Based on the weather in Pontiac, Michigan, United States Of America as of October 25, 2016 2:37am local time

Why? Because it's cold. simple as that.
Current Conditions
Temp: 38.3°F3.5°C
Wind: 5.6 MPH9 KPH
Precipitation: None

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes