Climate and Average Weather Year Round in Longmen China

In Longmen, the summers are cold and partly cloudy and the winters are frigid, dry, windy, and mostly clear. Over the course of the year, the temperature typically varies from -15°F to 59°F and is rarely below -22°F or above 66°F.

Based on the tourism score, the best time of year to visit Longmen for warm-weather activities is from mid July to early August.

The warm season lasts for 3.4 months, from May 31 to September 11, with an average daily high temperature above 49°F. The hottest month of the year in Longmen is July, with an average high of 58°F and low of 31°F.

The cold season lasts for 3.4 months, from November 21 to March 1, with an average daily high temperature below 21°F. The coldest month of the year in Longmen is January, with an average low of -15°F and high of 12°F.

In Longmen, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Longmen begins around July 3 and lasts for 7.2 months, ending around February 9.

The clearest month of the year in Longmen is November, during which on average the sky is clear, mostly clear, or partly cloudy 71% of the time.

The cloudier part of the year begins around February 9 and lasts for 4.8 months, ending around July 3.

The cloudiest month of the year in Longmen is May, during which on average the sky is overcast or mostly cloudy 56% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Longmen varies significantly throughout the year.

The wetter season lasts 3.9 months, from May 19 to September 15, with a greater than 17% chance of a given day being a wet day. The month with the most wet days in Longmen is July, with an average of 9.3 days with at least 0.04 inches of precipitation.

The drier season lasts 8.1 months, from September 15 to May 19. The month with the fewest wet days in Longmen is January, with an average of 0.0 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Longmen changes throughout the year.

Snow alone is the most common for 5.6 months, from February 5 to April 27 and from October 7 to January 2. The month with the most days of snow alone in Longmen is April, with an average of 0.8 days.

Rain alone is the most common for 5.2 months, from January 2 to February 5 and from May 29 to September 29. The month with the most days of rain alone in Longmen is July, with an average of 7.9 days.

Mixed snow and rain is the most common for 1.3 months, from April 27 to May 29 and from September 29 to October 7. The month with the most days of mixed snow and rain in Longmen is June, with an average of 2.5 days.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Longmen experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 4.1 months, from May 16 to September 19, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Longmen is July, with an average rainfall of 1.9 inches.

The rainless period of the year lasts for 7.9 months, from September 19 to May 16. The month with the least rain in Longmen is December, with an average rainfall of -0.0 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Longmen experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 6.1 months, from April 14 to October 17, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Longmen is May, with an average snowfall of 2.7 inches.

The snowless period of the year lasts for 5.9 months, from October 17 to April 14. The least snow falls around January 19, with an average total accumulation of 0.0 inches.

The length of the day in Longmen varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 32 minutes of daylight; the longest day is June 21, with 14 hours, 48 minutes of daylight.

The earliest sunrise is at 4:01 AM on June 13, and the latest sunrise is 2 hours, 39 minutes later at 6:40 AM on January 7. The earliest sunset is at 4:04 PM on December 6, and the latest sunset is 2 hours, 46 minutes later at 6:50 PM on June 28.

Daylight saving time (DST) is not observed in Longmen during 2024.

The figure below presents a compact representation of key lunar data for 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.

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 perceived humidity level in Longmen, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

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 experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from October 28 to May 15, with average wind speeds of more than 9.2 miles per hour. The windiest month of the year in Longmen is March, with an average hourly wind speed of 11.7 miles per hour.

The calmer time of year lasts for 5.4 months, from May 15 to October 28. The calmest month of the year in Longmen is August, with an average hourly wind speed of 6.5 miles per hour.

The predominant average hourly wind direction in Longmen is from the west throughout the year.

To characterize how pleasant the weather is in Longmen throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Longmen for general outdoor tourist activities is from mid July to early August, with a peak score in the last week of July.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Longmen for hot-weather activities is from mid July to early August, with a peak score in the last week of July.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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).

Temperatures in Longmen are sufficiently cold year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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.

Based on growing degree days alone, the first spring blooms in Longmen should appear around July 29, only rarely appearing before July 14 or after August 23.

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.7 months, from April 8 to August 30, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year in Longmen is July, with an average of 7.4 kWh.

The darker period of the year lasts for 2.8 months, from November 8 to February 3, with an average daily incident shortwave energy per square meter below 3.9 kWh. The darkest month of the year in Longmen is December, with an average of 3.1 kWh.

For the purposes of this report, the geographical coordinates of Longmen are 37.878 deg latitude, 98.923 deg longitude, and 14,259 ft elevation.

The topography within 2 miles of Longmen contains large variations in elevation, with a maximum elevation change of 2,684 feet and an average elevation above sea level of 14,253 feet. Within 10 miles contains large variations in elevation (3,625 feet). Within 50 miles also contains extreme variations in elevation (6,575 feet).

The area within 2 miles of Longmen is covered by grassland (83%) and shrubs (17%), within 10 miles by grassland (83%) and shrubs (16%), and within 50 miles by grassland (77%) and shrubs (12%).