This report describes the typical weather at the Churchill Airport (Churchill, Manitoba, 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.
Churchill, Manitoba has a humid subarctic continental climate with cool summers and no dry season. The area within 25 mi of this station is covered by tundra (45%), oceans and seas (44%), shrublands (7%), and lakes and rivers (3%).
Over the course of a year, the temperature typically varies from -22°F to 64°F and is rarely below -34°F or above 78°F.
The warm season lasts from June 9 to September 14 with an average daily high temperature above 50°F. The hottest day of the year is July 27, with an average high of 64°F and low of 48°F.
The cold season lasts from November 30 to March 18 with an average daily high temperature below 7°F. The coldest day of the year is January 22, with an average low of -22°F and high of -8°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 6:17 hours of daylight; the longest day is June 20 with 18:25 hours of daylight.
The earliest sunrise is at 4:05am on June 19 and the latest sunset is at 10:31pm on June 21. The latest sunrise is at 9:09am on December 27 and the earliest sunset is at 3:20pm on December 14.
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 62% (partly cloudy) to 98% (overcast). The sky is cloudiest on October 24 and clearest on February 14. The clearer part of the year begins around December 17. The cloudier part of the year begins around April 10.
On February 14, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 51% of the time, and overcast or mostly cloudy 45% of the time.
On October 24, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 88% of the time, and clear or mostly clear 11% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around October 26, occurring in 82% of days. Precipitation is least likely around July 5, occurring in 54% of days.
Over the entire year, the most common forms of precipitation are light snow, light rain, and moderate snow.
Light snow is the most severe precipitation observed during 56% of those days with precipitation. It is most likely around November 17, when it is observed during 63% of all days.
Light rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around August 19, when it is observed during 34% of all days.
Moderate snow is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around October 27, when it is observed during 14% of all days.
During the warm season, which lasts from June 9 to September 14, there is a 59% 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 (18%), thunderstorms (11%), and light snow (9%).
During the cold season, which lasts from November 30 to March 18, there is a 60% 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 (88% of days with precipitation have at worst light snow) and moderate snow (10%).
The likelihood of snow falling is highest around November 12, occurring in 77% of days. The season in which it is relatively likely for snow to fall spans from September 17 to June 8.
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 December 17, occurring 46% of the time. The season in which snow is relatively likely to be on the ground spans from October 8 to May 30.
The snow is typically at its deepest on April 8, with a median depth of 13.1"; the depth exceeds 22.8" only one year out of ten.
The relative humidity typically ranges from 57% (mildly humid) to 97% (very humid) over the course of the year, rarely dropping below 35% (comfortable) and reaching as high as 100% (very humid).
The air is driest around July 8, at which time the relative humidity drops below 70% (humid) three days out of four; it is most humid around August 19, exceeding 95% (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 -30°F (dry) to 53°F (very comfortable) and is rarely below -43°F (dry) or above 61°F (comfortable).
The time of the year between July 11 and August 24 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 4 mph to 21 mph (light breeze to fresh breeze), rarely exceeding 33 mph (high wind).
The highest average wind speed of 15 mph (moderate breeze) occurs around November 10, at which time the average daily maximum wind speed is 21 mph (fresh breeze).
The lowest average wind speed of 10 mph (gentle breeze) occurs around July 18, at which time the average daily maximum wind speed is 16 mph (moderate breeze).