Lexington, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.5 °C (low) to 17.7 °C (high). Annual precipitation averages 295.4 Millimeters. Lexington is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 5.8 °C | 33.27 mm |
| February | -1.6 °C | 8.4 °C | 26.67 mm |
| March | 0.8 °C | 12.9 °C | 29.97 mm |
| April | 3.3 °C | 16.8 °C | 29.97 mm |
| May | 6.9 °C | 21.7 °C | 35.05 mm |
| June | 10 °C | 25.6 °C | 26.16 mm |
| July | 13.2 °C | 31.2 °C | 5.84 mm |
| August | 12.8 °C | 30.8 °C | 6.6 mm |
| September | 9.1 °C | 25.7 °C | 9.65 mm |
| October | 4.2 °C | 18.1 °C | 24.64 mm |
| November | 0.2 °C | 10.3 °C | 34.04 mm |
| December | -2.6 °C | 5.2 °C | 33.53 mm |
| Annual | 4.5 °C | 17.7 °C | 295.39 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |