Tripoli, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.5 °C (low) to 13.7 °C (high). Annual precipitation averages 978.7 Millimeters. Tripoli 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 | -13.2 °C | -3.7 °C | 28.45 mm |
| February | -10.9 °C | -1.3 °C | 27.94 mm |
| March | -4.3 °C | 6.1 °C | 51.05 mm |
| April | 2.1 °C | 14.4 °C | 101.85 mm |
| May | 8.9 °C | 21.1 °C | 130.56 mm |
| June | 14.8 °C | 26.4 °C | 152.65 mm |
| July | 16.6 °C | 28.1 °C | 119.89 mm |
| August | 15.1 °C | 27.1 °C | 105.16 mm |
| September | 10.3 °C | 23.6 °C | 96.52 mm |
| October | 3.5 °C | 16.1 °C | 73.66 mm |
| November | -3.3 °C | 7 °C | 50.04 mm |
| December | -9.4 °C | -0.6 °C | 40.89 mm |
| Annual | 2.5 °C | 13.7 °C | 978.66 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |