Riga, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 14.2 °C (high). Annual precipitation averages 865.6 Millimeters. Riga is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 0.4 °C | 62.99 mm |
| February | -7.7 °C | 1.2 °C | 44.96 mm |
| March | -3.8 °C | 5.7 °C | 64.01 mm |
| April | 2.2 °C | 13.2 °C | 76.96 mm |
| May | 8.4 °C | 20.2 °C | 76.71 mm |
| June | 13.8 °C | 24.9 °C | 78.49 mm |
| July | 16.4 °C | 27.2 °C | 86.36 mm |
| August | 15.7 °C | 26.4 °C | 82.8 mm |
| September | 11.7 °C | 22.8 °C | 73.66 mm |
| October | 5.9 °C | 15.9 °C | 80.77 mm |
| November | 0.6 °C | 9.2 °C | 70.61 mm |
| December | -4.2 °C | 3.3 °C | 67.31 mm |
| Annual | 4.3 °C | 14.2 °C | 865.63 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |