Climate and Average Weather Year Round in Yanwan ChinaIn Yanwan, the summers are comfortable and wet, the winters are freezing and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 17°F to 77°F and is rarely below 9°F or above 84°F. Based on the tourism score, the best time of year to visit Yanwan for warm-weather activities is from late June to mid August. Average Temperature in YanwanThe warm season lasts for 3.6 months, from May 19 to September 7, with an average daily high temperature above 68°F. The hottest month of the year in Yanwan is July, with an average high of 76°F and low of 60°F. The cold season lasts for 3.1 months, from November 23 to February 27, with an average daily high temperature below 42°F. The coldest month of the year in Yanwan is January, with an average low of 17°F and high of 34°F.
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Cluj-Napoca, Romania (4,272 miles away) is the far-away foreign place with temperatures most similar to Yanwan (view comparison). CloudsIn Yanwan, 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 Yanwan begins around October 29 and lasts for 3.2 months, ending around February 6. The clearest month of the year in Yanwan is December, during which on average the sky is clear, mostly clear, or partly cloudy 70% of the time. The cloudier part of the year begins around February 6 and lasts for 8.7 months, ending around October 29. The cloudiest month of the year in Yanwan is March, during which on average the sky is overcast or mostly cloudy 53% of the time.
PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Yanwan varies significantly throughout the year. The wetter season lasts 5.8 months, from April 22 to October 16, with a greater than 19% chance of a given day being a wet day. The month with the most wet days in Yanwan is July, with an average of 11.1 days with at least 0.04 inches of precipitation. The drier season lasts 6.2 months, from October 16 to April 22. The month with the fewest wet days in Yanwan is January, with an average of 0.3 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 Yanwan changes throughout the year. Rain alone is the most common for 8.9 months, from March 4 to November 30. The month with the most days of rain alone in Yanwan is July, with an average of 11.1 days. Snow alone is the most common for 3.1 months, from November 30 to March 4. The month with the most days of snow alone in Yanwan is February, with an average of 0.6 days.
RainfallTo 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. Yanwan experiences extreme seasonal variation in monthly rainfall. The rainy period of the year lasts for 7.7 months, from March 18 to November 9, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Yanwan is August, with an average rainfall of 4.3 inches. The rainless period of the year lasts for 4.3 months, from November 9 to March 18. The month with the least rain in Yanwan is January, with an average rainfall of 0.0 inches.
SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Yanwan experiences some seasonal variation in monthly snowfall. The snowy period of the year lasts for 1.4 months, from February 13 to March 25, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Yanwan is March, with an average snowfall of 1.3 inches. The snowless period of the year lasts for 11 months, from March 25 to February 13. The least snow falls around July 28, with an average total accumulation of 0.0 inches.
SunThe length of the day in Yanwan varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 53 minutes of daylight; the longest day is June 21, with 14 hours, 26 minutes of daylight.
The earliest sunrise is at 5:40 AM on June 12, and the latest sunrise is 2 hours, 18 minutes later at 7:58 AM on January 9. The earliest sunset is at 5:42 PM on December 4, and the latest sunset is 2 hours, 25 minutes later at 8:07 PM on June 29. Daylight saving time (DST) is not observed in Yanwan during 2024. 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. MoonThe 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. HumidityWe 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. Yanwan experiences significant seasonal variation in the perceived humidity. The muggier period of the year lasts for 2.1 months, from June 27 to August 31, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The month with the most muggy days in Yanwan is July, with 8.5 days that are muggy or worse. The least muggy day of the year is February 20, when muggy conditions are essentially unheard of.
WindThis 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 Yanwan experiences mild seasonal variation over the course of the year. The windier part of the year lasts for 3.1 months, from February 19 to May 23, with average wind speeds of more than 6.1 miles per hour. The windiest month of the year in Yanwan is April, with an average hourly wind speed of 7.0 miles per hour. The calmer time of year lasts for 8.9 months, from May 23 to February 19. The calmest month of the year in Yanwan is September, with an average hourly wind speed of 5.3 miles per hour.
The predominant average hourly wind direction in Yanwan is from the south throughout the year. Best Time of Year to VisitTo characterize how pleasant the weather is in Yanwan 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 Yanwan for general outdoor tourist activities is from late June to mid August, with a peak score in the last week of July. Tourism Score in YanwanThe 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 Yanwan for hot-weather activities is from early July to early August, with a peak score in the last week of July. Beach/Pool Score in YanwanMethodologyFor 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. Growing SeasonDefinitions 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 Yanwan typically lasts for 6.5 months (197 days), from around April 11 to around October 26, rarely starting before March 24 or after May 1, and rarely ending before October 9 or after November 11. 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 Yanwan should appear around April 22, only rarely appearing before April 14 or after May 3. Solar EnergyThis 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 4.3 months, from April 10 to August 20, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest month of the year in Yanwan is June, with an average of 6.4 kWh. The darker period of the year lasts for 3.3 months, from October 27 to February 6, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest month of the year in Yanwan is December, with an average of 3.0 kWh.
TopographyFor the purposes of this report, the geographical coordinates of Yanwan are 34.034 deg latitude, 106.978 deg longitude, and 4,770 ft elevation. The topography within 2 miles of Yanwan contains large variations in elevation, with a maximum elevation change of 2,254 feet and an average elevation above sea level of 5,006 feet. Within 10 miles contains large variations in elevation (5,564 feet). Within 50 miles also contains extreme variations in elevation (10,748 feet). The area within 2 miles of Yanwan is covered by grassland (61%), trees (17%), and cropland (14%), within 10 miles by trees (47%) and grassland (38%), and within 50 miles by trees (47%) and grassland (33%). Data SourcesThis report illustrates the typical weather in Yanwan, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere is only a single weather station, Xi'an Xianyang International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Yanwan. At a distance of 170 kilometers from Yanwan, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere . The weight assigned to the MERRA-2 value depends on the distance from Yanwan to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 28%, making the weight assigned to the weather station 72%. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . 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. 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 airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. DisclaimerThe 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. Please review our full terms contained on our Terms of Service page. |