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6. December

Average Weather in December in Trun France

Daily high temperatures decrease by 2°F, from 47°F to 45°F, rarely falling below 34°F or exceeding 56°F.

Daily low temperatures are around 36°F, rarely falling below 24°F or exceeding 47°F.

For reference, on August 3, the hottest day of the year, temperatures in Trun typically range from 55°F to 75°F, while on February 8, the coldest day of the year, they range from 34°F to 46°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.

Surrey, Canada (4,870 miles away) is the far-away foreign place with temperatures most similar to Trun (view comparison).

The month of December in Trun experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 69% throughout the month.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 33% of the time.

For reference, on January 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 61%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Trun, the chance of a wet day over the course of December is gradually increasing, starting the month at 30% and ending it at 33%.

For reference, the year's highest daily chance of a wet day is 33% on December 30, and its lowest chance is 19% on August 27.

Over the course of December in Trun, the chance of a day with only rain increases from 29% to 31%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.

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 Trun is essentially constant, remaining about 2.0 inches throughout, and rarely exceeding 3.3 inches or falling below 0.7 inches.

The highest average 31-day accumulation is 2.0 inches on December 16.

Over the course of December in Trun, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 15 minutes, implying an average daily decrease of 31 seconds, and weekly decrease of 3 minutes, 37 seconds.

The shortest day of the month is December 22, with 8 hours, 15 minutes of daylight and the longest day is December 1, with 8 hours, 35 minutes of daylight.

The earliest sunrise of the month in Trun is 8:31 AM on December 1 and the latest sunrise is 22 minutes later at 8:53 AM on December 31.

The earliest sunset is 5:03 PM on December 12 and the latest sunset is 9 minutes later at 5:12 PM on December 31.

Daylight saving time is observed in Trun during 2019, 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 5:56 AM and sets 16 hours, 11 minutes later, at 10:07 PM, while on December 22, the shortest day of the year, it rises at 8:50 AM and sets 8 hours, 15 minutes later, at 5:05 PM.

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 Trun is essentially constant during December, remaining around 0% throughout.

For reference, on July 23, the muggiest day of the year, there are muggy conditions 4% 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 Trun is increasing during December, increasing from 11.4 miles per hour to 12.5 miles per hour over the course of the month.

For reference, on January 16, the windiest day of the year, the daily average wind speed is 12.6 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 8.5 miles per hour.

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 Trun typically lasts for 6.9 months (211 days), from around April 11 to around November 9, rarely starting before March 20 or after April 30, and rarely ending before October 14 or after December 9.

The month of December in Trun is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season decreasing from 16% to 1% over the course of the month.

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 Trun are essentially constant during December, remaining within 6°F of 2,031°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 Trun is essentially constant during December, remaining within 0.1 kWh of 0.9 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 0.8 kWh on December 28.

For the purposes of this report, the geographical coordinates of Trun are 48.843 deg latitude, 0.033 deg longitude, and 348 ft elevation.

The topography within 2 miles of Trun contains only modest variations in elevation, with a maximum elevation change of 243 feet and an average elevation above sea level of 320 feet. Within 10 miles contains only modest variations in elevation (833 feet). Within 50 miles also contains very significant variations in elevation (1,493 feet).

The area within 2 miles of Trun is covered by cropland (70%) and grassland (23%), within 10 miles by grassland (43%) and cropland (42%), and within 50 miles by cropland (41%) and grassland (36%).