With little precipitation and a lot of sun, Greeley is a very warm city. The hottest days occur around the third week of July with the coldest days sometime in January.
Believe it or not, Denver is a pretty warm place to live in Colorado with winters that are actually quite mild. It is also averaging 240 days of sunshine a year.
Of all the places listed, Grand Junction is one of the warmest cities that doesn’t get a ton of snow. The major reason is that it sits on Colorado’s western slope.
Pueblo is one of the largest and warmest cities in Colorado. It offers wide swings in temperature in the summer versus the winter months.
These mild temperatures make it one of the warmest places to live in Colorado, while still being able to enjoy the seasonality.