Fair Oaks, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.1 °C (low) to 18.4 °C (high). Annual precipitation averages 1026.4 Millimeters. Fair Oaks is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 9.3 °C | 155.45 mm |
| February | 2 °C | 11.7 °C | 108.2 mm |
| March | 2.9 °C | 14.3 °C | 113.28 mm |
| April | 4.6 °C | 16.7 °C | 90.17 mm |
| May | 7.2 °C | 20.5 °C | 65.28 mm |
| June | 9.7 °C | 24 °C | 32.26 mm |
| July | 11.9 °C | 28.9 °C | 10.16 mm |
| August | 11.6 °C | 29.4 °C | 10.92 mm |
| September | 9.2 °C | 26.2 °C | 28.19 mm |
| October | 6.2 °C | 19.1 °C | 78.74 mm |
| November | 4 °C | 12.3 °C | 150.62 mm |
| December | 1.8 °C | 8.4 °C | 183.13 mm |
| Annual | 6.1 °C | 18.4 °C | 1026.4 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |