Yes

Based on the weather in Bartlesville Muni Airport, 401 Wiley Post Rd, Bartlesville, OK 74003, USA as of October 17, 2017 4:39am local time

Why? Because it's cold. simple as that.
Current Conditions
Clear
Temp: 41°F5°C
Wind: 1.5 MPH2.4 KPH
Precipitation: None