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5. December

Average Weather in December in Jinchuan China

Daily high temperatures decrease by 7°F, from 52°F to 44°F, rarely falling below 34°F or exceeding 61°F.

Daily low temperatures decrease by 6°F, from 33°F to 27°F, rarely falling below 18°F or exceeding 43°F.

For reference, on July 31, the hottest day of the year, temperatures in Jinchuan typically range from 70°F to 83°F, while on January 19, the coldest day of the year, they range from 26°F to 42°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.

Lexington-Fayette, Kentucky, United States (7,510 miles away) and Philadelphia, Pennsylvania, United States (7,530 miles) are the far-away foreign places with temperatures most similar to Jinchuan (view comparison).

The month of December in Jinchuan experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 34% on December 17.

The clearest day of the month is December 17, with clear, mostly clear, or partly cloudy conditions 66% of the time.

For reference, on July 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on October 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Jinchuan, the chance of a wet day over the course of December is essentially constant, remaining around 18% throughout.

For reference, the year's highest daily chance of a wet day is 55% on June 30, and its lowest chance is 16% on December 18.

Over the course of December in Jinchuan, the chance of a day with only rain decreases from 15% to 10%, the chance of a day with mixed snow and rain increases from 3% to 6%, and the chance of a day with only snow increases from 1% to 3%.

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 Jinchuan is decreasing, starting the month at 1.7 inches, when it rarely exceeds 3.6 inches or falls below 0.3 inches, and ending the month at 1.1 inches, when it rarely exceeds 2.2 inches or falls below 0.1 inches.

The lowest average 31-day accumulation is 1.1 inches on December 29.

Snowfall

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

The average sliding 31-day liquid-equivalent snowfall during December in Jinchuan is gradually increasing, starting the month at 0.2 inches, when it rarely exceeds 0.5 inches, and ending the month at 0.5 inches, when it rarely exceeds 1.2 inches.

Over the course of December in Jinchuan, the length of the day is essentially constant. The shortest day of the month is December 22, with 10 hours, 13 minutes of daylight and the longest day is December 1, with 10 hours, 22 minutes of daylight.

The earliest sunrise of the month in Jinchuan is 6:42 AM on December 1 and the latest sunrise is 18 minutes later at 6:59 AM on December 31.

The earliest sunset is 5:04 PM on December 2 and the latest sunset is 10 minutes later at 5:14 PM on December 31.

Daylight saving time is not observed in Jinchuan during 2019.

For reference, on June 21, the longest day of the year, the Sun rises at 5:03 AM and sets 14 hours, 5 minutes later, at 7:08 PM, while on December 22, the shortest day of the year, it rises at 6:56 AM and sets 10 hours, 13 minutes later, at 5:09 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 Jinchuan is essentially constant during December, remaining around 0% throughout.

The lowest chance of a muggy day during December is 0% on December 22.

For reference, on July 24, the muggiest day of the year, there are muggy conditions 99% of the time, while on December 12, 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 Jinchuan is essentially constant during December, remaining around 6.3 miles per hour throughout.

For reference, on March 10, the windiest day of the year, the daily average wind speed is 7.4 miles per hour, while on August 25, the calmest day of the year, the daily average wind speed is 5.9 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 Jinchuan typically lasts for 7.4 months (224 days), from around March 31 to around November 11, rarely starting before March 12 or after April 18, and rarely ending before October 25 or after November 28.

The month of December in Jinchuan is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually decreasing from 7% to 0% 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 Jinchuan are essentially constant during December, remaining within 7°F of 3,787°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 Jinchuan is essentially constant during December, remaining within 0.1 kWh of 3.1 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 3.0 kWh on December 29.

For the purposes of this report, the geographical coordinates of Jinchuan are 29.979 deg latitude, 118.846 deg longitude, and 2,175 ft elevation.

The topography within 2 miles of Jinchuan contains large variations in elevation, with a maximum elevation change of 2,444 feet and an average elevation above sea level of 2,160 feet. Within 10 miles contains large variations in elevation (5,348 feet). Within 50 miles also contains extreme variations in elevation (5,988 feet).

The area within 2 miles of Jinchuan is covered by trees (93%), within 10 miles by trees (88%), and within 50 miles by trees (79%).