This report describes the typical weather at the Tromsø Airport (Tromsø, Norway) weather station over the course of an average August. 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 August is characterized by falling daily high temperatures, with daily highs decreasing from 59°F to 54°F over the course of the month, exceeding 69°F or dropping below 47°F only one day in ten.
Over the course of August, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 5:18 hours, implying an average day-over-day decrease of 10.3 minutes.
The shortest day of the month is August 31 with 15:31 hours of daylight; the longest day is August 1 with 20:49 hours of daylight.
The earliest sunrise is at 2:21am on August 1; the latest sunset is at 11:10pm on August 1; the latest sunrise is at 4:58am on August 31; the earliest sunset is at 8:29pm on August 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in August, so the entire month is in daylight time.
The median cloud cover is 87% (mostly cloudy) and does not vary substantially over the course of the month.
On August 16, a representative day, the sky is clear or mostly clear 18% of the time, partly cloudy 20% of the time, and mostly cloudy or overcast 54% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around August 31, occurring in 70% of days. Precipitation is least likely around August 1, occurring in 64% of days.
Throughout August, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 69% of those days with precipitation. It is most likely around August 30, when it is observed during 49% of all days.
Light rain is the most severe precipitation observed during 22% of those days with precipitation. It is most likely around August 9, when it is observed during 15% of all days.
The likelihood of snow falling is highest around August 31, occurring in 3% of days.
Either snow rarely accumulates at this location in August or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 63% (mildly humid) to 94% (very humid) over the course of a typical August, rarely dropping below 46% (comfortable) and reaching as high as 100% (very humid).
The air is driest around August 8, at which time the relative humidity drops below 73% (humid) three days out of four; it is most humid around August 11, rising above 91% (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 August, the dew point typically varies from 39°F (dry) to 50°F (very comfortable) and is rarely below 32°F (dry) or above 56°F (comfortable).
Over the course of August typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around August 1, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around August 7, at which time the average daily maximum wind speed is 13 mph (moderate breeze).