This report describes the typical weather at the Vancouver International Airport (Vancouver, British Columbia, Canada) weather station over the course of an average October. It is based on the historical records from 1977 to 2012. Earlier records are either unavailable or unreliable.
Vancouver, British Columbia has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (57%), forests (34%), and built-up areas (8%).
The month of October is characterized by falling daily high temperatures, with daily highs decreasing from 61°F to 52°F over the course of the month, exceeding 66°F or dropping below 48°F only one day in ten.
Over the course of October, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1:45 hours, implying an average day-over-day decrease of 3.4 minutes.
The shortest day of the month is October 31 with 9:52 hours of daylight; the longest day is October 1 with 11:37 hours of daylight.
The earliest sunrise is at 7:13am on October 1; the latest sunset is at 6:50pm on October 1; the latest sunrise is at 8:00am on October 31; the earliest sunset is at 5:52pm 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 77% (partly cloudy) to 93% (mostly cloudy). The trend is for the sky to be becoming rapidly cloudier with the median cloud cover increasing by 15% 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 42% of the time, and overcast or mostly cloudy 57% of the time.
On October 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 78% of the time, and clear or mostly clear 21% 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 64% of days. Precipitation is least likely around October 1, occurring in 47% of days.
Throughout October, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 53% of those days with precipitation. It is most likely around October 31, when it is observed during 33% of all days.
Moderate rain is the most severe precipitation observed during 39% of those days with precipitation. It is most likely around October 31, when it is observed during 26% of all days.
The likelihood of snow falling is highest around October 31, occurring in 2% 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 67% (mildly humid) to 96% (very humid) over the course of a typical October, rarely dropping below 54% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 74% (humid) three days out of four; it is most humid around October 19, rising above 93% (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 38°F (dry) to 52°F (very comfortable) and is rarely below 31°F (dry) or above 57°F (comfortable).
Over the course of October typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 24 mph (fresh breeze).
The highest average wind speed of 8 mph (light breeze) occurs around October 31, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around October 1, at which time the average daily maximum wind speed is 12 mph (moderate breeze).