Langlois, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 45.6 °F (low) to 60.9 °F (high). Annual precipitation averages 70.3 Inches. Langlois is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.8 °F | 54.3 °F | 11.58 in. |
| February | 40.5 °F | 54.8 °F | 8.73 in. |
| March | 41.3 °F | 55.2 °F | 9.07 in. |
| April | 42.9 °F | 58.1 °F | 6.86 in. |
| May | 46.5 °F | 61.8 °F | 3.48 in. |
| June | 49.8 °F | 64.8 °F | 1.96 in. |
| July | 52.3 °F | 68.1 °F | 0.36 in. |
| August | 52.2 °F | 69.0 °F | 0.58 in. |
| September | 50.2 °F | 68.7 °F | 1.51 in. |
| October | 46.9 °F | 64.6 °F | 4.33 in. |
| November | 43.4 °F | 57.4 °F | 9.32 in. |
| December | 40.7 °F | 53.9 °F | 12.54 in. |
| Annual | 45.6 °F | 60.9 °F | 70.32 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |