Based on the weather in Idaho Falls, Idaho, United States Of America as of May 29, 2016 5:22am local time

Why? Because it's cold. simple as that.
Current Conditions
Temp: 38.3°F3.5°C
Wind: 1.5 MPH2.5 KPH
Precipitation: None

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes