Average Weather at Alta Lufthavn Norway
At Alta Lufthavn, the summers are short, cool, and mostly cloudy and the winters are long, freezing, snowy, windy, and overcast. Over the course of the year, the temperature typically varies from 12°F to 62°F and is rarely below -4°F or above 74°F.
Based on the tourism score, the best time of year to visit Alta Lufthavn for warm-weather activities is from mid July to early August.
The warm season lasts for 2.7 months, from June 14 to September 4, with an average daily high temperature above 55°F. The hottest day of the year is July 24, with an average high of 62°F and low of 51°F.
The cold season lasts for 4.2 months, from November 14 to March 21, with an average daily high temperature below 31°F. The coldest day of the year is January 25, with an average low of 12°F and high of 24°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Dillingham, Alaska, United States (3,526 miles away) and Petropavlovsk-Kamchatsky, Russia (3,652 miles) are the far-away foreign places with temperatures most similar to Alta Lufthavn (view comparison).
At Alta Lufthavn, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year at Alta Lufthavn begins around April 13 and lasts for 5.2 months, ending around September 19. On June 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 40% of the time, and overcast or mostly cloudy 60% of the time.
The cloudier part of the year begins around September 19 and lasts for 6.8 months, ending around April 13. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 82% of the time, and clear, mostly clear, or partly cloudy 18% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Alta Lufthavn varies throughout the year.
The wetter season lasts 5.5 months, from May 26 to November 9, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 38% on October 21.
The drier season lasts 6.5 months, from November 9 to May 26. The smallest chance of a wet day is 22% on March 9.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation at Alta Lufthavn changes throughout the year.
Rain alone is the most common for 7.1 months, from April 7 to November 8. The highest chance of a day with rain alone is 38% on June 20.
Snow alone is the most common for 4.9 months, from November 8 to April 7. The highest chance of a day with snow alone is 19% on February 5.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Alta Lufthavn experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.0 months, from March 31 to November 29, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 13, with an average total accumulation of 2.7 inches.
The rainless period of the year lasts for 4.1 months, from November 29 to March 31. The least rain falls around February 25, with an average total accumulation of 0.3 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Alta Lufthavn experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 7.2 months, from October 2 to May 7, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 28, with an average total liquid-equivalent accumulation of 1.0 inches.
The snowless period of the year lasts for 4.8 months, from May 7 to October 2. The least snow falls around July 23, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
Due to its extreme latitude, Alta Lufthavn experiences polar day (also known as the midnight Sun) during the summer and polar night during the winter. These are periods of time in which the sun is continuously above or below the horizon for more than one day. 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 the summer at Alta Lufthavn during 2018, the Sun is continuously above the horizon for 2.4 months, rising at 12:52 AM on May 16, and not setting again until 12:06 AM on July 28.
In the winter at Alta Lufthavn during 2018, the Sun is continuously below the horizon for 1.7 months, setting at 11:33 AM on November 25, and not rising again until 11:08 AM on January 17.
Hours of Daylight and Twilight
Daylight saving time (DST) is observed at Alta Lufthavn during 2018, starting in the spring on March 25, lasting 7.1 months, and ending in the fall on October 28.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level at Alta Lufthavn, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed at Alta Lufthavn experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.7 months, from October 31 to April 20, with average wind speeds of more than 10.6 miles per hour. The windiest day of the year is January 28, with an average hourly wind speed of 13.6 miles per hour.
The calmer time of year lasts for 6.4 months, from April 20 to October 31. The calmest day of the year is August 13, with an average hourly wind speed of 7.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Alta Lufthavn varies throughout the year.
The wind is most often from the west for 1.5 months, from May 22 to July 7, with a peak percentage of 32% on June 4. The wind is most often from the south for 10 months, from July 7 to May 22, with a peak percentage of 48% on January 1.
Alta Lufthavn is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.3 months, from July 7 to September 16, with an average temperature above 48°F. The day of the year with the warmest water is August 7, with an average temperature of 51°F.
The time of year with cooler water lasts for 4.6 months, from December 31 to May 18, with an average temperature below 40°F. The day of the year with the coolest water is March 31, with an average temperature of 38°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is at Alta Lufthavn throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Alta Lufthavn for general outdoor tourist activities is from mid July to early August, with a peak score in the last week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Alta Lufthavn for hot-weather activities is from mid to late July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season at Alta Lufthavn typically lasts for 4.5 months (138 days), from around May 13 to around September 28, rarely starting before April 27 or after May 29, and rarely ending before September 11 or after October 18.
Time Spent in Various Temperature Bands and the Growing Season
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
Based on growing degree days alone, the first spring blooms at Alta Lufthavn should appear around June 26, only rarely appearing before June 10 or after July 15.
Growing Degree Days
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 2.6 months, from May 10 to July 29, with an average daily incident shortwave energy per square meter above 4.2 kWh. The brightest day of the year is June 24, with an average of 5.2 kWh.
The darker period of the year lasts for 5.4 months, from September 29 to March 10, with an average daily incident shortwave energy per square meter below 1.0 kWh. The darkest day of the year is January 1, with an average of 0.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Alta Lufthavn are 69.976 deg latitude, 23.372 deg longitude, and 3 ft elevation.
The topography within 2 miles of Alta Lufthavn contains only modest variations in elevation, with a maximum elevation change of 482 feet and an average elevation above sea level of 43 feet. Within 10 miles contains only modest variations in elevation (2,707 feet). Within 50 miles contains large variations in elevation (4,373 feet).
The area within 2 miles of Alta Lufthavn is covered by water (34%), artificial surfaces (25%), trees (18%), and cropland (14%), within 10 miles by trees (37%) and sparse vegetation (27%), and within 50 miles by sparse vegetation (39%) and water (17%).
This report illustrates the typical weather at Alta Lufthavn, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
Alta Lufthavn has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.