This report describes the historical weather record at the Shanghai Pudong International Airport (Shanghai, China) during the last 12 months. This station has records back to July 2004.
Shanghai has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (52%), croplands (41%), built-up areas (3%), and shrublands (3%)
Daylight saving time (DST) was not observed at Shanghai during the last 12 months.
2013 is not a leap year, so it has 365 days and no February 29th. The first leap year before 2013 was 2012 and the first after will be 2016.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 2013 they occurred on:
|Spring Equinox||Wednesday, 20 March 2013.|
|Summer Solstice||Friday, 21 June 2013.|
|Fall Equinox||Sunday, 22 September 2013.|
|Winter Solstice||Saturday, 21 December 2013.|
The hottest day of the last 12 months was August 8, with a high temperature of 106°F. For reference, on that day the average high temperature is 90°F and the high temperature exceeds 94°F only one day in ten. The hottest month of the last 12 months was July with an average daily high temperature of 95°F.
Relative to the average, the hottest day was March 9. The high temperature that day was 84°F, compared to the average of 54°F, a difference of 30°F. In relative terms the warmest month was December, with an average high temperature of 58°F, compared to an typical value of 51°F.
The longest warm spell was from July 14 to August 18, constituting 36 consecutive days with warmer than average high temperatures. The month of July had the largest fraction of warmer than average days with 94% days with higher than average high temperatures.
The coldest day of the last 12 months was December 24, with a low temperature of 25°F. For reference, on that day the average low temperature is 37°F and the low temperature drops below 29°F only one day in ten. The coldest month of the last 12 months was January with an average daily low temperature of 33°F.
Relative to the average, the coldest day was November 30. The low temperature that day was 32°F, compared to the average of 44°F, a difference of 12°F. In relative terms the coldest month was April, with an average low temperature of 50°F, compared to an typical value of 52°F.
The longest cold spell was from December 3 to December 14, constituting 12 consecutive days with cooler than average low temperatures. The month of January had the largest fraction of cooler than average days with 74% days with lower than average low temperatures.
The clearest month of the last 12 months was December, with 16% of days being more clear than cloudy.
The cloudiest month of the last 12 months was June, with 67% of days being more cloudy than clear. The longest spell of cloudy weather was from June 4 to June 11, constituting 8 consecutive days that were cloudier than they were clear.
This station provides hourly reports of significant weather events at and around the station, but does not report the quantity of precipitation at the station itself. This is common for weather stations located outside of the United States, and for a small subset of stations in the United States that are located at lesser used and smaller airports.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in the last 12 months with the most precipitation observations was February 18. There were 24 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was June, with 188 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from October 10 to October 30, constituting 21 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was November, with 83% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was February, with 68% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of the last 12 months with the largest number of those reports was June, with a total of 188 reports. The day with the largest number of those reports was February 18, with a total of 24 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in the last 12 months was on December 23; the last was on February 19. The month of the last 12 months with the largest number of those reports was January, with a total of 27 reports. The day with the largest number of those reports was February 7, with a total of 10 reports.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of the last 12 months was November with an average daily low humidity of 43%, and the most humid month was June with an average daily low humidity of 73%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50°F to 68°F are fairly comfortable to most people, and dew points above 68°F are increasingly uncomfortable, becoming oppressive around 77°F.
To take some examples, and basing our categorization on the daily high dew point in the last 12 months, January had 28 dry days, 3 comfortable days, and no humid days; April had 9 dry days, 21 comfortable days, and no humid days; July had no dry days, no comfortable days, and 31 humid days; and October had 3 dry days, 20 comfortable days, and 8 humid days.
The highest sustained wind speed was 40 mph, occurring on June 7; the highest daily mean wind speed was 25 mph (June 7); and the highest wind gust speed was 54 mph (June 7).
The windiest month was October, with an average wind speed of 13 mph. The least windy month was December, with an average wind speed of 6 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of the last 12 months with the lowest average visibility was January 21, with an average visibility of 1.3 mi. The month with the lowest average visibility was December, with an average visibility of 2.2 mi. With an average visibility of 6.0 mi, the month of August had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of the last 12 months with the lowest average cloud ceiling was May 15, with an average cloud ceiling of 162'. The month with the lowest average cloud ceiling was June, with an average cloud ceiling of 994'. The month of October has the highest average cloud ceiling, with an average cloud ceiling of 2719'.