Based on the weather in Bishop, California, United States Of America as of September 4, 2015 5:21am local time

Why? Because it's pretty chilly.
Current Conditions
Temp: 50.9°F • 10.5°C
Wind: 4.1 MPH • 6.55 KPH
Precip: 0%

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes