Maybe I’m biased because of where I live (the United States in the upper Midwest). The coldest winter night will usually be around -30 to -20°F, and the hottest summer day will usually be just over 100°F. But most days of the year fall between 0°F and 100°F, so Fahrenheit just seems to work well. 0 is a cold winter day, and 100 is a hot summer day.