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Average Weather in Xi’an China

In Xi’an, the summers are hot, muggy, wet, and partly cloudy and the winters are very cold, dry, and mostly clear. Over the course of the year, the temperature typically varies from 25°F to 89°F and is rarely below 17°F or above 98°F.

Climate Summary

very coldcoldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec72%72%48%48%clearovercastprecipitation: 4.1 inprecipitation: 4.1 in0.1 in0.1 inmuggy: 88%muggy: 88%0%0%drydrytourism score: 6.7tourism score: 6.70.00.0
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Xi’an for warm-weather activities are from early May to late June and from mid August to early October.

Temperature

The hot season lasts for 3.7 months, from May 19 to September 9, with an average daily high temperature above 79°F. The hottest day of the year is July 21, with an average high of 89°F and low of 74°F.

The cold season lasts for 3.0 months, from November 24 to February 24, with an average daily high temperature below 51°F. The coldest day of the year is January 10, with an average low of 25°F and high of 41°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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.

Average Hourly Temperature

Average Hourly Temperature in Xi’anJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingvery coldvery coldcoldcoldcoolcoolwarmwarmhotcomfortablefreezing
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Hazelwood, Missouri, United States (7,250 miles away) is the far-away foreign place with temperatures most similar to Xi’an (view comparison).

Clouds

In Xi’an, 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 Xi’an begins around October 16 and lasts for 3.7 months, ending around February 7. On December 16, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 28% of the time.

The cloudier part of the year begins around February 7 and lasts for 8.3 months, ending around October 16. On March 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 52% of the time, and clear, mostly clear, or partly cloudy 48% of the time.

Cloud Cover Categories

Cloud Cover Categories in Xi’anclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Dec 1672%Dec 1672%Mar 2748%Mar 2748%Oct 1660%Oct 1660%Feb 760%Feb 760%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 6.4 months, from April 15 to October 27, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 35% on July 8.

The drier season lasts 5.6 months, from October 27 to April 15. The smallest chance of a wet day is 1% on January 8.

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 throughout the year is rain alone, with a peak probability of 35% on July 8.

Daily Chance of Precipitation

Daily Chance of Precipitation in Xi’anwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 835%Jul 835%Jan 81%Jan 81%Jan 12%Jan 12%Apr 1518%Apr 1518%Oct 2718%Oct 2718%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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. Xi’an experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.5 months, from March 5 to November 20, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 12, with an average total accumulation of 4.1 inches.

The rainless period of the year lasts for 3.5 months, from November 20 to March 5. The least rain falls around January 13, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Xi’an varies significantly over the course of the year. In 2018, the shortest day is December 22, with 9 hours, 52 minutes of daylight; the longest day is June 21, with 14 hours, 27 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:31 AM on June 13, and the latest sunrise is 2 hours, 19 minutes later at 7:51 AM on January 7. The earliest sunset is at 5:34 PM on December 5, and the latest sunset is 2 hours, 26 minutes later at 8:00 PM on June 29.

Daylight saving time (DST) is not observed in Xi’an during 2018.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in Xi’anJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:31 AMJun 135:31 AM8:00 PMJun 298:00 PMJun 29Dec 55:34 PMDec 55:34 PM7:51 AMJan 77:51 AMJan 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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.

Xi’an experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.0 months, from June 13 to September 14, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is July 30, with muggy conditions 88% of the time.

The least muggy day of the year is November 29, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in Xi’anmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 290%Nov 290%88%Jul 3088%Jul 30Jun 1322%Jun 1322%Sep 1422%Sep 1422%muggymuggydrydryoppressiveoppressivehumidhumidmiserablemiserablecomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Xi’an experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.8 months, from February 23 to June 18, with average wind speeds of more than 5.3 miles per hour. The windiest day of the year is April 25, with an average hourly wind speed of 6.3 miles per hour.

The calmer time of year lasts for 8.2 months, from June 18 to February 23. The calmest day of the year is January 10, with an average hourly wind speed of 4.4 miles per hour.

Average Wind Speed

Average Wind Speed in Xi’anwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphApr 256.3 mphApr 256.3 mphJan 104.4 mphJan 104.4 mphFeb 235.3 mphFeb 235.3 mphJun 185.3 mphJun 185.3 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Xi’an varies throughout the year.

The wind is most often from the east for 2.4 months, from January 5 to March 18 and for 2.3 months, from August 10 to October 20, with a peak percentage of 37% on August 17. The wind is most often from the south for 4.7 months, from March 18 to August 10 and for 3.0 days, from October 20 to October 23, with a peak percentage of 41% on July 12. The wind is most often from the west for 2.4 months, from October 23 to January 5, with a peak percentage of 31% on January 1.

Wind Direction

Wind Direction in Xi’anESEWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in Xi’an 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 times of year to visit Xi’an for general outdoor tourist activities are from early May to late June and from mid August to early October, with a peak score in the second week of September.

Tourism Score

Tourism Score in Xi’anbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.76.70.00.06.66.65.45.4precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Xi’an for hot-weather activities is from mid June to late August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score in Xi’anbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.56.50.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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.

Growing Season

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 Xi’an typically lasts for 8.4 months (256 days), from around March 8 to around November 19, rarely starting before February 16 or after March 27, and rarely ending before October 30 or after December 8.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Xi’angrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 850%Mar 850%Nov 1950%Nov 1990%Mar 2790%Mar 2790%Oct 3090%Oct 3010%Feb 1610%Feb 1610%Dec 810%Dec 8Jul 10100%Jul 10100%freezingvery coldcomfortablewarmhotcoolcold
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

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 Xi’an should appear around March 25, only rarely appearing before March 15 or after April 4.

Growing Degree Days

Growing Degree Days in Xi’anJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°F4,500°FMar 2588°FMar 2588°FMay 25900°FMay 25900°FJun 301,800°FJun 301,800°FDec 314,511°FDec 314,511°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 4.2 months, from April 15 to August 21, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is June 11, with an average of 6.4 kWh.

The darker period of the year lasts for 3.3 months, from October 30 to February 8, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 24, with an average of 2.8 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Xi’an are 34.258 deg latitude, 108.929 deg longitude, and 1,342 ft elevation.

The topography within 2 miles of Xi’an contains only modest variations in elevation, with a maximum elevation change of 141 feet and an average elevation above sea level of 1,340 feet. Within 10 miles contains only modest variations in elevation (1,227 feet). Within 50 miles contains very significant variations in elevation (8,757 feet).

The area within 2 miles of Xi’an is covered by artificial surfaces (100%), within 10 miles by cropland (50%) and artificial surfaces (38%), and within 50 miles by cropland (44%) and trees (23%).

Data Sources

This report illustrates the typical weather in Xi’an, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There 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 Xi’an.

At a distance of 27 kilometers from Xi’an, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Xi’an according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

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.

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 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.

Disclaimer

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.