Traer, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.7 °F (low) to 58 °F (high). Annual precipitation averages 37.4 Inches. Traer 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 | 10.2 °F | 27.1 °F | 1.07 in. |
| February | 14.1 °F | 31.9 °F | 1.19 in. |
| March | 25.3 °F | 45.0 °F | 2.07 in. |
| April | 36.6 °F | 59.4 °F | 3.84 in. |
| May | 49.1 °F | 70.7 °F | 4.87 in. |
| June | 59.8 °F | 80.3 °F | 5.67 in. |
| July | 63.0 °F | 83.5 °F | 4.34 in. |
| August | 60.2 °F | 81.6 °F | 4.27 in. |
| September | 51.4 °F | 75.5 °F | 3.67 in. |
| October | 39.4 °F | 62.3 °F | 2.82 in. |
| November | 27.2 °F | 46.1 °F | 2.1 in. |
| December | 16.6 °F | 32.9 °F | 1.52 in. |
| Annual | 37.7 °F | 58 °F | 37.43 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |