Average Weather In October For Tromsø, Norway
Location
This report describes the typical weather at the Tromsø Airport (Tromsø, Norway) weather station over the course of an average October. 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%).
Temperature
The month of October is characterized by falling daily high temperatures, with daily highs decreasing from 46°F to 38°F over the course of the month, exceeding 51°F or dropping below 30°F only one day in ten.
Daily High and Low Temperature in October
The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Fraction of Time Spent in Various Temperature Bands in October
The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).
Sun
Over the course of October, 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 4:26 hours, implying an average day-over-day decrease of 8.6 minutes.
The shortest day of the month is October 31 with 6:39 hours of daylight; the longest day is October 1 with 11:05 hours of daylight.
Daily Hours of Daylight and Twilight in October
The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.
The earliest sunrise is at 7:01am on October 1; the latest sunset is at 6:06pm on October 1; the latest sunrise is at 8:49am on October 27; the earliest sunset is at 2:47pm on October 31.
Daylight savings time (DST) ends at 2:00am on October 28, 2012, shifting sunrise and sunset to an hour earlier.
Daily Sunrise & Sunset with Twilight and Daylight Savings Time in October
The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight savings time are indicated by the "DST" labels.
Clouds
The median cloud cover is 88% (mostly cloudy) and does not vary substantially over the course of the month.
Median Cloud Cover in October
The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).
On October 16, a representative day, the sky is clear or mostly clear 18% of the time, partly cloudy 19% of the time, and mostly cloudy or overcast 56% of the time.
Cloud Cover Types in October
The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.
Precipitation
The average probability that some form of precipitation will be observed in a given day is 75%, with little variation over the course of the month.
Probability of Precipitation at Some Point in the Day in October
The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.
Throughout October, the most common forms of precipitation are moderate rain, moderate snow, light rain, and light snow.
Moderate rain is the most severe precipitation observed during 45% of those days with precipitation. It is most likely around October 1, when it is observed during 43% of all days.
Moderate snow is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around October 31, when it is observed during 29% of all days.
Light rain is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around October 1, when it is observed during 12% of all days.
Light snow is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around October 31, when it is observed during 10% of all days.
Types of Precipitation Throughout October
Relative frequency of various types of precipitation over the course of a typical October.
Snow
The likelihood of snow falling is highest around October 31, occurring in 40% of days.
Probability of Snow Fall Being Reported in a Given Day in October
Probability that snow will be reported at least once in a given day.
Accumulation at this location in October is extremely unlikely. The chances of there being snow on the ground are highest around October 13, occurring 3% of the time.
Chance of at Least Some Snow on the Ground in October
The probability that there is snow on the ground.
The snow is typically at its deepest on October 31, with a median depth of 4.5"; the depth exceeds 4.5" only one year out of ten.
Snow Depth When there is Snow on the Ground in October
The median depth of snow during times when there is at least some snow on the ground, with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Humidity
The relative humidity typically ranges from 65% (mildly humid) to 93% (very humid) over the course of a typical October, rarely dropping below 50% (comfortable) and reaching as high as 100% (very humid).
The air is driest around October 2, at which time the relative humidity drops below 73% (humid) three days out of four; it is most humid around October 1, rising above 90% (very humid) three days out of four.
Relative Humidity in October
The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).
Dew Point
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 October, the dew point typically varies from 24°F (dry) to 39°F (dry) and is rarely below 15°F (dry) or above 46°F (dry).
Dew Point in October
The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Wind
Over the course of October typical wind speeds vary from 0 mph to 18 mph (calm to fresh breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around October 30, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around October 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
Wind Speed in October
The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Wind Directions in October
The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.
Fraction of Time Spent with Various Wind Directions in October
The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.