This report describes the typical weather at the Kiruna Airport (Kiruna, Sweden) weather station over the course of an average year. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
Kiruna has a humid subarctic continental climate with cool summers and no dry season. The area within 25 mi of this station is covered by forests (56%), shrublands (30%), tundra (10%), and lakes and rivers (4%).
Over the course of a year, the temperature typically varies from 2°F to 63°F and is rarely below -17°F or above 72°F.
The warm season lasts from June 6 to September 2 with an average daily high temperature above 54°F. The hottest day of the year is July 24, with an average high of 63°F and low of 49°F.
The cold season lasts from November 10 to March 14 with an average daily high temperature below 25°F. The coldest day of the year is January 30, with an average low of 2°F and high of 16°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 0:00 hours of daylight; the longest day is June 20 with 24:00 hours of daylight.
Due to its extreme latitude, Kiruna experiences polar day (also known as the midnight Sun) during summer and polar night during winter. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.
In summer, the Sun is continuously above the horizon for 47 days, from May 28 to July 14.
In winter, the Sun is continuously below the horizon for 21 days, from December 11 to January 1.
Daylight saving time (DST) is observed in this location during 2012, starting in the spring on March 25 and ending in the fall on October 28.
The median cloud cover ranges from 75% (partly cloudy) to 88% (mostly cloudy). The sky is cloudiest on November 22 and clearest on February 27. The clearer part of the year begins around January 18. The cloudier part of the year begins around April 27.
On February 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 23% of the time, and overcast or mostly cloudy 26% of the time.
On November 22, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 46% of the time, and clear or mostly clear 8% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around November 23, occurring in 73% of days. Precipitation is least likely around August 28, occurring in 59% of days.
Over the entire year, the most common forms of precipitation are moderate snow, light snow, light rain, and moderate rain.
Moderate snow is the most severe precipitation observed during 33% of those days with precipitation. It is most likely around December 22, when it is observed during 36% of all days.
Light snow is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around January 27, when it is observed during 35% of all days.
Light rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around July 1, when it is observed during 24% of all days.
Moderate rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around August 7, when it is observed during 25% of all days.
During the warm season, which lasts from June 6 to September 2, there is a 61% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (37% of days with precipitation have at worst light rain), moderate rain (36%), thunderstorms (8%), and drizzle (6%).
During the cold season, which lasts from November 10 to March 14, there is a 70% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate snow (48% of days with precipitation have at worst moderate snow) and light snow (47%).
The likelihood of snow falling is highest around December 10, occurring in 71% of days. The season in which it is relatively likely for snow to fall spans from September 23 to May 31.
During peak snow season, accumulation at this location on a given day is unlikely. The chances of there being snow on the ground are highest around October 18, occurring 17% of the time. The season in which snow is relatively likely to be on the ground spans from October 1 to May 11.
The snow is typically at its deepest on April 11, with a median depth of 28.4"; the depth exceeds 29.6" only one year out of ten.
The relative humidity typically ranges from 46% (comfortable) to 93% (very humid) over the course of the year, rarely dropping below 29% (dry) and reaching as high as 100% (very humid).
The air is driest around June 8, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around August 30, exceeding 90% (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 year, the dew point typically varies from -4°F (dry) to 50°F (very comfortable) and is rarely below -23°F (dry) or above 57°F (comfortable).
Over the course of the year typical wind speeds vary from 2 mph to 14 mph (light air to moderate breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around March 17, 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 5, at which time the average daily maximum wind speed is 12 mph (gentle breeze).