Climate and Average Weather Year Round in Pa Sang Thailand

In Pa Sang, the wet season is oppressive and overcast, the dry season is mostly clear, and it is hot year round. Over the course of the year, the temperature typically varies from 59°F to 98°F and is rarely below 53°F or above 103°F.

Based on the tourism score, the best time of year to visit Pa Sang for warm-weather activities is from mid November to early March.

The hot season lasts for 1.9 months, from March 8 to May 5, with an average daily high temperature above 95°F. The hottest month of the year in Pa Sang is April, with an average high of 97°F and low of 75°F.

The cool season lasts for 2.2 months, from November 13 to January 21, with an average daily high temperature below 86°F. The coldest month of the year in Pa Sang is January, with an average low of 59°F and high of 86°F.

In Pa Sang, 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 Pa Sang begins around October 27 and lasts for 5.7 months, ending around April 16.

The clearest month of the year in Pa Sang is February, during which on average the sky is clear, mostly clear, or partly cloudy 74% of the time.

The cloudier part of the year begins around April 16 and lasts for 6.3 months, ending around October 27.

The cloudiest month of the year in Pa Sang is July, during which on average the sky is overcast or mostly cloudy 92% 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 Pa Sang varies very significantly throughout the year.

The wetter season lasts 5.9 months, from April 24 to October 19, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Pa Sang is August, with an average of 17.2 days with at least 0.04 inches of precipitation.

The drier season lasts 6.1 months, from October 19 to April 24. The month with the fewest wet days in Pa Sang is January, with an average of 0.5 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 Pa Sang is August, with an average of 17.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 59% on September 2.

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. Pa Sang experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.9 months, from March 7 to December 4, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Pa Sang is September, with an average rainfall of 6.9 inches.

The rainless period of the year lasts for 3.1 months, from December 4 to March 7. The month with the least rain in Pa Sang is January, with an average rainfall of 0.2 inches.

The length of the day in Pa Sang varies over the course of the year. In 2024, the shortest day is December 21, with 11 hours, 1 minute of daylight; the longest day is June 21, with 13 hours, 15 minutes of daylight.

The earliest sunrise is at 5:46 AM on June 4, and the latest sunrise is 1 hour, 13 minutes later at 6:59 AM on January 20. The earliest sunset is at 5:45 PM on November 24, and the latest sunset is 1 hour, 19 minutes later at 7:05 PM on July 6.

Daylight saving time (DST) is not observed in Pa Sang 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.

Pa Sang experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.5 months, from March 26 to December 9, 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 Pa Sang is August, with 30.6 days that are muggy or worse.

The month with the fewest muggy days in Pa Sang is January, with 1.9 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 Pa Sang does not vary significantly over the course of the year, remaining within 0.5 miles per hour of 2.9 miles per hour throughout.

The predominant average hourly wind direction in Pa Sang varies throughout the year.

The wind is most often from the south for 5.0 days, from January 14 to January 19; for 3.9 weeks, from May 17 to June 13; and for 6.0 days, from September 15 to September 21, with a peak percentage of 51% on June 6. The wind is most often from the west for 3.9 months, from January 19 to May 17 and for 3.1 months, from June 13 to September 15, with a peak percentage of 58% on July 7. The wind is most often from the east for 3.8 months, from September 21 to January 14, with a peak percentage of 40% on January 1.

To characterize how pleasant the weather is in Pa Sang 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 time of year to visit Pa Sang for general outdoor tourist activities is from mid November to early March, with a peak score in the third week of December.

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 Pa Sang for hot-weather activities is from late February to early April, with a peak score in the third week of March.

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 Pa Sang 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 2.0 months, from February 19 to April 21, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest month of the year in Pa Sang is March, with an average of 6.3 kWh.

The darker period of the year lasts for 2.6 months, from July 5 to September 24, with an average daily incident shortwave energy per square meter below 4.9 kWh. The darkest month of the year in Pa Sang is August, with an average of 4.6 kWh.

For the purposes of this report, the geographical coordinates of Pa Sang are 18.526 deg latitude, 98.939 deg longitude, and 968 ft elevation.

The topography within 2 miles of Pa Sang is essentially flat, with a maximum elevation change of 72 feet and an average elevation above sea level of 958 feet. Within 10 miles is essentially flat (1,175 feet). Within 50 miles contains very significant variations in elevation (7,805 feet).

The area within 2 miles of Pa Sang is covered by cropland (98%), within 10 miles by cropland (73%) and trees (12%), and within 50 miles by trees (75%) and cropland (19%).