September Weather in Yanjiang China

Daily high temperatures decrease by 8°F, from 84°F to 75°F, rarely falling below 68°F or exceeding 93°F.

Daily low temperatures decrease by 6°F, from 69°F to 63°F, rarely falling below 59°F or exceeding 74°F.

For reference, on August 1, the hottest day of the year, temperatures in Yanjiang typically range from 73°F to 88°F, while on January 14, the coldest day of the year, they range from 37°F to 50°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

College Park, United States (7,999 miles away) and Belhaven, United States (7,908 miles) are the far-away foreign places with temperatures most similar to Yanjiang (view comparison).

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The month of September in Yanjiang experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 55% to 42%.

The clearest day of the month is September 28, with clear, mostly clear, or partly cloudy conditions 58% of the time.

For reference, on July 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on January 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Yanjiang, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 51% and ending it at 36%.

For reference, the year's highest daily chance of a wet day is 56% on July 13, and its lowest chance is 3% on December 31.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September in Yanjiang is very rapidly decreasing, starting the month at 5.4 inches, when it rarely exceeds 8.1 inches or falls below 2.8 inches, and ending the month at 2.3 inches, when it rarely exceeds 3.5 inches or falls below 1.3 inches.

Over the course of September in Yanjiang, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 52 minutes, implying an average daily decrease of 1 minute, 47 seconds, and weekly decrease of 12 minutes, 31 seconds.

The shortest day of the month is September 30, with 11 hours, 54 minutes of daylight and the longest day is September 1, with 12 hours, 46 minutes of daylight.

The earliest sunrise of the month in Yanjiang is 6:38 AM on September 1 and the latest sunrise is 16 minutes later at 6:54 AM on September 30.

The latest sunset is 7:23 PM on September 1 and the earliest sunset is 36 minutes earlier at 6:47 PM on September 30.

Daylight saving time is not observed in Yanjiang during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 6:00 AM and sets 14 hours, 5 minutes later, at 8:05 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 10 hours, 12 minutes later, at 6:05 PM.

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.

The figure below presents a compact representation of key lunar data for September 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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.

The chance that a given day will be muggy in Yanjiang is very rapidly decreasing during September, falling from 83% to 33% over the course of the month.

For reference, on July 26, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Yanjiang is essentially constant during September, remaining within 0.1 miles per hour of 5.5 miles per hour throughout.

For reference, on March 28, the windiest day of the year, the daily average wind speed is 6.7 miles per hour, while on July 28, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.

The hourly average wind direction in Yanjiang throughout September is predominantly from the north, with a peak proportion of 43% on September 19.

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 Yanjiang typically lasts for 11 months (325 days), from around January 29 to around December 19, rarely starting after February 23, or ending before November 30.

The month of September in Yanjiang is reliably fully 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.

The average accumulated growing degree days in Yanjiang are rapidly increasing during September, increasing by 644°F, from 3,931°F to 4,576°F, over the course of the month.

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 in Yanjiang is gradually decreasing during September, falling by 0.8 kWh, from 5.2 kWh to 4.3 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Yanjiang are 30.121 deg latitude, 104.648 deg longitude, and 1,198 ft elevation.

The topography within 2 miles of Yanjiang contains only modest variations in elevation, with a maximum elevation change of 338 feet and an average elevation above sea level of 1,226 feet. Within 10 miles contains only modest variations in elevation (551 feet). Within 50 miles contains significant variations in elevation (2,585 feet).

The area within 2 miles of Yanjiang is covered by artificial surfaces (44%), cropland (32%), and water (14%), within 10 miles by cropland (70%), and within 50 miles by cropland (70%) and shrubs (13%).