This report describes the typical weather at the Winnipeg James Armstrong Richardson International Airport (Winnipeg, Manitoba, Canada) weather station over the course of an average year. It is based on the historical records from 1982 to 2012. Earlier records are either unavailable or unreliable.
Winnipeg, Manitoba has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (88%), grasslands (9%), and built-up areas (3%).
Over the course of a year, the temperature typically varies from -6°F to 79°F and is rarely below -25°F or above 87°F.
The warm season lasts from May 19 to September 17 with an average daily high temperature above 65°F. The hottest day of the year is July 29, with an average high of 79°F and low of 58°F.
The cold season lasts from November 26 to March 6 with an average daily high temperature below 24°F. The coldest day of the year is January 21, with an average low of -6°F and high of 11°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 8:04 hours of daylight; the longest day is June 20 with 16:22 hours of daylight.
The earliest sunrise is at 5:19am on June 17 and the latest sunset is at 9:42pm on June 23. The latest sunrise is at 8:28am on January 1 and the earliest sunset is at 4:27pm on December 10.
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 56% (partly cloudy) to 89% (mostly cloudy). The sky is cloudiest on December 1 and clearest on August 8. The clearer part of the year begins around April 17. The cloudier part of the year begins around September 28.
On August 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 55% of the time, and overcast or mostly cloudy 43% of the time.
On December 1, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 68% of the time, and clear or mostly clear 30% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 25, occurring in 66% of days. Precipitation is least likely around April 7, occurring in 44% of days.
Over the entire year, the most common forms of precipitation are light snow, light rain, thunderstorms, and moderate rain.
Light snow is the most severe precipitation observed during 39% of those days with precipitation. It is most likely around December 25, when it is observed during 53% of all days.
Light rain is the most severe precipitation observed during 25% of those days with precipitation. It is most likely around May 29, when it is observed during 25% of all days.
Thunderstorms are the most severe precipitation observed during 13% of those days with precipitation. They are most likely around July 17, when it is observed during 21% of all days.
Moderate rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around September 16, when it is observed during 10% of all days.
During the warm season, which lasts from May 19 to September 17, there is a 49% 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 (43% of days with precipitation have at worst light rain), thunderstorms (34%), and moderate rain (18%).
During the cold season, which lasts from November 26 to March 6, there is a 62% 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 snow (77% of days with precipitation have at worst light snow) and moderate snow (15%).
The likelihood of snow falling is highest around January 2, occurring in 63% of days. The season in which it is relatively likely for snow to fall spans from October 18 to April 13.
During peak snow season, accumulation at this location on a given day is about as likely as not. The chances of there being snow on the ground are highest around January 11, occurring 51% of the time. The season in which snow is relatively likely to be on the ground spans from November 5 to April 3.
The snow is typically at its deepest on February 2, with a median depth of 6.7"; the depth exceeds 13.9" only one year out of ten.
The relative humidity typically ranges from 38% (comfortable) to 94% (very humid) over the course of the year, rarely dropping below 21% (dry) and reaching as high as 100% (very humid).
The air is driest around April 26, at which time the relative humidity drops below 48% (comfortable) three days out of four; it is most humid around July 11, exceeding 91% (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 -12°F (dry) to 63°F (mildy humid) and is rarely below -33°F (dry) or above 70°F (muggy).
The time of the year between May 28 and September 19 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 2 mph to 20 mph (light air to fresh breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 12 mph (gentle breeze) occurs around May 4, at which time the average daily maximum wind speed is 20 mph (fresh breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around July 26, at which time the average daily maximum wind speed is 16 mph (moderate breeze).