This report describes the typical weather at the Hangzhou Xiaoshan International Airport (Hangzhou, China) weather station over the course of an average September 7. It is based on the historical records from 1988 to 2012. Earlier records are either unavailable or unreliable.
Hangzhou has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (76%), grasslands (9%), oceans and seas (6%), shrublands (6%), and lakes and rivers (2%).
The temperature typically varies from 74°F to 84°F and is rarely below 68°F or above 92°F.
The coolest hours of the day are from 1am to 8am with the coldest at 6am, at which time the temperature is below 77°F three days out of four.
The warmest hours of the day are from 11am to 5pm with the hottest at 2pm, at which time the temperature is above 80°F three days out of four.
The day has gained half its heat by 10am and lost it again by 7pm.
On September 7 the Sun rises at 5:39am and sets at 6:14pm.
Solar noon is at 11:57am.
For reference, on the longest day of the year the Sun rises at 4:57am and sets at 7:04pm, while on the shortest day of the year it rises at 6:51am and sets at 5:03pm.
Astronomical twilight begins and ends 81 minutes before sunrise and after sunset at 4:17am and 7:36pm, respectively.
Nautical twilight begins and ends 52 minutes before sunrise and after sunset at 4:47am and 7:07pm, respectively.
Civil twilight begins and ends 23 minutes before sunrise and after sunset at 5:15am and 6:38pm, respectively.
Solar twilight begins and ends 31 minutes after sunrise and before sunset at 6:11am and 5:43pm, respectively.
The median cloud cover is 79% (partly cloudy) and does not vary substantially over the course of the day.
On average, the sky is clear or mostly clear 23% of the time, partly cloudy 19% of the time, and mostly cloudy or overcast 48% of the time.
There is a 54% chance that precipitation will be observed at some point during the day.
When precipitation does occur it is most often in the form of moderate rain (38% of days with precipitation have at worst moderate rain), slight rain (32%), and thunderstorms (27%).
Precipitation is most likely around 5pm and least likely around 3am.
Either snow is exceptionally unlikely to fall at this location on September 7 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 64% (mildly humid) to 89% (very humid), rarely dropping below 47% (comfortable), or exceeding 99% (very humid).
The air is driest at 2pm, at which time the relative humidity is less than 74% (humid) three days out of four; it is most humid at 5am, exceeding 83% (humid) three days out of four.
The dew point ranges from 69°F to 71°F with an average of 71°F, which feels muggy no matter what the relative humidity is.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
Sustained wind speeds typically vary from 3 mph to 8 mph (light air to light breeze) over the course of the day.
The peak sustained wind speed typically occurs around 4pm and is rarely outside the range 3 mph to 12 mph (light breeze to gentle breeze).
The wind is most calm around 2am, rarely exceeding 6 mph (light breeze).
The wind is most often out of the east (19% of the time) and north (18% of the time). The wind is least often out of the south west (3% of the time) and south east (4% of the time).