Meriden, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.7 °F (low) to 57.2 °F (high). Annual precipitation averages 31.4 Inches. Meriden is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.4 °F | 26.4 °F | 0.69 in. |
| February | 12.5 °F | 30.9 °F | 0.86 in. |
| March | 24.3 °F | 44.1 °F | 1.7 in. |
| April | 35.4 °F | 58.3 °F | 3.26 in. |
| May | 48.2 °F | 70.0 °F | 4.24 in. |
| June | 59.2 °F | 80.0 °F | 5.12 in. |
| July | 62.8 °F | 83.1 °F | 3.49 in. |
| August | 60.1 °F | 80.7 °F | 4.09 in. |
| September | 51.1 °F | 74.8 °F | 3.2 in. |
| October | 38.4 °F | 61.5 °F | 2.29 in. |
| November | 25.3 °F | 44.9 °F | 1.45 in. |
| December | 14.4 °F | 31.4 °F | 0.96 in. |
| Annual | 36.7 °F | 57.2 °F | 31.35 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |