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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).
Regardless of how warm the days get, Denver cools down at night to below 70 Â°F. Summer nights can stay in the 60s, but outside of July lows are more often down to the 50s. From October to April, nighttime temperatures in Denver normally fall below 50 degrees.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.