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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).
Denver Temperatures: Averages by Month. The numbers here tell you how hot and cold the weather usually is in Denver, Colorado during each month of the year. The average high and low temperatures are listed below monthly and annually for Denver, in both degrees Fahrenheit and Celsius.Maximums and minimums are only part of the temperature picture.To fill in the rest, there's information on how many days a month get above or below a given temperature.o find out how often it rises over 70, 80 or 90 Â°F each month in Denver, scroll down farther. There are also monthly and yearly counts of days with cold weather. All the numbers are averages, based on climate data gathered from 1981 to 2010.