Rensselaer, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 63.9 °F (high). Annual precipitation averages 39.7 Inches. Rensselaer is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.0 °F | 36.1 °F | 1.92 in. |
| February | 22.4 °F | 41.0 °F | 2.13 in. |
| March | 32.1 °F | 52.7 °F | 2.73 in. |
| April | 43.0 °F | 64.8 °F | 4.2 in. |
| May | 53.7 °F | 74.7 °F | 4.9 in. |
| June | 63.4 °F | 83.6 °F | 4.54 in. |
| July | 66.9 °F | 87.5 °F | 4.09 in. |
| August | 64.8 °F | 86.1 °F | 3.72 in. |
| September | 56.3 °F | 79.6 °F | 3.5 in. |
| October | 44.8 °F | 67.1 °F | 3.19 in. |
| November | 33.6 °F | 52.8 °F | 2.69 in. |
| December | 24.3 °F | 40.6 °F | 2.05 in. |
| Annual | 43.7 °F | 63.9 °F | 39.66 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |