Overview: ColoradoColorado (United States of America) in general has a mild continental climate. The day temperatures range from 1 °C (34 °F) in December to 24 °C (75 °F) in July. The least rainy month in Colorado is October with its 8 days of rain, the rainiest month is August, when it rains 12 days. Temperatures during the night go from -15 °C (5 °F) in January to 6 °C (42 °F) in July.