This report describes the typical weather at the Vancouver International Airport (Vancouver, British Columbia, Canada) weather station over the course of an average year. 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%).
Over the course of a year, the temperature typically varies from 33°F to 73°F and is rarely below 22°F or above 79°F.
The warm season lasts from June 17 to September 10 with an average daily high temperature above 66°F. The hottest day of the year is July 30, with an average high of 73°F and low of 58°F.
The cold season lasts from November 15 to March 2 with an average daily high temperature below 48°F. The coldest day of the year is December 27, with an average low of 33°F and high of 42°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 8:12 hours of daylight; the longest day is June 20 with 16:13 hours of daylight.
The earliest sunrise is at 5:06am on June 14 and the latest sunset is at 9:22pm on June 26. The latest sunrise is at 8:08am on December 30 and the earliest sunset is at 4:14pm on December 11.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 53% (partly cloudy) to 97% (overcast). The sky is cloudiest on December 22 and clearest on August 15. The clearer part of the year begins around June 28. The cloudier part of the year begins around September 24.
On August 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 57% of the time, and overcast or mostly cloudy 42% of the time.
On December 22, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 80% of the time, and clear or mostly clear 17% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 5, occurring in 72% of days. Precipitation is least likely around August 4, occurring in 28% of days.
Over the entire year, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 55% of those days with precipitation. It is most likely around March 29, when it is observed during 38% of all days.
Moderate rain is the most severe precipitation observed during 33% of those days with precipitation. It is most likely around November 15, when it is observed during 27% of all days.
During the warm season, which lasts from June 17 to September 10, there is a 33% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (59% of days with precipitation have at worst light rain), moderate rain (32%), and thunderstorms (7%).
During the cold season, which lasts from November 15 to March 2, there is a 68% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (48% of days with precipitation have at worst light rain), moderate rain (34%), and light snow (9%).
The likelihood of snow falling is highest around January 1, occurring in 13% of days. The season in which it is relatively likely for snow to fall spans from November 10 to March 17.
During peak snow season, accumulation at this location on a given day is unlikely. The chances of there being snow on the ground are highest around January 1, occurring 11% of the time. The season in which snow is relatively likely to be on the ground spans from November 26 to January 23.
The snow is typically at its deepest on January 8, with a median depth of 4.3"; the depth exceeds 6.6" only one year out of ten.
The relative humidity typically ranges from 55% (mildly humid) to 96% (very humid) over the course of the year, rarely dropping below 43% (comfortable) and reaching as high as 100% (very humid).
The air is driest around June 28, at which time the relative humidity drops below 61% (mildly humid) three days out of four; it is most humid around January 2, exceeding 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 year, the dew point typically varies from 29°F (dry) to 59°F (comfortable) and is rarely below 16°F (dry) or above 63°F (mildy humid).
The time of the year between May 16 and October 13 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 26 mph (strong breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around March 19, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around September 27, at which time the average daily maximum wind speed is 12 mph (moderate breeze).