Average Weather in January in Longtan China
Daily high temperatures are around 50°F, rarely falling below 38°F or exceeding 62°F. The lowest daily average high temperature is 49°F on January 19.
Daily low temperatures are around 33°F, rarely falling below 26°F or exceeding 42°F. The lowest daily average low temperature is 32°F on January 19.
For reference, on July 30, the hottest day of the year, temperatures in Longtan typically range from 76°F to 90°F, while on January 19, the coldest day of the year, they range from 32°F to 49°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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.
Average Hourly Temperature in January
The month of January in Longtan experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 32% to 36%.
The clearest day of the month is January 1, with clear, mostly clear, or partly cloudy conditions 68% of the time.
For reference, on July 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on December 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Longtan, the chance of a wet day over the course of January is gradually increasing, starting the month at 15% and ending it at 17%.
For reference, the year's highest daily chance of a wet day is 43% on April 20, and its lowest chance is 12% on December 18.
Over the course of January in Longtan, the chance of a day with only rain remains an essentially constant 11% throughout, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in January
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 January in Longtan is gradually increasing, starting the month at 0.9 inches, when it rarely exceeds 1.9 inches or falls below 0.1 inches, and ending the month at 1.3 inches, when it rarely exceeds 2.4 inches or falls below 0.2 inches.
Average Monthly Rainfall in January
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 January in Longtan is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.6 inches or falling below -0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.2 inches on January 30.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Longtan, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 28 minutes, implying an average daily increase of 56 seconds, and weekly increase of 6 minutes, 35 seconds.
The shortest day of the month is January 1, with 10 hours, 20 minutes of daylight and the longest day is January 31, with 10 hours, 48 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Longtan is 7:30 AM on January 11 and the earliest sunrise is 5 minutes earlier at 7:24 AM on January 31.
The earliest sunset is 5:48 PM on January 1 and the latest sunset is 24 minutes later at 6:13 PM on January 31.
Daylight saving time is not observed in Longtan during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:37 AM and sets 13 hours, 60 minutes later, at 7:37 PM, while on December 21, the shortest day of the year, it rises at 7:24 AM and sets 10 hours, 18 minutes later, at 5:42 PM.
Sunrise & Sunset with Twilight in January
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 Longtan is essentially constant during January, remaining around 0% throughout.
For reference, on July 23, the muggiest day of the year, there are muggy conditions 100% of the time, while on December 11, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
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 Longtan is essentially constant during January, remaining within 0.2 miles per hour of 6.3 miles per hour throughout.
For reference, on March 10, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on June 11, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
Average Wind Speed in January
Wind Direction in January
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 Longtan typically lasts for 9.3 months (281 days), from around February 28 to around December 6, rarely starting before February 6 or after March 19, and rarely ending before November 16 or after December 25.
The month of January in Longtan is very likely fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of -0% on January 14.
Time Spent in Various Temperature Bands and the Growing Season in January
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 Longtan are essentially constant during January, remaining within 12°F of 12°F throughout.
Growing Degree Days in January
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 Longtan is essentially constant during January, remaining within 0.2 kWh of 3.0 kWh throughout.
The lowest average daily incident shortwave solar energy during January is 2.8 kWh on January 7.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Longtan are 28.962 deg latitude, 111.131 deg longitude, and 459 ft elevation.
The topography within 2 miles of Longtan contains significant variations in elevation, with a maximum elevation change of 673 feet and an average elevation above sea level of 474 feet. Within 10 miles contains significant variations in elevation (2,736 feet). Within 50 miles contains large variations in elevation (5,023 feet).
The area within 2 miles of Longtan is covered by trees (54%) and cropland (37%), within 10 miles by trees (72%) and cropland (18%), and within 50 miles by trees (62%) and cropland (20%).
This report illustrates the typical weather in Longtan year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Longtan is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Longtan, according to the International Standard Atmosphere .
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.