This report describes the typical weather at the Jackson Hole Airport (Jackson Hole, Wyoming, United States) weather station over the course of an average July. It is based on the historical records from 1980 to 2012. Earlier records are either unavailable or unreliable.
Jackson Hole, Wyoming has a humid subarctic continental climate with cool summers and no dry season. The area within 25 mi of this station is covered by forests (85%), croplands (9%), grasslands (4%), and lakes and rivers (2%).
The month of July is characterized by gradually rising daily high temperatures, with daily highs ranging from 75°F to 79°F over the course of the month, exceeding 87°F or dropping below 65°F only one day in ten.
Over the course of July, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 48 minutes, implying an average day-over-day decrease of 1.5 minutes.
The shortest day of the month is July 31 with 14:35 hours of daylight; the longest day is July 1 with 15:23 hours of daylight.
The earliest sunrise is at 5:46am on July 1; the latest sunset is at 9:08pm on July 1; the latest sunrise is at 6:12am on July 31; the earliest sunset is at 8:47pm 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 ranges from 10% (mostly clear) to 23% (mostly clear). The trend is for the sky to be clearing with the median cloud cover decreasing by 13% from the start to the end of the month.
On July 30, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 57% of the time, and overcast or mostly cloudy 17% of the time.
On July 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 28% of the time, and clear or mostly clear 48% of the time.
The average probability that some form of precipitation will be observed in a given day is 19%, 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 74% of those days with precipitation. They are most likely around July 31, when it is observed during 16% of all days.
Light rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around July 1, when it is observed during 5% 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 23% (dry) to 80% (humid) over the course of a typical July, rarely dropping below 13% (very dry), or exceeding 94% (very humid).
The air is driest around July 12, at which time the relative humidity drops below 27% (dry) three days out of four; it is most humid around July 31, rising above 72% (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 31°F (dry) to 47°F (dry) and is rarely below 23°F (dry) or above 55°F (very comfortable).
Over the course of July typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around July 9, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around July 31, at which time the average daily maximum wind speed is 15 mph (moderate breeze).