Monrovia, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 16.8 °C (high). Annual precipitation averages 1156.2 Millimeters. Monrovia is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2 °C | 79.5 mm |
| February | -5.2 °C | 4.4 °C | 66.04 mm |
| March | -0.3 °C | 10.4 °C | 87.12 mm |
| April | 5.5 °C | 17.2 °C | 121.92 mm |
| May | 11.5 °C | 22.7 °C | 127.25 mm |
| June | 16.6 °C | 27.4 °C | 133.6 mm |
| July | 18.2 °C | 29 °C | 113.28 mm |
| August | 17.2 °C | 28.4 °C | 81.28 mm |
| September | 13.2 °C | 25.4 °C | 89.41 mm |
| October | 6.6 °C | 18.6 °C | 87.63 mm |
| November | 0.8 °C | 10.9 °C | 89.41 mm |
| December | -3.8 °C | 4.6 °C | 79.76 mm |
| Annual | 6.1 °C | 16.8 °C | 1156.2 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |