Based on the weather in Glasgow, Glasgow City, United Kingdom as of April 29, 2016 10:38pm local time

Why? Because it's cold. simple as that.
Current Conditions
Partly Cloudy
Temp: 42.8°F6°C
Wind: 1.9 MPH3.1 KPH
Precipitation: None

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes