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 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 October is characterized by very rapidly falling daily high temperatures, with daily highs decreasing from 61°F to 45°F over the course of the month, exceeding 73°F or dropping below 33°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 1:26 hours, implying an average day-over-day decrease of 2.8 minutes.
The shortest day of the month is October 31 with 10:16 hours of daylight; the longest day is October 1 with 11:42 hours of daylight.
The earliest sunrise is at 7:21am on October 1; the latest sunset is at 7:02pm on October 1; the latest sunrise is at 7:59am on October 31; the earliest sunset is at 6:14pm on October 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in October, so the entire month is in daylight time.
The median cloud cover ranges from 27% (mostly clear) to 59% (partly cloudy). The trend is for the sky to be becoming rapidly cloudier with the median cloud cover increasing by 32% 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 48% of the time, and overcast or mostly cloudy 29% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 43% of the time, and clear or mostly clear 35% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 31, occurring in 22% of days. Precipitation is least likely around October 1, occurring in 15% of days.
Throughout October, the most common forms of precipitation are light snow, light rain, and moderate snow.
Light snow is the most severe precipitation observed during 43% of those days with precipitation. It is most likely around October 31, when it is observed during 13% of all days.
Light rain is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around October 3, when it is observed during 6% of all days.
Moderate snow is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around October 30, when it is observed during 4% of all days.
The likelihood of snow falling is highest around October 31, occurring in 17% 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 31% (comfortable) to 88% (very humid) over the course of a typical October, rarely dropping below 15% (very dry) and reaching as high as 99% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 38% (comfortable) three days out of four; it is most humid around October 31, rising above 83% (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 16°F (dry) to 34°F (dry) and is rarely below 5°F (dry) or above 42°F (dry).
Over the course of October typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around October 29, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around October 2, at which time the average daily maximum wind speed is 14 mph (moderate breeze).