Denver is known as the Mile High City. The elevation is 5,280 feet (1,609 meters) above sea level.
The climate of Colorado is quite complex compared to most of the United States. Unlike in other states, southern Colorado is not necessarily warmer than northern Colorado. Most of Colorado is made up of mountains, foothills, high plains, and desert lands. Mountains and surrounding valleys greatly affect local climate. As a general rule, with an increase in elevation comes a decrease in temperature and an increase in precipitation. In the mountains, be prepared for cold winds and possible rain showers.
Summer days in Denver can be bright and sunny with normal temperatures ranging from 45-75F (7-24C), but the possibility of afternoon rainstorms always exists. Colorado also experiences high diurnal variations. Although daytime temperatures may be as high as 95 °F (35 °C) and sometimes 100 °F (38 °C), evenings can be chilly. Colorado usually has very low humidity (as low as 10%). Dehydration can exaggerate altitudinal effects. UV radiation can also be more intense than at sea level, so be sure to take sunglasses, sunblock, and a hat.