Average Weather in September in Evjen Norway
Daily high temperatures decrease by 5°F, from 55°F to 49°F, rarely falling below 44°F or exceeding 61°F.
Daily low temperatures decrease by 5°F, from 48°F to 44°F, rarely falling below 38°F or exceeding 53°F.
For reference, on July 27, the hottest day of the year, temperatures in Evjen typically range from 50°F to 58°F, while on February 19, the coldest day of the year, they range from 30°F to 36°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in September
The month of September in Evjen experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 60% to 65%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 40% of the time.
For reference, on January 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on June 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Evjen, the chance of a wet day over the course of September is rapidly increasing, starting the month at 35% and ending it at 42%.
For reference, the year's highest daily chance of a wet day is 50% on December 5, and its lowest chance is 22% on June 5.
Probability of Precipitation in September
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during September in Evjen is increasing, starting the month at 2.6 inches, when it rarely exceeds 4.4 inches or falls below 0.9 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.5 inches or falls below 1.3 inches.
Average Monthly Rainfall in September
Due to its extreme latitude, Evjen 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.
Neither polar day nor polar night occur during the month of September.
Over the course of September in Evjen, 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 3 hours, 49 minutes, implying an average daily decrease of 7 minutes, 54 seconds, and weekly decrease of 55 minutes, 17 seconds.
The shortest day of the month is September 30, with 11 hours, 20 minutes of daylight and the longest day is September 1, with 15 hours, 9 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Evjen is 5:29 AM on September 1 and the latest sunrise is 1 hour, 45 minutes later at 7:14 AM on September 30.
The latest sunset is 8:38 PM on September 1 and the earliest sunset is 2 hours, 4 minutes earlier at 6:34 PM on September 30.
Daylight saving time is observed in Evjen during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
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 chance that a given day will be muggy in Evjen is essentially constant during September, remaining around 0% throughout.
Humidity Comfort Levels in September
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 in Evjen is rapidly increasing during September, increasing from 12.2 miles per hour to 14.8 miles per hour over the course of the month.
For reference, on January 23, the windiest day of the year, the daily average wind speed is 18.4 miles per hour, while on July 29, the calmest day of the year, the daily average wind speed is 10.7 miles per hour.
Average Wind Speed in September
Wind Direction in September
Evjen 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 surface water temperature in Evjen is gradually decreasing during September, falling by 3°F, from 53°F to 50°F, over the course of the month.
Average Water Temperature in September
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 in Evjen typically lasts for 6.1 months (187 days), from around April 25 to around October 29, rarely starting before April 6 or after May 18, and rarely ending before October 7 or after November 23.
The month of September in Evjen is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 96% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
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.
The average accumulated growing degree days in Evjen are gradually increasing during September, increasing by 45°F, from 312°F to 357°F, over the course of the month.
Growing Degree Days in September
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 in Evjen is rapidly decreasing during September, falling by 1.6 kWh, from 2.8 kWh to 1.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Evjen are 68.267 deg latitude, 13.733 deg longitude, and 85 ft elevation.
The topography within 2 miles of Evjen contains large variations in elevation, with a maximum elevation change of 2,425 feet and an average elevation above sea level of 367 feet. Within 10 miles also contains large variations in elevation (3,038 feet). Within 50 miles contains large variations in elevation (4,042 feet).
The area within 2 miles of Evjen is covered by shrubs (35%), sparse vegetation (22%), water (15%), and herbaceous vegetation (12%), within 10 miles by water (53%) and sparse vegetation (14%), and within 50 miles by water (85%).
This report illustrates the typical weather in Evjen year round, 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
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Evjen.
For each station, the records are corrected for the elevation difference between that station and Evjen according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Evjen is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Evjen and a given station.
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.