Based on the weather in Idaho Falls, Idaho, United States Of America as of October 27, 2016 10:23pm local time

Why? Because it's not very warm out.
Current Conditions
Mostly Cloudy
Temp: 54.5°F12.5°C
Wind: 1.7 MPH2.8 KPH
Precipitation: None

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes