Climate and Average Weather Year Round in Jiulong China

In Jiulong, the summers are short, hot, oppressive, wet, and mostly cloudy and the winters are cold, dry, and mostly clear. Over the course of the year, the temperature typically varies from 40°F to 92°F and is rarely below 35°F or above 100°F.

Based on the tourism score, the best times of year to visit Jiulong for warm-weather activities are from late April to early June and from mid September to late October.

The hot season lasts for 2.8 months, from June 12 to September 6, with an average daily high temperature above 83°F. The hottest month of the year in Jiulong is July, with an average high of 90°F and low of 77°F.

The cool season lasts for 3.3 months, from November 24 to March 2, with an average daily high temperature below 57°F. The coldest month of the year in Jiulong is January, with an average low of 40°F and high of 49°F.

In Jiulong, 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 Jiulong begins around September 21 and lasts for 5.9 months, ending around March 16.

The clearest month of the year in Jiulong is January, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time.

The cloudier part of the year begins around March 16 and lasts for 6.1 months, ending around September 21.

The cloudiest month of the year in Jiulong is July, during which on average the sky is overcast or mostly cloudy 56% of the time.

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

The wetter season lasts 6.5 months, from April 6 to October 24, with a greater than 28% chance of a given day being a wet day. The month with the most wet days in Jiulong is June, with an average of 13.6 days with at least 0.04 inches of precipitation.

The drier season lasts 5.4 months, from October 24 to April 6. The month with the fewest wet days in Jiulong is January, with an average of 1.9 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 Jiulong is June, with an average of 13.6 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 30.

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. Jiulong experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.4 months, from February 23 to December 2, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Jiulong is July, with an average rainfall of 6.0 inches.

The rainless period of the year lasts for 2.7 months, from December 2 to February 23. The month with the least rain in Jiulong is January, with an average rainfall of 0.2 inches.

The length of the day in Jiulong varies significantly over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 10 minutes of daylight; the longest day is June 21, with 14 hours, 7 minutes of daylight.

The earliest sunrise is at 5:51 AM on June 11, and the latest sunrise is 2 hours, 1 minute later at 7:52 AM on January 10. The earliest sunset is at 5:52 PM on December 3, and the latest sunset is 2 hours, 8 minutes later at 8:00 PM on June 30.

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

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.

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.

Jiulong experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.8 months, from May 10 to October 4, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The month with the most muggy days in Jiulong is July, with 30.0 days that are muggy or worse.

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

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

The windier part of the year lasts for 3.3 months, from February 19 to May 27, with average wind speeds of more than 5.8 miles per hour. The windiest month of the year in Jiulong is April, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 8.7 months, from May 27 to February 19. The calmest month of the year in Jiulong is July, with an average hourly wind speed of 5.2 miles per hour.

The predominant average hourly wind direction in Jiulong is from the east throughout the year.

To characterize how pleasant the weather is in Jiulong 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 Jiulong for general outdoor tourist activities are from late April to early June and from mid September to late October, with a peak score in the first week of October.

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 Jiulong for hot-weather activities is from late May to mid September, with a peak score in the second week of June.

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).

Temperatures in Jiulong are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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.

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 4.1 months, from April 18 to August 23, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest month of the year in Jiulong is July, with an average of 5.9 kWh.

The darker period of the year lasts for 3.2 months, from October 29 to February 7, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest month of the year in Jiulong is December, with an average of 2.5 kWh.

For the purposes of this report, the geographical coordinates of Jiulong are 30.536 deg latitude, 106.437 deg longitude, and 1,270 ft elevation.

The topography within 2 miles of Jiulong contains only modest variations in elevation, with a maximum elevation change of 361 feet and an average elevation above sea level of 1,274 feet. Within 10 miles contains only modest variations in elevation (1,568 feet). Within 50 miles contains very significant variations in elevation (4,954 feet).

The area within 2 miles of Jiulong is covered by cropland (75%), within 10 miles by cropland (60%) and shrubs (27%), and within 50 miles by cropland (55%) and shrubs (20%).