This report describes the typical weather at the Lake Tahoe Airport (South Lake Tahoe, California, 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.
South Lake Tahoe, California has a continental climate with dry warm summers. The area within 25 mi of this station is covered by forests (62%), shrublands (15%), grasslands (11%), and lakes and rivers (10%).
The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 67°F to 55°F over the course of the month, exceeding 77°F or dropping below 42°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 1:12 hours, implying an average day-over-day decrease of 2.3 minutes.
The shortest day of the month is October 31 with 10:33 hours of daylight; the longest day is October 1 with 11:45 hours of daylight.
The earliest sunrise is at 6:57am on October 1; the latest sunset is at 6:42pm on October 1; the latest sunrise is at 7:27am on October 31; the earliest sunset is at 6:00pm 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 7% (clear) to 21% (mostly clear). 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 54% of the time, and overcast or mostly cloudy 16% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 31% of the time, and clear or mostly clear 40% 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 24% of days. Precipitation is least likely around October 1, occurring in 16% of days.
Throughout October, the most common forms of precipitation are light snow, light rain, and thunderstorms.
Light snow is the most severe precipitation observed during 30% of those days with precipitation. It is most likely around October 31, when it is observed during 9% of all days.
Light rain is the most severe precipitation observed during 30% of those days with precipitation. It is most likely around October 23, when it is observed during 6% of all days.
Thunderstorms are the most severe precipitation observed during 12% of those days with precipitation. They are most likely around October 1, when it is observed during 4% of all days.
The likelihood of snow falling is highest around October 31, occurring in 14% 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 31, with a median depth of 6.6"; the depth exceeds 11.1" only one year out of ten.
The relative humidity typically ranges from 27% (dry) to 91% (very humid) over the course of a typical October, rarely dropping below 15% (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 33% (comfortable) three days out of four; it is most humid around October 30, rising above 85% (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 21°F (dry) to 38°F (dry) and is rarely below 10°F (dry) or above 45°F (dry).
Over the course of October typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 5 mph (light breeze) occurs around October 31, at which time the average daily maximum wind speed is 12 mph (gentle breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around October 4, at which time the average daily maximum wind speed is 12 mph (gentle breeze).