University Place, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.3 °C (low) to 15.7 °C (high). Annual precipitation averages 1148.6 Millimeters. University Place is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 8.3 °C | 168.15 mm |
| February | 1.7 °C | 9.8 °C | 110.74 mm |
| March | 2.9 °C | 12.1 °C | 130.81 mm |
| April | 4.7 °C | 14.6 °C | 89.66 mm |
| May | 7.8 °C | 18.4 °C | 54.61 mm |
| June | 10.3 °C | 20.9 °C | 39.37 mm |
| July | 12.3 °C | 24.4 °C | 16.51 mm |
| August | 12.3 °C | 24.8 °C | 25.15 mm |
| September | 10 °C | 21.6 °C | 41.15 mm |
| October | 6.6 °C | 15.4 °C | 118.87 mm |
| November | 3.5 °C | 10.8 °C | 175.26 mm |
| December | 1.6 °C | 7.8 °C | 178.31 mm |
| Annual | 6.3 °C | 15.7 °C | 1148.59 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |