Climate and Average Weather Year Round in Dongmen China

In Dongmen, the summers are long, warm, oppressive, wet, and mostly cloudy and the winters are short, cold, and mostly clear. Over the course of the year, the temperature typically varies from 39°F to 87°F and is rarely below 30°F or above 90°F.

Based on the tourism score, the best time of year to visit Dongmen for warm-weather activities is from mid September to late October.

The hot season lasts for 5.3 months, from April 25 to October 2, with an average daily high temperature above 81°F. The hottest month of the year in Dongmen is July, with an average high of 86°F and low of 74°F.

The cool season lasts for 2.4 months, from December 6 to February 17, with an average daily high temperature below 63°F. The coldest month of the year in Dongmen is January, with an average low of 39°F and high of 58°F.

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

The clearer part of the year in Dongmen begins around September 12 and lasts for 7.9 months, ending around May 8.

The clearest month of the year in Dongmen is December, during which on average the sky is clear, mostly clear, or partly cloudy 72% of the time.

The cloudier part of the year begins around May 8 and lasts for 4.1 months, ending around September 12.

The cloudiest month of the year in Dongmen is July, during which on average the sky is overcast or mostly cloudy 78% 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 Dongmen varies significantly throughout the year.

The wetter season lasts 5.2 months, from March 25 to August 31, with a greater than 33% chance of a given day being a wet day. The month with the most wet days in Dongmen is June, with an average of 16.2 days with at least 0.04 inches of precipitation.

The drier season lasts 6.8 months, from August 31 to March 25. The month with the fewest wet days in Dongmen is December, with an average of 3.2 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. The month with the most days of rain alone in Dongmen is June, with an average of 16.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 56% on June 21.

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. Dongmen experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Dongmen. The month with the most rain in Dongmen is June, with an average rainfall of 10.9 inches.

The month with the least rain in Dongmen is December, with an average rainfall of 0.9 inches.

The length of the day in Dongmen varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 36 minutes of daylight; the longest day is June 21, with 13 hours, 41 minutes of daylight.

The earliest sunrise is at 5:54 AM on June 9, and the latest sunrise is 1 hour, 36 minutes later at 7:30 AM on January 14. The earliest sunset is at 5:54 PM on November 29, and the latest sunset is 1 hour, 43 minutes later at 7:37 PM on July 2.

Daylight saving time (DST) is not observed in Dongmen 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.

Dongmen experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.7 months, from March 31 to October 20, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Dongmen is July, with 30.9 days that are muggy or worse.

The month with the fewest muggy days in Dongmen is January, with 0.0 days that are muggy or worse.

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 Dongmen experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.7 months, from November 27 to May 17, with average wind speeds of more than 7.7 miles per hour. The windiest month of the year in Dongmen is March, with an average hourly wind speed of 9.2 miles per hour.

The calmer time of year lasts for 6.3 months, from May 17 to November 27. The calmest month of the year in Dongmen is August, with an average hourly wind speed of 6.2 miles per hour.

The predominant average hourly wind direction in Dongmen varies throughout the year.

The wind is most often from the south for 5.7 months, from March 8 to August 30, with a peak percentage of 75% on July 9. The wind is most often from the north for 6.3 months, from August 30 to March 8, with a peak percentage of 55% on January 1.

To characterize how pleasant the weather is in Dongmen 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 Dongmen for general outdoor tourist activities is from mid September to late October, with a peak score in the first week of October.

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 Dongmen for hot-weather activities is from mid July to late September, with a peak score in the first week of September.

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).

The growing season in Dongmen typically lasts for 11 months (323 days), from around February 3 to around December 23, rarely starting after February 27, or ending before December 3.

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 Dongmen should appear around January 30, only rarely appearing before January 19 or after February 16.

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 5.5 months, from April 19 to October 1, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest month of the year in Dongmen is July, with an average of 5.7 kWh.

The darker period of the year lasts for 2.5 months, from November 25 to February 11, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest month of the year in Dongmen is January, with an average of 3.3 kWh.

For the purposes of this report, the geographical coordinates of Dongmen are 24.792 deg latitude, 108.900 deg longitude, and 1,142 ft elevation.

The topography within 2 miles of Dongmen contains very significant variations in elevation, with a maximum elevation change of 974 feet and an average elevation above sea level of 1,213 feet. Within 10 miles contains very significant variations in elevation (3,497 feet). Within 50 miles also contains extreme variations in elevation (6,650 feet).

The area within 2 miles of Dongmen is covered by cropland (38%), trees (36%), and artificial surfaces (15%), within 10 miles by trees (68%) and cropland (12%), and within 50 miles by trees (62%) and grassland (15%).