This is from U.S. Department of Energy:
Cold weather and winter driving conditions can reduce your fuel economy significantly.
Fuel economy tests show that, in short-trip city driving, a conventional gasoline car's gas mileage is about 12% lower at 20°F than it would be at 77°F. It can drop as much as 22% for very short trips (3 to 4 miles).
The effect on hybrids is worse. Their fuel economy can drop about 31% to 34% under these conditions.
Source: https://www.fueleconomy.gov/feg/coldweather.shtml