This report describes the typical weather at the Jackson Hole Airport (Jackson Hole, Wyoming, United States) weather station over the course of an average October. 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 October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 57°F to 47°F over the course of the month, exceeding 65°F or dropping below 38°F only one day in ten.
Over the course of October, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:25 hours, implying an average day-over-day decrease of 2.7 minutes.
The shortest day of the month is October 31 with 10:19 hours of daylight; the longest day is October 1 with 11:44 hours of daylight.
The earliest sunrise is at 7:20am on October 1; the latest sunset is at 7:04pm on October 1; the latest sunrise is at 7:57am on October 31; the earliest sunset is at 6:16pm on October 31.
Daylight saving time is observed in 2015 but it neither starts nor ends in October, so the entire month is in daylight time.
The median cloud cover ranges from 33% (mostly clear) to 50% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 14% from the start to the end of the month.
On October 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 32% of the time.
On October 26, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 52% of the time, and clear or mostly clear 47% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 24, occurring in 33% of days. Precipitation is least likely around October 9, occurring in 26% of days.
Throughout October, the most common forms of precipitation are moderate snow, thunderstorms, light snow, and light rain.
Moderate snow is the most severe precipitation observed during 45% of those days with precipitation. It is most likely around October 31, when it is observed during 18% of all days.
Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around October 1, when it is observed during 9% of all days.
Light snow is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around October 25, when it is observed during 7% of all days.
Light rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around October 1, when it is observed during 5% of all days.
The likelihood of snow falling is highest around October 26, occurring in 25% of days.
Either snow rarely accumulates at this location in October or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 34% (comfortable) to 97% (very humid) over the course of a typical October, rarely dropping below 25% (dry) and reaching as high as 100% (very humid).
The air is driest around October 11, at which time the relative humidity drops below 40% (comfortable) three days out of four; it is most humid around October 31, rising above 95% (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 October, the dew point typically varies from 20°F (dry) to 36°F (dry) and is rarely below 15°F (dry) or above 42°F (dry).
Over the course of October 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 7 mph (light breeze) occurs around October 30, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around October 15, at which time the average daily maximum wind speed is 13 mph (moderate breeze).