Fall Weather at Rovaniemi Airport Finland

Daily high temperatures decrease by 32°F, from 56°F to 24°F, rarely falling below 8°F or exceeding 65°F.

Daily low temperatures decrease by 30°F, from 44°F to 14°F, rarely falling below -4°F or exceeding 51°F.

For reference, on July 20, the hottest day of the year, temperatures at Rovaniemi Airport typically range from 53°F to 67°F, while on January 21, the coldest day of the year, they range from 6°F to 17°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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.

Dillingham, United States (3,760 miles away); Y, United States (3,544 miles); and Maliotenam, Canada (3,174 miles) are the far-away foreign places with temperatures most similar to Rovaniemi Airport (view comparison).

© OpenStreetMap contributors

Compare Rovaniemi Airport to another city:

CompareMap

The fall at Rovaniemi Airport experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 61% to 82%.

The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 39% of the time.

For reference, on January 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 85%, while on July 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 50%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Rovaniemi Airport, the chance of a wet day over the course of the fall is rapidly decreasing, starting the season at 29% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 35% on July 25, and its lowest chance is 15% on March 2.

Over the course of the fall at Rovaniemi Airport, the chance of a day with only rain decreases from 29% to 5%, the chance of a day with mixed snow and rain increases from 0% to 5%, and the chance of a day with only snow increases from 0% to 13%.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall at Rovaniemi Airport is rapidly decreasing, starting the season at 2.2 inches, when it rarely exceeds 3.7 inches or falls below 0.9 inches, and ending the season at 0.4 inches, when it rarely exceeds 0.9 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during the fall at Rovaniemi Airport is very rapidly increasing, starting the season at 0.0 inches, when it rarely exceeds 0.0 inches, and ending the season at 7.0 inches, when it rarely exceeds 12.2 inches or falls below 2.0 inches.

Due to its extreme latitude, Rovaniemi Airport experiences polar day (also known as the midnight Sun) during the summer. 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 fall.

Over the course of the fall at Rovaniemi Airport, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 11 hours, 4 minutes, implying an average daily decrease of 7 minutes, 22 seconds, and weekly decrease of 51 minutes, 37 seconds.

The shortest day of the fall is November 30, with 3 hours, 46 minutes of daylight and the longest day is September 1, with 14 hours, 50 minutes of daylight.

The earliest sunrise of the fall at Rovaniemi Airport is 5:50 AM on September 1 and the latest sunrise is 4 hours, 22 minutes later at 10:12 AM on November 30.

The latest sunset is 8:40 PM on September 1 and the earliest sunset is 6 hours, 42 minutes earlier at 1:58 PM on November 30.

Daylight saving time (DST) starts at 3:00 AM on October 27, 2024, shifting sunrise and sunset to be an hour later.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the fall of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 at Rovaniemi Airport is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 14, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Rovaniemi Airport is increasing during the fall, increasing from 4.3 miles per hour to 5.3 miles per hour over the course of the season.

For reference, on February 29, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.

The hourly average wind direction at Rovaniemi Airport throughout the fall is predominantly from the south, with a peak proportion of 44% on November 23.

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 Rovaniemi Airport typically lasts for 4.1 months (126 days), from around May 17 to around September 21, rarely starting before April 30 or after June 3, and rarely ending before September 2 or after October 9.

During the fall at Rovaniemi Airport, the chance that a given day is within the growing season is very rapidly decreasing falling from 92% to -0% over the course of the season.

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 at Rovaniemi Airport are gradually increasing during the fall, increasing by 39°F, from 749°F to 788°F, over the course of the season.

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 at Rovaniemi Airport is very rapidly decreasing during the fall, falling by 2.8 kWh, from 2.9 kWh to 0.0 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Rovaniemi Airport are 66.565 deg latitude, 25.830 deg longitude, and 646 ft elevation.

The topography within 2 miles of Rovaniemi Airport contains only modest variations in elevation, with a maximum elevation change of 289 feet and an average elevation above sea level of 544 feet. Within 10 miles contains only modest variations in elevation (623 feet). Within 50 miles contains significant variations in elevation (1,706 feet).

The area within 2 miles of Rovaniemi Airport is covered by trees (84%) and artificial surfaces (16%), within 10 miles by trees (82%), and within 50 miles by trees (86%).