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1 Â°C. In most years, Denver averages a daily maximum temperature for April that's between 56 and 66 degrees Fahrenheit (13 to 19 degrees Celsius). The minimum temperature usually falls between 31 and 37 Â°F (0 to 3 Â°C).The days at Denver continue warming during April.early every day in April warms to over 40 Â°F (4 Â°C) in Denver. The city averages 8 days this month when the thermometer reaches into the 70s Â°F (over 21 Â°C).
weather and science facts. Average temperatures for April at cities, towns and parks throughout Colorado are listed below in degrees Fahrenheit and Celsius. The tables give the normals for maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center.