This report describes the typical weather at the Saskatoon John G. Diefenbaker International Airport (Saskatoon, Saskatchewan, Canada) weather station over the course of an average December. It is based on the historical records from 1977 to 2012. Earlier records are either unavailable or unreliable.
Saskatoon, Saskatchewan has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (51%), grasslands (46%), and lakes and rivers (2%).
The month of December is characterized by falling daily high temperatures, with daily highs decreasing from 20°F to 13°F over the course of the month, exceeding 37°F or dropping below -10°F only one day in ten.
Over the course of December, the length of the day is essentially constant. The shortest day of the month is December 21 with 7:41 hours of daylight; the longest day is December 1 with 8:04 hours of daylight.
The earliest sunrise is at 8:54am on December 1; the latest sunset is at 5:05pm on December 31; the latest sunrise is at 9:17am on December 31; the earliest sunset is at 4:54pm on December 11.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 85% (mostly cloudy) and does not vary substantially over the course of the month.
On December 16, a representative day, the sky is clear or mostly clear 31% of the time, partly cloudy 7% of the time, and mostly cloudy or overcast 59% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around December 27, occurring in 62% of days. Precipitation is least likely around December 1, occurring in 58% of days.
Throughout December, the most common forms of precipitation are light snow and moderate snow.
Light snow is the most severe precipitation observed during 80% of those days with precipitation. It is most likely around December 29, when it is observed during 50% of all days.
Moderate snow is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around December 30, when it is observed during 10% of all days.
The likelihood of snow falling is highest around December 29, occurring in 61% of days.
Accumulation at this location in December is just less likely than not. The chances of there being snow on the ground are highest around December 26, occurring 38% of the time.
The snow is typically at its deepest on December 20, with a median depth of 3.9"; the depth exceeds 7.5" only one year out of ten.
The relative humidity typically ranges from 67% (mildly humid) to 89% (very humid) over the course of a typical December, rarely dropping below 54% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around December 31, at which time the relative humidity drops below 74% (humid) three days out of four; it is most humid around December 1, rising above 83% (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 December, the dew point typically varies from -10°F (dry) to 14°F (dry) and is rarely below -36°F (dry) or above 30°F (dry).
Over the course of December typical wind speeds vary from 3 mph to 15 mph (light air to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around December 9, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around December 21, at which time the average daily maximum wind speed is 14 mph (moderate breeze).