Based on the weather in Custer, Washington, United States Of America as of May 25, 2016 5:50am local time

Why? Because it's not very warm out.
Current Conditions
Mostly Cloudy
Temp: 50.9°F10.5°C
Wind: 2 MPH3.3 KPH
Precipitation: None

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes