Average Weather In July For Tromsø, Norway
Location
This report describes the typical weather at the Tromsø Airport (Tromsø, Norway) weather station over the course of an average July. 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 July is characterized by gradually rising daily high temperatures, with daily highs around 58°F throughout the month, exceeding 69°F or dropping below 48°F only one day in ten.
Daily High and Low Temperature in July
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 July
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 July, 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 2:55 hours, implying an average day-over-day decrease of 5.6 minutes.
The shortest day of the month is July 31 with 21:06 hours of daylight; the longest day is July 2 with 24:00 hours of daylight.
Due to its extreme latitude, Tromsø experiences polar day during summer. During this period of time, the Sun remains continuously above the horizon for a prolonged period of time.
July begins in polar day, which lasts until July 25.
Daily Hours of Daylight and Twilight in July
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 1:14am on July 26; the latest sunset is at 12:29am on July 25; the latest sunrise is at 2:15am on July 31; the earliest sunset is at 11:21pm on July 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in July, so the entire month is in daylight time.
Daily Sunrise & Sunset with Twilight and Daylight Savings Time in July
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 87% (mostly cloudy) and does not vary substantially over the course of the month.
Median Cloud Cover in July
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 July 16, a representative day, the sky is clear or mostly clear 19% of the time, partly cloudy 19% of the time, and mostly cloudy or overcast 53% of the time.
Cloud Cover Types in July
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 64%, with little variation over the course of the month.
Probability of Precipitation at Some Point in the Day in July
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 July, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 70% of those days with precipitation. It is most likely around July 8, when it is observed during 45% of all days.
Light rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around July 24, when it is observed during 14% of all days.
Types of Precipitation Throughout July
Relative frequency of various types of precipitation over the course of a typical July.
Snow
The likelihood of snow falling is highest around July 1, occurring in 2% of days.
Probability of Snow Fall Being Reported in a Given Day in July
Probability that snow will be reported at least once in a given day.
Either snow rarely accumulates at this location in July or snow depth measurements are unavailable or unreliable.
Humidity
The relative humidity typically ranges from 60% (mildly humid) to 94% (very humid) over the course of a typical July, rarely dropping below 42% (comfortable) and reaching as high as 100% (very humid).
The air is driest around July 1, at which time the relative humidity drops below 70% (humid) three days out of four; it is most humid around July 31, rising above 90% (very humid) three days out of four.
Relative Humidity in July
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 July, the dew point typically varies from 40°F (dry) to 50°F (very comfortable) and is rarely below 34°F (dry) or above 56°F (comfortable).
Dew Point in July
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 July typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around July 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around July 28, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
Wind Speed in July
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 July
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 July
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.