This report describes the typical weather at the Scottsdale Municipal Airport (Scottsdale, Arizona, United States) weather station over the course of an average October. It is based on the historical records from 1988 to 2012. Earlier records are either unavailable or unreliable.
Scottsdale, Arizona has a hot desert climate. The area within 25 mi of this station is covered by shrublands (82%), grasslands (10%), built-up areas (3%), and forests (2%).
The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 93°F to 79°F over the course of the month, exceeding 100°F or dropping below 69°F only one day in ten.
Over the course of October, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 59 minutes, implying an average day-over-day decrease of 1.9 minutes.
The shortest day of the month is October 31 with 10:50 hours of daylight; the longest day is October 1 with 11:49 hours of daylight.
The earliest sunrise is at 6:23am on October 1; the latest sunset is at 6:11pm on October 1; the latest sunrise is at 6:46am on October 31; the earliest sunset is at 5:36pm on October 31.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 0% (clear) and does not vary substantially over the course of the month.
On October 16, a representative day, the sky is clear or mostly clear 64% of the time, partly cloudy 7% of the time, and mostly cloudy or overcast 11% of the time.
The average probability that some form of precipitation will be observed in a given day is 8%, with little variation over the course of the month.
Throughout October, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 52% of those days with precipitation. They are most likely around October 1, when it is observed during 7% of all days.
Light rain is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around October 31, when it is observed during 3% of all days.
Moderate rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around October 30, when it is observed during 2% of all days.
Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.
The relative humidity typically ranges from 20% (dry) to 79% (humid) over the course of a typical October, rarely dropping below 9% (very dry) and reaching as high as 100% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 23% (dry) three days out of four; it is most humid around October 31, rising above 54% (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 October, the dew point typically varies from 32°F (dry) to 50°F (dry) and is rarely below 17°F (dry) or above 61°F (comfortable).
Over the course of October typical wind speeds vary from 0 mph to 10 mph (calm to gentle breeze), rarely exceeding 16 mph (moderate breeze).
The highest average wind speed of 4 mph (light breeze) occurs around October 1, at which time the average daily maximum wind speed is 10 mph (gentle breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around October 31, at which time the average daily maximum wind speed is 9 mph (gentle breeze).