Riverdale, Utah has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 17 °C (high). Annual precipitation averages 471.4 Millimeters. Riverdale is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 2.6 °C | 50.55 mm |
| February | -3.8 °C | 5.6 °C | 42.42 mm |
| March | 0.4 °C | 11.4 °C | 46.99 mm |
| April | 3.7 °C | 15.7 °C | 57.4 mm |
| May | 8.3 °C | 21.2 °C | 59.18 mm |
| June | 12.6 °C | 27.3 °C | 29.46 mm |
| July | 17.3 °C | 32.7 °C | 10.92 mm |
| August | 16.4 °C | 31.7 °C | 18.29 mm |
| September | 11.1 °C | 25.7 °C | 32.26 mm |
| October | 4.7 °C | 17.5 °C | 45.72 mm |
| November | -1 °C | 9.3 °C | 36.83 mm |
| December | -5.4 °C | 2.8 °C | 41.4 mm |
| Annual | 4.9 °C | 17 °C | 471.42 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |