This report describes the typical weather at the Yellowknife Airport (Yellowknife, Northwest Territories, Canada) weather station over the course of an average March. It is based on the historical records from 1977 to 2012. Earlier records are either unavailable or unreliable.
Yellowknife, Northwest Territories has a continental climate with short dry cool summers. The area within 25 mi of this station is covered by lakes and rivers (40%), shrublands (34%), and forests (25%).
The month of March is characterized by very rapidly rising daily high temperatures, with daily highs increasing from 4°F to 22°F over the course of the month, exceeding 37°F or dropping below -12°F only one day in ten.
Over the course of March, the length of the day is very rapidly increasing. From the start to the end of the month, the length of the day increases by 3:03 hours, implying an average day-over-day increase of 5.9 minutes.
The shortest day of the month is March 1 with 10:23 hours of daylight; the longest day is March 31 with 13:26 hours of daylight.
The earliest sunrise is at 7:00am on March 31; the latest sunset is at 8:25pm on March 31; the latest sunrise is at 8:07am on March 11; the earliest sunset is at 6:02pm on March 1.
Daylight savings time (DST) starts at 3:00am on March 11, 2012, shifting sunrise and sunset to an hour later.
The median cloud cover is 70% (partly cloudy) and does not vary substantially over the course of the month.
On March 16, a representative day, the sky is clear or mostly clear 33% of the time, partly cloudy 15% of the time, and mostly cloudy or overcast 49% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around March 1, occurring in 59% of days. Precipitation is least likely around March 31, occurring in 45% of days.
Throughout March, the most common forms of precipitation are light snow and moderate snow.
Light snow is the most severe precipitation observed during 84% of those days with precipitation. It is most likely around March 1, when it is observed during 51% of all days.
Moderate snow is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around March 2, when it is observed during 7% of all days.
The likelihood of snow falling is highest around March 1, occurring in 59% of days.
Accumulation at this location in March is just more likely than not. The chances of there being snow on the ground are highest around March 21, occurring 65% of the time.
The snow is typically at its deepest on March 13, with a median depth of 14.3"; the depth exceeds 19.4" only one year out of ten.
The relative humidity typically ranges from 49% (comfortable) to 80% (humid) over the course of a typical March, rarely dropping below 37% (comfortable) and reaching as high as 99% (very humid).
The air is driest around March 28, at which time the relative humidity drops below 55% (mildly humid) three days out of four; it is most humid around March 31, rising above 70% (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 March, the dew point typically varies from -23°F (dry) to 9°F (dry) and is rarely below -43°F (dry) or above 25°F (dry).
Over the course of March typical wind speeds vary from 1 mph to 14 mph (light air to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around March 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 March 1, at which time the average daily maximum wind speed is 12 mph (moderate breeze).