This report describes the typical weather at the Reykjavík Airport (Reykjavík, Iceland) weather station over the course of an average March. It is based on the historical records from 1979 to 2012. Earlier records are either unavailable or unreliable.
Reykjavík has a humid subarctic continental climate with cool summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (39%), shrublands (34%), forests (19%), and tundra (4%).
The month of March is characterized by gradually rising daily high temperatures, with daily highs around 38°F throughout the month, exceeding 46°F or dropping below 28°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 3:15 hours, implying an average day-over-day increase of 6.3 minutes.
The shortest day of the month is March 1 with 10:13 hours of daylight; the longest day is March 31 with 13:28 hours of daylight.
The earliest sunrise is at 6:48am on March 31; the latest sunset is at 8:16pm on March 31; the latest sunrise is at 8:33am on March 1; the earliest sunset is at 6:46pm on March 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 89% (mostly 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 17% of the time, partly cloudy 16% of the time, and mostly cloudy or overcast 59% of the time.
The average probability that some form of precipitation will be observed in a given day is 78%, with little variation over the course of the month.
Throughout March, the most common forms of precipitation are moderate snow, moderate rain, and light snow.
Moderate snow is the most severe precipitation observed during 49% of those days with precipitation. It is most likely around March 2, when it is observed during 43% of all days.
Moderate rain is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around March 31, when it is observed during 22% of all days.
Light snow is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around March 23, when it is observed during 11% of all days.
The likelihood of snow falling is highest around March 1, occurring in 55% of days.
Accumulation at this location in March is extremely unlikely. The chances of there being snow on the ground are highest around March 10, occurring 4% of the time.
The snow is typically at its deepest on March 28, with a median depth of 5.9"; the depth exceeds 6.5" only one year out of ten.
The relative humidity typically ranges from 62% (mildly humid) to 90% (very humid) over the course of a typical March, rarely dropping below 47% (comfortable) and reaching as high as 100% (very humid).
The air is driest around March 27, at which time the relative humidity drops below 70% (humid) three days out of four; it is most humid around March 8, rising above 86% (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 typical March, the dew point typically varies from 20°F (dry) to 32°F (dry) and is rarely below 7°F (dry) or above 42°F (dry).
Over the course of March typical wind speeds vary from 4 mph to 25 mph (light breeze to strong breeze), rarely exceeding 39 mph (gale).
The highest average wind speed of 15 mph (moderate breeze) occurs around March 12, at which time the average daily maximum wind speed is 24 mph (strong breeze).
The lowest average wind speed of 14 mph (moderate breeze) occurs around March 31, at which time the average daily maximum wind speed is 22 mph (fresh breeze).