Average Weather in Ou Chum Cambodia
In Ou Chum, the wet season is oppressive and overcast, the dry season is humid and partly cloudy, and it is hot year round. Over the course of the year, the temperature typically varies from 64°F to 98°F and is rarely below 59°F or above 104°F.
Based on the tourism score, the best time of year to visit Ou Chum for warm-weather activities is from late November to early March.
The hot season lasts for 2.1 months, from March 3 to May 6, with an average daily high temperature above 96°F. The hottest day of the year is March 28, with an average high of 98°F and low of 74°F.
The cool season lasts for 6.9 months, from June 19 to January 16, with an average daily high temperature below 89°F. The coldest day of the year is January 3, with an average low of 64°F and high of 88°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
Ignacio Allende, Mexico (9,948 miles away); Altagracia de Orituco, Venezuela (10,752 miles); and Cuiabá, Brazil (11,313 miles) are the far-away foreign places with temperatures most similar to Ou Chum (view comparison).
In Ou Chum, 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 Ou Chum begins around November 6 and lasts for 5.0 months, ending around April 5. On February 10, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 56% of the time, and overcast or mostly cloudy 44% of the time.
The cloudier part of the year begins around April 5 and lasts for 7.0 months, ending around November 6. On August 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 94% of the time, and clear, mostly clear, or partly cloudy 6% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Ou Chum varies significantly throughout the year.
The wetter season lasts 6.1 months, from May 12 to November 14, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 44% on September 23.
The drier season lasts 5.9 months, from November 14 to May 12. The smallest chance of a wet day is 1% on February 19.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 44% on September 23.
Daily Chance of Precipitation
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. Ou Chum experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.8 months, from April 5 to December 30, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around October 1, with an average total accumulation of 5.6 inches.
The rainless period of the year lasts for 3.2 months, from December 30 to April 5. The least rain falls around February 11, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Ou Chum varies over the course of the year. In 2017, the shortest day is December 21, with 11 hours, 19 minutes of daylight; the longest day is June 21, with 12 hours, 57 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:23 AM on June 2, and the latest sunrise is 57 minutes later at 6:20 AM on January 23. The earliest sunset is at 5:21 PM on November 20, and the latest sunset is 1 hour, 3 minutes later at 6:24 PM on July 9.
Daylight saving time (DST) is not observed in Ou Chum during 2017.
Sunrise & Sunset with Twilight
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.
Ou Chum experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 9.0 months, from March 16 to December 14, during which time the comfort level is muggy, oppressive, or miserable at least 37% of the time. The muggiest day of the year is August 16, with muggy conditions 100% of the time.
The least muggy day of the year is January 25, with muggy conditions 16% of the time.
Humidity Comfort Levels
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 Ou Chum does not vary significantly over the course of the year, remaining within 0.5 miles per hour of 2.4 miles per hour throughout.
Average Wind Speed
The predominant average hourly wind direction in Ou Chum varies throughout the year.
The wind is most often from the south for 2.4 weeks, from May 3 to May 20, with a peak percentage of 42% on May 19. The wind is most often from the west for 4.3 months, from May 20 to September 30, with a peak percentage of 70% on August 7. The wind is most often from the east for 7.1 months, from September 30 to May 3, with a peak percentage of 86% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Ou Chum 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 Ou Chum for general outdoor tourist activities is from late November to early March, with a peak score in the first week of January.
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 Ou Chum for hot-weather activities is from early February to early April, with a peak score in the first week of March.
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 Ou Chum 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.
Time Spent in Various Temperature Bands and 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.
Growing Degree Days
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 2.5 months, from February 1 to April 16, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is March 16, with an average of 6.4 kWh.
The darker period of the year lasts for 4.1 months, from May 31 to October 1, with an average daily incident shortwave energy per square meter below 4.6 kWh. The darkest day of the year is September 6, with an average of 4.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Ou Chum are 13.798 deg latitude, 106.994 deg longitude, and 938 ft elevation.
The topography within 2 miles of Ou Chum contains significant variations in elevation, with a maximum elevation change of 692 feet and an average elevation above sea level of 910 feet. Within 10 miles contains significant variations in elevation (1,355 feet). Within 50 miles contains very significant variations in elevation (4,675 feet).
The area within 2 miles of Ou Chum is covered by cropland (65%) and trees (30%), within 10 miles by trees (69%) and cropland (29%), and within 50 miles by trees (89%).
This report illustrates the typical weather in Ou Chum, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Ou Chum is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Ou Chum, according to the International Standard Atmosphere .
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.