Winter Weather in Heixi China

Daily high temperatures are around 50°F, rarely falling below 38°F or exceeding 64°F. The lowest daily average high temperature is 47°F on January 19.

Daily low temperatures are around 40°F, rarely falling below 31°F or exceeding 50°F. The lowest daily average low temperature is 37°F on January 19.

For reference, on July 25, the hottest day of the year, temperatures in Heixi typically range from 75°F to 87°F, while on January 19, the coldest day of the year, they range from 37°F to 47°F.

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

East Hampton, United States (7,829 miles away); Ulcinj, Montenegro (4,859 miles); and Hashtpar, Iran (3,420 miles) are the far-away foreign places with temperatures most similar to Heixi (view comparison).

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The winter in Heixi experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 42% to 52%. The lowest chance of overcast or mostly cloudy conditions is 38% on January 14.

The clearest day of the winter is January 14, with clear, mostly clear, or partly cloudy conditions 62% of the time.

For reference, on July 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on January 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Heixi, the chance of a wet day over the course of the winter is increasing, starting the season at 12% and ending it at 17%.

For reference, the year's highest daily chance of a wet day is 51% on June 20, and its lowest chance is 7% on December 29.

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 winter in Heixi is essentially constant, remaining about 0.7 inches throughout, and rarely exceeding 1.9 inches.

The lowest average 31-day accumulation is 0.4 inches on December 27.

Over the course of the winter in Heixi, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 9 minutes, implying an average daily increase of 46 seconds, and weekly increase of 5 minutes, 23 seconds.

The shortest day of the winter is December 21, with 10 hours, 15 minutes of daylight and the longest day is February 28, with 11 hours, 32 minutes of daylight.

The latest sunrise of the winter in Heixi is 7:42 AM on January 11 and the earliest sunrise is 29 minutes earlier at 7:12 AM on February 28.

The earliest sunset is 5:46 PM on December 2 and the latest sunset is 58 minutes later at 6:44 PM on February 28.

Daylight saving time is not observed in Heixi during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:46 AM and sets 14 hours, 3 minutes later, at 7:48 PM, while on December 21, the shortest day of the year, it rises at 7:36 AM and sets 10 hours, 15 minutes later, at 5:51 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 the winter 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 in Heixi is essentially constant during the winter, remaining around 0% throughout.

For reference, on July 23, the muggiest day of the year, there are muggy conditions 97% 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 Heixi is increasing during the winter, increasing from 4.7 miles per hour to 6.0 miles per hour over the course of the season.

For reference, on March 9, the windiest day of the year, the daily average wind speed is 6.3 miles per hour, while on October 17, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.

The lowest daily average wind speed during the winter is 4.7 miles per hour on December 11.

The wind direction in Heixi during the winter is predominantly out of the east from December 1 to January 3 and from February 3 to February 28 and the south from January 3 to February 3.

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 Heixi typically lasts for 11 months (327 days), from around February 4 to around December 27, rarely starting after March 2, or ending before December 4.

The smallest chance that a given day will be within the growing season in Heixi during the winter is 27% on January 16.

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 Heixi are very rapidly decreasing during the winter, decreasing by 4,852°F, from 4,896°F to 44°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 in Heixi is gradually increasing during the winter, rising by 0.9 kWh, from 2.7 kWh to 3.6 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 2.7 kWh on December 23.

For the purposes of this report, the geographical coordinates of Heixi are 29.621 deg latitude, 108.541 deg longitude, and 1,240 ft elevation.

The topography within 2 miles of Heixi contains very significant variations in elevation, with a maximum elevation change of 1,864 feet and an average elevation above sea level of 1,819 feet. Within 10 miles contains very significant variations in elevation (4,541 feet). Within 50 miles also contains extreme variations in elevation (6,096 feet).

The area within 2 miles of Heixi is covered by grassland (53%) and cropland (47%), within 10 miles by grassland (46%) and cropland (33%), and within 50 miles by trees (47%) and grassland (23%).