Bolivar, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 13.7 °C (high). Annual precipitation averages 1096.3 Millimeters. Bolivar is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | -0.3 °C | 73.66 mm |
| February | -9.9 °C | 1.2 °C | 55.12 mm |
| March | -6.2 °C | 5.8 °C | 74.93 mm |
| April | -0.4 °C | 13.3 °C | 92.46 mm |
| May | 5.6 °C | 20.3 °C | 95 mm |
| June | 10.5 °C | 24.4 °C | 115.32 mm |
| July | 12.9 °C | 26.6 °C | 111 mm |
| August | 12.4 °C | 25.7 °C | 109.73 mm |
| September | 8.6 °C | 21.9 °C | 102.87 mm |
| October | 2.7 °C | 15.2 °C | 101.6 mm |
| November | -2.1 °C | 8.2 °C | 81.03 mm |
| December | -6.4 °C | 2.2 °C | 83.57 mm |
| Annual | 1.5 °C | 13.7 °C | 1096.29 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |