Bear River, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3 °C (low) to 12.9 °C (high). Annual precipitation averages 310.4 Millimeters. Bear River is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.1 °C | -0.6 °C | 20.57 mm |
| February | -12.2 °C | 0.8 °C | 18.03 mm |
| March | -7.2 °C | 6.2 °C | 20.57 mm |
| April | -3.5 °C | 11.2 °C | 29.97 mm |
| May | 0.7 °C | 16.7 °C | 41.4 mm |
| June | 4.4 °C | 22.9 °C | 29.72 mm |
| July | 8.2 °C | 28.2 °C | 16.76 mm |
| August | 7.4 °C | 27.4 °C | 24.38 mm |
| September | 2.8 °C | 22.1 °C | 30.48 mm |
| October | -2.7 °C | 14.6 °C | 31.24 mm |
| November | -7.8 °C | 6.1 °C | 24.64 mm |
| December | -12.8 °C | -0.3 °C | 22.61 mm |
| Annual | -3 °C | 12.9 °C | 310.37 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |