December Weather in Falun Sweden

Daily high temperatures decrease by 4°F, from 33°F to 29°F, rarely falling below 14°F or exceeding 43°F.

Daily low temperatures decrease by 5°F, from 24°F to 19°F, rarely falling below -1°F or exceeding 36°F.

For reference, on July 20, the hottest day of the year, temperatures in Falun typically range from 52°F to 70°F, while on February 9, the coldest day of the year, they range from 17°F to 29°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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.

Haines, Alaska, United States (4,017 miles away); Smithers, British Columbia, Canada (4,213 miles); and Black Diamond, Alberta, Canada (4,264 miles) are the far-away foreign places with temperatures most similar to Falun (view comparison).

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The month of December in Falun experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 74% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 72% on December 27.

The clearest day of the month is December 27, with clear, mostly clear, or partly cloudy conditions 28% of the time.

For reference, on November 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on July 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 52%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Falun, the chance of a wet day over the course of December is gradually decreasing, starting the month at 25% and ending it at 23%.

For reference, the year's highest daily chance of a wet day is 36% on August 20, and its lowest chance is 16% on February 27.

Over the course of December in Falun, the chance of a day with only rain decreases from 13% to 7%, the chance of a day with mixed snow and rain remains an essentially constant 5% throughout, and the chance of a day with only snow increases from 7% to 11%.

Rainfall

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 December in Falun is gradually decreasing, starting the month at 0.9 inches, when it rarely exceeds 1.7 inches or falls below 0.2 inches, and ending the month at 0.4 inches, when it rarely exceeds 1.0 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 December in Falun is increasing, starting the month at 5.5 inches, when it rarely exceeds 12.3 inches or falls below 0.6 inches, and ending the month at 6.5 inches, when it rarely exceeds 11.7 inches or falls below 1.4 inches.

Over the course of December in Falun, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 29 minutes, implying an average daily decrease of 58 seconds, and weekly decrease of 6 minutes, 43 seconds.

The shortest day of the month is December 21, with 5 hours, 40 minutes of daylight and the longest day is December 1, with 6 hours, 18 minutes of daylight.

The earliest sunrise of the month in Falun is 8:37 AM on December 1 and the latest sunrise is 30 minutes later at 9:07 AM on December 27.

The latest sunset is 2:55 PM on December 1 and the earliest sunset is 11 minutes earlier at 2:44 PM on December 16.

Daylight saving time is observed in Falun during 2026, but it neither starts nor ends during December, so the entire month is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 3:26 AM and sets 19 hours, 7 minutes later, at 10:32 PM, while on December 21, the shortest day of the year, it rises at 9:05 AM and sets 5 hours, 40 minutes later, at 2:45 PM.

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 December 2026. 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 in Falun is essentially constant during December, remaining around 0% throughout.

For reference, on July 23, 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 in Falun is essentially constant during December, remaining within 0.1 miles per hour of 5.0 miles per hour throughout.

For reference, on January 2, the windiest day of the year, the daily average wind speed is 5.2 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 in Falun throughout December is predominantly from the west, with a peak proportion of 43% on December 17.

Falun 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 Falun is gradually decreasing during December, falling by 3°F, from 39°F to 35°F, over the course of the month.

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 Falun typically lasts for 4.2 months (128 days), from around May 16 to around September 21, rarely starting before April 29 or after June 2, and rarely ending before September 3 or after October 11.

The month of December in Falun is reliably fully outside of the growing 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 in Falun are essentially constant during December, remaining around 1,134°F throughout.

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 Falun is essentially constant during December, remaining around 0.2 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 0.1 kWh on December 20.