Based on the weather in Idaho Falls, Idaho, United States Of America as of May 5, 2016 2:32am local time

Why? Because it's not very warm out.
Current Conditions
Partly Cloudy
Temp: 50.9°F10.5°C
Wind: 2.3 MPH3.6 KPH
Precipitation: None

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes