This report describes the typical weather at the Jackson Hole Airport (Jackson Hole, Wyoming, United States) weather station over the course of an average May. It is based on the historical records from 2012 to 2015. 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 May is characterized by rapidly rising daily high temperatures, with daily highs increasing from 52°F to 64°F over the course of the month, exceeding 71°F or dropping below 44°F only one day in ten.
Over the course of May, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:02 hours, implying an average day-over-day increase of 2.0 minutes.
The shortest day of the month is May 1 with 14:09 hours of daylight; the longest day is May 31 with 15:11 hours of daylight.
The earliest sunrise is at 5:45am on May 31; the latest sunset is at 8:56pm on May 31; the latest sunrise is at 6:15am on May 1; the earliest sunset is at 8:25pm on May 1.
Daylight saving time is observed in 2015 but it neither starts nor ends in May, so the entire month is in daylight time.
The median cloud cover ranges from 30% (mostly clear) to 45% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 15% from the start to the end of the month.
On May 31, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.
On May 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 52% of the time, and clear or mostly clear 48% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 1, occurring in 30% of days. Precipitation is least likely around May 31, occurring in 15% of days.
Throughout May, the most common forms of precipitation are light rain, thunderstorms, light snow, and moderate snow.
Light rain is the most severe precipitation observed during 33% of those days with precipitation. It is most likely around May 1, when it is observed during 9% of all days.
Thunderstorms are the most severe precipitation observed during 26% of those days with precipitation. They are most likely around May 28, when it is observed during 7% of all days.
Light snow is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around May 1, when it is observed during 10% of all days.
Moderate snow is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around May 1, when it is observed during 5% of all days.
The likelihood of snow falling is highest around May 1, occurring in 16% of days.
Either snow rarely accumulates at this location in May or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 31% (comfortable) to 92% (very humid) over the course of a typical May, rarely dropping below 20% (dry) and reaching as high as 97% (very humid).
The air is driest around May 31, at which time the relative humidity drops below 37% (comfortable) three days out of four; it is most humid around May 1, rising above 89% (very 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 May, the dew point typically varies from 20°F (dry) to 40°F (dry) and is rarely below 15°F (dry) or above 43°F (dry).
Over the course of May typical wind speeds vary from 0 mph to 18 mph (calm to fresh breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around May 2, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around May 23, at which time the average daily maximum wind speed is 17 mph (moderate breeze).