Bridgeport, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.3 °C (low) to 17.1 °C (high). Annual precipitation averages 268.7 Millimeters. Bridgeport 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 1.2 °C | 40.13 mm |
| February | -3.6 °C | 5.1 °C | 26.16 mm |
| March | -0.1 °C | 12.1 °C | 26.42 mm |
| April | 3.5 °C | 17.8 °C | 16 mm |
| May | 7.8 °C | 23.4 °C | 21.34 mm |
| June | 11.2 °C | 27 °C | 21.59 mm |
| July | 14.6 °C | 32.6 °C | 11.18 mm |
| August | 14.1 °C | 32.3 °C | 5.59 mm |
| September | 9.7 °C | 26.6 °C | 7.87 mm |
| October | 4.1 °C | 17.3 °C | 18.03 mm |
| November | -0.7 °C | 7.7 °C | 28.7 mm |
| December | -4.3 °C | 1.5 °C | 45.72 mm |
| Annual | 4.3 °C | 17.1 °C | 268.73 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |