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Climate and Average Weather Year Round in Xihu China

In Xihu, the summers are short, hot, oppressive, wet, and mostly cloudy and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 33°F to 93°F and is rarely below 26°F or above 99°F.

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

Climate in Xihu

coldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow72%72%22%22%clearovercastprecipitation: 8.0 inprecipitation: 8.0 in1.5 in1.5 inmuggy: 99%muggy: 99%0%0%drydrytourism score: 7.2tourism score: 7.20.20.2
Xihu weather by month. Click on each chart for more information.

The hot season lasts for 2.9 months, from June 13 to September 9, with an average daily high temperature above 83°F. The hottest month of the year in Xihu is July, with an average high of 91°F and low of 78°F.

The cool season lasts for 3.1 months, from December 2 to March 5, with an average daily high temperature below 55°F. The coldest month of the year in Xihu is January, with an average low of 34°F and high of 46°F.

Average High and Low Temperature in Xihu

Average High and Low Temperature in XihuhotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°F110°F110°FJan 1945°FJan 1945°FJul 2393°FJul 2393°F33°F33°F79°F79°FJun 1383°FJun 1383°FSep 983°FSep 983°FDec 255°FDec 255°FMar 555°FMar 555°F71°F71°F71°F71°F40°F40°F41°F41°FNowNow
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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 46°F50°F58°F70°F79°F84°F91°F90°F81°F73°F62°F51°F
Temp. 39°F43°F51°F62°F71°F77°F84°F82°F75°F65°F54°F43°F
Low 34°F37°F45°F55°F64°F72°F78°F76°F68°F58°F47°F37°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.

Average Hourly Temperature in Xihu

Average Hourly Temperature in XihuJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowvery coldcoldcoldcoolcoolwarmhotvery coldcomfortablecoldvery coldcomfortable
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Memphis, Tennessee, United States (7,519 miles away) and Tehran, Iran (3,923 miles) are the far-away foreign places with temperatures most similar to Xihu (view comparison).

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© OpenStreetMap contributors

Compare Xihu to another city:

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In Xihu, 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 Xihu begins around September 1 and lasts for 6.3 months, ending around March 11.

The clearest month of the year in Xihu is October, 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 March 11 and lasts for 5.7 months, ending around September 1.

The cloudiest month of the year in Xihu is July, during which on average the sky is overcast or mostly cloudy 70% of the time.

Cloud Cover Categories in Xihu

Cloud Cover Categories in XihuclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2272%Oct 2272%Jul 322%Jul 322%Sep 147%Sep 147%Mar 1147%Mar 1147%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 38%44%55%59%57%68%70%58%42%30%32%31%
Clearer 62%56%45%41%43%32%30%42%58%70%68%69%

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

The wetter season lasts 6.7 months, from February 19 to September 10, with a greater than 32% chance of a given day being a wet day. The month with the most wet days in Xihu is June, with an average of 13.4 days with at least 0.04 inches of precipitation.

The drier season lasts 5.3 months, from September 10 to February 19. The month with the fewest wet days in Xihu is December, with an average of 5.2 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 Xihu is June, with an average of 13.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on June 21.

Daily Chance of Precipitation in Xihu

Daily Chance of Precipitation in XihuwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 2150%Jun 2150%Dec 1715%Dec 1715%Feb 1932%Feb 1932%Sep 1032%Sep 1032%NowNowrainmixed
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 5.7d7.7d11.8d10.7d10.5d13.4d11.7d12.0d8.8d5.9d6.0d4.9d
Mixed 0.9d0.8d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.3d
Snow 0.2d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d
Any 6.8d8.7d12.0d10.8d10.5d13.4d11.7d12.0d8.8d5.9d6.0d5.2d

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. Xihu experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Xihu. The month with the most rain in Xihu is June, with an average rainfall of 7.7 inches.

The month with the least rain in Xihu is December, with an average rainfall of 1.4 inches.

Average Monthly Rainfall in Xihu

Average Monthly Rainfall in XihuJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inJun 238.0 inJun 238.0 inDec 211.4 inDec 211.4 inAug 195.3 inAug 195.3 inMar 234.2 inMar 234.2 inNowNow
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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 1.8″2.7″4.1″4.1″4.6″7.7″5.6″5.3″4.2″2.5″2.1″1.4″

Snowfall

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

The snowy period of the year lasts for 1.8 months, from December 28 to February 20, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Xihu is January, with an average snowfall of 1.8 inches.

The snowless period of the year lasts for 10 months, from February 20 to December 28. The least snow falls around July 19, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Xihu

Average Monthly Snowfall in XihusnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inJan 221.9 inJan 221.9 inJul 190.0 inJul 190.0 inDec 281.0 inDec 281.0 in
The average snowfall (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 rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 1.8″1.2″0.3″0.0″0.0″0.0″0.0″0.0″0.0″0.0″0.1″0.6″

The length of the day in Xihu varies significantly over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 12 minutes of daylight; the longest day is June 21, with 14 hours, 6 minutes of daylight.

Hours of Daylight and Twilight in Xihu

Hours of Daylight and Twilight in XihuJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 6 minJun 2114 hr, 6 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 12 minDec 2110 hr, 12 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 10.4h11.1h12.0h12.9h13.7h14.1h13.9h13.2h12.3h11.4h10.6h10.2h

The earliest sunrise is at 4:57 AM on June 11, and the latest sunrise is 2 hours, 0 minutes later at 6:57 AM on January 11. The earliest sunset is at 4:58 PM on December 2, and the latest sunset is 2 hours, 7 minutes later at 7:05 PM on June 30.

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

Sunrise & Sunset with Twilight in Xihu

Sunrise & Sunset with Twilight in XihuJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 114:57 AMJun 114:57 AM7:05 PMJun 307:05 PMJun 30Dec 24:58 PMDec 24:58 PM6:57 AMJan 116:57 AMJan 11daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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.

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.

Solar Elevation and Azimuth in Xihu

Solar Elevation and Azimuth in XihuJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM000010101010202020203030303040404050505060607080000010101010202020203030303040404040505050606070708036NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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.

Moon Rise, Set & Phases in Xihu

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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.

Xihu experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.8 months, from May 11 to October 5, 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 Xihu is July, with 30.6 days that are muggy or worse.

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

Humidity Comfort Levels in Xihu

Humidity Comfort Levels in XihumuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 260%Jan 260%99%Jul 2499%Jul 24May 1125%May 1125%Oct 525%Oct 525%NowNowmiserablemiserableoppressiveoppressivedrydrymuggymuggyhumidhumidcomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.1d1.9d9.6d23.3d30.6d29.8d18.0d4.3d0.5d0.0d

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 Xihu experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.5 months, from January 31 to May 14, with average wind speeds of more than 7.4 miles per hour. The windiest month of the year in Xihu is March, with an average hourly wind speed of 7.9 miles per hour.

The calmer time of year lasts for 8.5 months, from May 14 to January 31. The calmest month of the year in Xihu is June, with an average hourly wind speed of 6.8 miles per hour.

Average Wind Speed in Xihu

Average Wind Speed in XihuwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphMar 98.0 mphMar 98.0 mphJun 236.7 mphJun 236.7 mphJan 317.4 mphJan 317.4 mphMay 147.4 mphMay 147.4 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 7.27.77.97.77.36.86.96.97.27.07.07.1

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

The wind is most often from the east for 1.0 months, from March 12 to April 12; for 3.9 weeks, from May 19 to June 15; and for 2.0 months, from August 10 to October 11, with a peak percentage of 42% on September 26. The wind is most often from the south for 1.2 months, from April 12 to May 19 and for 1.8 months, from June 15 to August 10, with a peak percentage of 48% on July 13. The wind is most often from the north for 5.0 months, from October 11 to March 12, with a peak percentage of 47% on January 1.

Wind Direction in Xihu

Wind Direction in XihuNESESENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowsoutheastnorthwest
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Xihu is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 22 to September 30, with an average temperature above 75°F. The month of the year in Xihu with the warmest water is August, with an average temperature of 82°F.

The time of year with cooler water lasts for 3.4 months, from December 23 to April 4, with an average temperature below 52°F. The month of the year in Xihu with the coolest water is February, with an average temperature of 45°F.

Average Water Temperature in Xihu

Average Water Temperature in XihuwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°FAug 682°FAug 682°F45°FFeb 945°FFeb 9Jun 2275°FJun 2275°FSep 3075°FSep 3075°FDec 2352°FDec 2352°FApr 452°FApr 452°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 47°F45°F49°F56°F65°F74°F80°F82°F78°F71°F63°F55°F

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

Tourism Score in Xihu

Tourism Score in XihuJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.27.20.20.26.26.23.43.4NowNowtemperaturetemperaturecloudscloudsprecipitationprecipitationtourism 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 Xihu for hot-weather activities is from late July to mid September, with a peak score in the last week of August.

Beach/Pool Score in Xihu

Beach/Pool Score in Xihubest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.75.70.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/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.

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 Xihu typically lasts for 9.2 months (279 days), from around February 26 to around December 1, rarely starting before February 5 or after March 16, and rarely ending before November 12 or after December 21.

Time Spent in Various Temperature Bands and the Growing Season in Xihu

Time Spent in Various Temperature Bands and the Growing Season in Xihugrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2650%Feb 2650%Dec 150%Dec 190%Mar 1690%Mar 1690%Nov 1290%Nov 1210%Feb 510%Feb 510%Dec 2110%Dec 210%Jan 130%Jan 13Jul 16100%Jul 16100%NowNowvery coldcoldcoolwarmhotcomfortable
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 percentage of time spent in various temperature bands. 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 Xihu should appear around March 10, only rarely appearing before February 23 or after March 29.

Growing Degree Days in Xihu

Growing Degree Days in XihuJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FMar 1080°FMar 1080°FMay 19900°FMay 19900°FJun 241,800°FJun 241,800°FDec 315,335°FDec 315,335°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 1.8 months, from April 24 to June 18, with an average daily incident shortwave energy per square meter above 5.2 kWh. The brightest month of the year in Xihu is May, with an average of 5.6 kWh.

The darker period of the year lasts for 3.0 months, from November 9 to February 10, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest month of the year in Xihu is December, with an average of 3.0 kWh.

Average Daily Incident Shortwave Solar Energy in Xihu

Average Daily Incident Shortwave Solar Energy in XihubrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhMay 215.8 kWhMay 215.8 kWhJan 32.9 kWhJan 32.9 kWhNov 93.5 kWhNov 93.5 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 3.13.64.15.05.65.35.35.35.04.33.33.0

For the purposes of this report, the geographical coordinates of Xihu are 30.242 deg latitude, 120.119 deg longitude, and 52 ft elevation.

The topography within 2 miles of Xihu contains very significant variations in elevation, with a maximum elevation change of 1,066 feet and an average elevation above sea level of 225 feet. Within 10 miles also contains very significant variations in elevation (1,765 feet). Within 50 miles contains very significant variations in elevation (5,354 feet).

The area within 2 miles of Xihu is covered by trees (69%), water (14%), and artificial surfaces (10%), within 10 miles by cropland (38%) and artificial surfaces (26%), and within 50 miles by trees (46%) and cropland (33%).

This report illustrates the typical weather in Xihu, 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, Hangzhou Xiaoshan International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Xihu.

At a distance of 30 kilometers from Xihu, 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 Xihu 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 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.

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.

Please review our full terms contained on our Terms of Service page.