This report describes the typical weather at the Denver International Airport (Denver, Colorado, United States) weather station over the course of an average July. It is based on the historical records from 1995 to 2012. Earlier records are either unavailable or unreliable.
Denver, Colorado has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by grasslands (86%), built-up areas (10%), and croplands (3%).
The month of July is characterized by essentially constant daily high temperatures, with daily highs around 88°F throughout the month, exceeding 97°F or dropping below 78°F only one day in ten.
Over the course of July, the length of the day is gradually decreasing. The shortest day of the month is July 31 with 14:15 hours of daylight; the longest day is July 1 with 14:57 hours of daylight.
The earliest sunrise is at 5:34am on July 1; the latest sunset is at 8:31pm on July 1; the latest sunrise is at 5:58am on July 31; the earliest sunset is at 8:13pm on July 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in July, so the entire month is in daylight time.
The median cloud cover is 61% (partly cloudy) and does not vary substantially over the course of the month.
On July 16, a representative day, the sky is clear or mostly clear 25% of the time, partly cloudy 34% of the time, and mostly cloudy or overcast 40% of the time.
The average probability that some form of precipitation will be observed in a given day is 47%, with little variation over the course of the month.
Throughout July, the most common forms of precipitation are thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 81% of those days with precipitation. They are most likely around July 7, when it is observed during 40% of all days.
Light rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around July 30, when it is observed during 7% of all days.
Either snow is exceptionally unlikely to fall at this location in July or this station does not reliably report precipitation types.
The relative humidity typically ranges from 22% (dry) to 77% (humid) over the course of a typical July, rarely dropping below 11% (very dry) and reaching as high as 96% (very humid).
The air is driest around July 9, at which time the relative humidity drops below 27% (dry) three days out of four; it is most humid around July 31, rising above 66% (mildly humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical July, the dew point typically varies from 39°F (dry) to 56°F (comfortable) and is rarely below 28°F (dry) or above 62°F (mildy humid).
The time of the month between July 1 and July 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of July typical wind speeds vary from 0 mph to 20 mph (calm to fresh breeze), rarely exceeding 26 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around July 1, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around July 28, at which time the average daily maximum wind speed is 19 mph (fresh breeze).