This report describes the typical weather at the Bryce Canyon Airport (Bryce Canyon, Utah, United States) weather station over the course of an average September. It is based on the historical records from 2001 to 2012. Earlier records are either unavailable or unreliable.
Bryce Canyon, Utah has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by shrublands (81%) and forests (18%).
The month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 75°F to 65°F over the course of the month, exceeding 79°F or dropping below 55°F only one day in ten.
Over the course of September, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:09 hours, implying an average day-over-day decrease of 2.3 minutes.
The shortest day of the month is September 30 with 11:49 hours of daylight; the longest day is September 1 with 12:57 hours of daylight.
The earliest sunrise is at 6:59am on September 1; the latest sunset is at 7:56pm on September 1; the latest sunrise is at 7:24am on September 30; the earliest sunset is at 7:13pm on September 30.
Daylight saving time is observed in 2012 but it neither starts nor ends in September, so the entire month is in daylight time.
The median cloud cover is 3% (clear) and does not vary substantially over the course of the month.
On September 15, a representative day, the sky is clear or mostly clear 80% of the time, partly cloudy 5% of the time, and mostly cloudy or overcast 14% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around September 1, occurring in 40% of days. Precipitation is least likely around September 29, occurring in 30% of days.
Throughout September, the most common forms of precipitation are thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 71% of those days with precipitation. They are most likely around September 1, when it is observed during 31% of all days.
Light rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around September 18, when it is observed during 6% of all days.
The likelihood of snow falling is highest around September 30, occurring in 4% of days.
Either snow rarely accumulates at this location in September or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 21% (dry) to 77% (humid) over the course of a typical September, rarely dropping below 11% (very dry), or exceeding 94% (very humid).
The air is driest around September 21, at which time the relative humidity drops below 25% (dry) three days out of four; it is most humid around September 30, rising above 68% (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 September, the dew point typically varies from 21°F (dry) to 41°F (dry) and is rarely below 11°F (dry) or above 51°F (very comfortable).
Over the course of September 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 8 mph (gentle breeze) occurs around September 25, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around September 1, at which time the average daily maximum wind speed is 16 mph (moderate breeze).