Climate and Average Weather Year Round in Thành Phố Lạng Sơn Vietnam

In Thành Phố Lạng Sơn, the wet season is warm, oppressive, and overcast and the dry season is comfortable and mostly clear. Over the course of the year, the temperature typically varies from 51°F to 88°F and is rarely below 43°F or above 93°F.

Based on the tourism score, the best times of year to visit Thành Phố Lạng Sơn for warm-weather activities are from early March to late April and from early October to early December.

The hot season lasts for 5.0 months, from May 3 to October 4, with an average daily high temperature above 83°F. The hottest month of the year in Thành Phố Lạng Sơn is July, with an average high of 87°F and low of 76°F.

The cool season lasts for 2.5 months, from December 13 to February 29, with an average daily high temperature below 68°F. The coldest month of the year in Thành Phố Lạng Sơn is January, with an average low of 52°F and high of 63°F.

In Thành Phố Lạng Sơn, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Thành Phố Lạng Sơn begins around September 29 and lasts for 7.2 months, ending around May 4.

The clearest month of the year in Thành Phố Lạng Sơn is December, during which on average the sky is clear, mostly clear, or partly cloudy 72% of the time.

The cloudier part of the year begins around May 4 and lasts for 4.8 months, ending around September 29.

The cloudiest month of the year in Thành Phố Lạng Sơn is June, during which on average the sky is overcast or mostly cloudy 89% 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 Thành Phố Lạng Sơn varies very significantly throughout the year.

The wetter season lasts 4.8 months, from April 30 to September 23, with a greater than 32% chance of a given day being a wet day. The month with the most wet days in Thành Phố Lạng Sơn is July, with an average of 17.6 days with at least 0.04 inches of precipitation.

The drier season lasts 7.2 months, from September 23 to April 30. The month with the fewest wet days in Thành Phố Lạng Sơn is December, with an average of 2.0 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 Thành Phố Lạng Sơn is July, with an average of 17.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 58% on July 11.

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. Thành Phố Lạng Sơn experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Thành Phố Lạng Sơn. The month with the most rain in Thành Phố Lạng Sơn is July, with an average rainfall of 8.2 inches.

The month with the least rain in Thành Phố Lạng Sơn is February, with an average rainfall of 0.6 inches.

The length of the day in Thành Phố Lạng Sơn varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 48 minutes of daylight; the longest day is June 21, with 13 hours, 28 minutes of daylight.

The earliest sunrise is at 5:09 AM on June 6, and the latest sunrise is 1 hour, 25 minutes later at 6:34 AM on January 16. The earliest sunset is at 5:08 PM on November 27, and the latest sunset is 1 hour, 32 minutes later at 6:40 PM on July 5.

Daylight saving time (DST) is not observed in Thành Phố Lạng Sơn 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.

Thành Phố Lạng Sơn experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.4 months, from March 5 to November 16, during which time the comfort level is muggy, oppressive, or miserable at least 29% of the time. The month with the most muggy days in Thành Phố Lạng Sơn is July, with 31.0 days that are muggy or worse.

The month with the fewest muggy days in Thành Phố Lạng Sơn is January, with 2.0 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 Thành Phố Lạng Sơn experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.5 months, from October 9 to May 23, with average wind speeds of more than 7.5 miles per hour. The windiest month of the year in Thành Phố Lạng Sơn is March, with an average hourly wind speed of 9.1 miles per hour.

The calmer time of year lasts for 4.5 months, from May 23 to October 9. The calmest month of the year in Thành Phố Lạng Sơn is August, with an average hourly wind speed of 5.9 miles per hour.

The predominant average hourly wind direction in Thành Phố Lạng Sơn varies throughout the year.

The wind is most often from the south for 7.3 months, from January 29 to September 9, with a peak percentage of 76% on July 3. The wind is most often from the east for 2.0 days, from September 9 to September 11; for 3.0 weeks, from November 12 to December 3; and for 1.5 months, from December 13 to January 29, with a peak percentage of 39% on November 25. The wind is most often from the north for 2.0 months, from September 11 to November 12 and for 1.4 weeks, from December 3 to December 13, with a peak percentage of 40% on October 19.

Thành Phố Lạng Sơn 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 4.8 months, from May 24 to October 18, with an average temperature above 81°F. The month of the year in Thành Phố Lạng Sơn with the warmest water is August, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.2 months, from December 22 to March 28, with an average temperature below 70°F. The month of the year in Thành Phố Lạng Sơn with the coolest water is February, with an average temperature of 67°F.

To characterize how pleasant the weather is in Thành Phố Lạng Sơn 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 Thành Phố Lạng Sơn for general outdoor tourist activities are from early March to late April and from early October to early December, with a peak score in the second week of November.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Thành Phố Lạng Sơn for hot-weather activities are from mid April to mid May and from mid September to mid October, with a peak score in the last week of September.

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 Thành Phố Lạng Sơn 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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 1.7 months, from March 24 to May 16, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest month of the year in Thành Phố Lạng Sơn is April, with an average of 5.6 kWh.

The darker period of the year lasts for 2.2 months, from November 25 to January 31, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest month of the year in Thành Phố Lạng Sơn is January, with an average of 4.0 kWh.

For the purposes of this report, the geographical coordinates of Thành Phố Lạng Sơn are 21.853 deg latitude, 106.761 deg longitude, and 869 ft elevation.

The topography within 2 miles of Thành Phố Lạng Sơn contains significant variations in elevation, with a maximum elevation change of 531 feet and an average elevation above sea level of 923 feet. Within 10 miles contains significant variations in elevation (3,202 feet). Within 50 miles contains large variations in elevation (4,964 feet).

The area within 2 miles of Thành Phố Lạng Sơn is covered by cropland (50%), trees (22%), grassland (16%), and shrubs (13%), within 10 miles by trees (48%) and shrubs (23%), and within 50 miles by trees (56%) and shrubs (20%).