This report describes the typical weather at the Reno-Tahoe International Airport (Reno, Nevada, United States) weather station over the course of an average October. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Reno, Nevada has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (66%), forests (23%), grasslands (8%), and lakes and rivers (3%).
The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 76°F to 62°F over the course of the month, exceeding 86°F or dropping below 50°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 1:14 hours, implying an average day-over-day decrease of 2.4 minutes.
The shortest day of the month is October 31 with 10:31 hours of daylight; the longest day is October 1 with 11:45 hours of daylight.
The earliest sunrise is at 6:56am on October 1; the latest sunset is at 6:41pm on October 1; the latest sunrise is at 7:27am on October 31; the earliest sunset is at 5:58pm 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 15% (mostly clear) to 36% (mostly clear). The trend is for the sky to be becoming rapidly cloudier with the median cloud cover increasing by 21% 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 78% of the time, and overcast or mostly cloudy 20% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 47% of the time, and clear or mostly clear 51% 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 16% of days.
Throughout October, the most common forms of precipitation are light rain, thunderstorms, moderate rain, and light snow.
Light rain is the most severe precipitation observed during 41% of those days with precipitation. It is most likely around October 31, when it is observed during 9% 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 5% of all days.
Moderate rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around October 31, when it is observed during 4% of all days.
Light snow is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around October 31, when it is observed during 5% of all days.
The likelihood of snow falling is highest around October 31, occurring in 6% of days.
Accumulation at this location in October is extremely unlikely. The chances of there being snow on the ground are highest around October 14, occurring 3% of the time.
The snow is typically at its deepest on October 30, with a median depth of 3.5"; the depth exceeds 5.7" only one year out of ten.
The relative humidity typically ranges from 20% (dry) to 80% (humid) over the course of a typical October, rarely dropping below 10% (very dry) and reaching as high as 98% (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 71% (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 22°F (dry) to 38°F (dry) and is rarely below 13°F (dry) or above 46°F (dry).
Over the course of October typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 5 mph (light breeze) occurs around October 1, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around October 14, at which time the average daily maximum wind speed is 12 mph (gentle breeze).