This report describes the typical weather at the Tromsø Airport (Tromsø, Norway) weather station over the course of an average March. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Tromsø 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 (47%), oceans and seas (36%), and forests (14%).
The month of March is characterized by gradually rising daily high temperatures, with daily highs around 33°F throughout the month, exceeding 41°F or dropping below 23°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 4:17 hours, implying an average day-over-day increase of 8.3 minutes.
The shortest day of the month is March 1 with 9:38 hours of daylight; the longest day is March 31 with 13:55 hours of daylight.
The earliest sunrise is at 5:24am on March 24; the latest sunset is at 7:47pm on March 31; the latest sunrise is at 7:09am on March 1; the earliest sunset is at 4:46pm on March 1.
Daylight savings time (DST) starts at 3:00am on March 25, 2012, shifting sunrise and sunset to an hour later.
The median cloud cover is 82% (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 20% of the time, partly cloudy 20% of the time, and mostly cloudy or overcast 45% of the time.
The average probability that some form of precipitation will be observed in a given day is 70%, with little variation over the course of the month.
Throughout March, the most common forms of precipitation are moderate snow, light snow, and moderate rain.
Moderate snow is the most severe precipitation observed during 63% of those days with precipitation. It is most likely around March 7, when it is observed during 46% of all days.
Light snow is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around March 2, when it is observed during 15% of all days.
Moderate rain is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around March 31, when it is observed during 10% of all days.
The likelihood of snow falling is highest around March 1, occurring in 62% of days.
Accumulation at this location in March is very unlikely. The chances of there being snow on the ground are highest around March 13, occurring 7% of the time.
The snow is typically at its deepest on March 2, with a median depth of 15.7"; the depth exceeds 24.2" only one year out of ten.
The relative humidity typically ranges from 58% (mildly humid) to 90% (very humid) over the course of a typical March, rarely dropping below 44% (comfortable) and reaching as high as 100% (very humid).
The air is driest around March 31, at which time the relative humidity drops below 66% (mildly humid) three days out of four; it is most humid around March 1, 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 15°F (dry) to 27°F (dry) and is rarely below 6°F (dry) or above 34°F (dry).
Over the course of March typical wind speeds vary from 0 mph to 20 mph (calm to fresh breeze), rarely exceeding 30 mph (strong breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around March 1, 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 March 31, at which time the average daily maximum wind speed is 16 mph (moderate breeze).