Winter Weather in Longmen China

Daily high temperatures decrease by 4°F, from 69°F to 65°F, rarely falling below 51°F or exceeding 78°F. The lowest daily average high temperature is 62°F on January 26.

Daily low temperatures are around 49°F, rarely falling below 37°F or exceeding 60°F. The lowest daily average low temperature is 45°F on January 23.

For reference, on July 16, the hottest day of the year, temperatures in Longmen typically range from 76°F to 91°F, while on January 23, the coldest day of the year, they range from 45°F to 62°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.

Tyndall Air Force Base, United States (8,331 miles away) and Gabès, Tunisia (6,214 miles) are the far-away foreign places with temperatures most similar to Longmen (view comparison).

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The winter in Longmen experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 22% to 30%. The lowest chance of overcast or mostly cloudy conditions is 19% on December 26.

The clearest day of the winter is December 26, with clear, mostly clear, or partly cloudy conditions 81% of the time.

For reference, on June 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on December 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Longmen, the chance of a wet day over the course of the winter is very rapidly increasing, starting the season at 11% and ending it at 30%.

For reference, the year's highest daily chance of a wet day is 49% on June 9, and its lowest chance is 8% on October 25.

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 Longmen is rapidly increasing, starting the season at 1.5 inches, when it rarely exceeds 4.7 inches, and ending the season at 3.2 inches, when it rarely exceeds 6.5 inches or falls below 0.8 inches.

The lowest average 31-day accumulation is 1.1 inches on December 26.

Over the course of the winter in Longmen, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 56 minutes, implying an average daily increase of 38 seconds, and weekly increase of 4 minutes, 23 seconds.

The shortest day of the winter is December 21, with 10 hours, 35 minutes of daylight and the longest day is February 28, with 11 hours, 38 minutes of daylight.

The latest sunrise of the winter in Longmen is 6:54 AM on January 14 and the earliest sunrise is 23 minutes earlier at 6:31 AM on February 28.

The earliest sunset is 5:17 PM on December 1 and the latest sunset is 52 minutes later at 6:09 PM on February 28.

Daylight saving time is not observed in Longmen during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:18 AM and sets 13 hours, 41 minutes later, at 7:00 PM, while on December 21, the shortest day of the year, it rises at 6:48 AM and sets 10 hours, 35 minutes later, at 5:23 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 Longmen is essentially constant during the winter, remaining within 1% of 1% throughout.

The lowest chance of a muggy day during the winter is 0% on January 23.

For reference, on July 24, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 21, 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 Longmen is decreasing during the winter, decreasing from 8.4 miles per hour to 7.2 miles per hour over the course of the season.

For reference, on November 2, the windiest day of the year, the daily average wind speed is 8.5 miles per hour, while on August 23, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.

The hourly average wind direction in Longmen throughout the winter is predominantly from the north, with a peak proportion of 71% on December 8.

Longmen 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 Longmen is decreasing during the winter, falling by 7°F, from 67°F to 60°F, over the course of the season.

The lowest average surface water temperature during the winter is 59°F on February 9.

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).

While it does not do so every year, freezing temperatures are seen in Longmen over some winters. The day least likely to be in the growing season is January 12, with a 79% chance.

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 Longmen are very rapidly decreasing during the winter, decreasing by 6,199°F, from 6,498°F to 299°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 Longmen is gradually increasing during the winter, rising by 0.6 kWh, from 4.0 kWh to 4.6 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 3.9 kWh on December 23.

For the purposes of this report, the geographical coordinates of Longmen are 24.960 deg latitude, 118.089 deg longitude, and 387 ft elevation.

The topography within 2 miles of Longmen contains very significant variations in elevation, with a maximum elevation change of 1,020 feet and an average elevation above sea level of 515 feet. Within 10 miles contains very significant variations in elevation (3,799 feet). Within 50 miles also contains extreme variations in elevation (5,692 feet).

The area within 2 miles of Longmen is covered by grassland (33%), trees (23%), cropland (23%), and shrubs (11%), within 10 miles by trees (51%) and grassland (20%), and within 50 miles by trees (45%) and cropland (14%).