Bryant, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.3 °C (low) to 15.4 °C (high). Annual precipitation averages 1160 Millimeters. Bryant is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.7 °C | 7.6 °C | 145.8 mm |
| February | 0.6 °C | 9.2 °C | 101.35 mm |
| March | 1.8 °C | 11.4 °C | 123.44 mm |
| April | 4.3 °C | 14.7 °C | 100.33 mm |
| May | 7.3 °C | 18.2 °C | 75.18 mm |
| June | 9.7 °C | 20.3 °C | 59.18 mm |
| July | 11.3 °C | 23.9 °C | 28.7 mm |
| August | 11.3 °C | 24.5 °C | 30.23 mm |
| September | 9 °C | 21.7 °C | 59.44 mm |
| October | 5.2 °C | 15.5 °C | 118.36 mm |
| November | 2.3 °C | 10.3 °C | 165.35 mm |
| December | 0.6 °C | 7.1 °C | 152.65 mm |
| Annual | 5.3 °C | 15.4 °C | 1160.01 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |