Climate and Average Weather Year Round in Phú Quý Vietnam

In Phú Quý, the wet season is overcast; the dry season is partly cloudy; and it is warm, oppressive, and extremely windy year round. Over the course of the year, the temperature typically varies from 76°F to 84°F and is rarely below 74°F or above 86°F.

Based on the beach/pool score, the best time of year to visit Phú Quý for hot-weather activities is from late December to early April.

The temperature in Phú Quý varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

In Phú Quý, 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 Phú Quý begins around December 3 and lasts for 4.4 months, ending around April 17.

The clearest month of the year in Phú Quý is February, during which on average the sky is clear, mostly clear, or partly cloudy 41% of the time.

The cloudier part of the year begins around April 17 and lasts for 7.6 months, ending around December 3.

The cloudiest month of the year in Phú Quý is June, during which on average the sky is overcast or mostly cloudy 91% 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 Phú Quý varies very significantly throughout the year.

The wetter season lasts 6.5 months, from May 9 to November 23, with a greater than 36% chance of a given day being a wet day. The month with the most wet days in Phú Quý is September, with an average of 19.8 days with at least 0.04 inches of precipitation.

The drier season lasts 5.5 months, from November 23 to May 9. The month with the fewest wet days in Phú Quý is February, with an average of 0.9 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 Phú Quý is September, with an average of 19.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 70% on September 23.

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. Phú Quý experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from March 10 to January 19, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Phú Quý is September, with an average rainfall of 8.8 inches.

The rainless period of the year lasts for 1.7 months, from January 19 to March 10. The month with the least rain in Phú Quý is February, with an average rainfall of 0.2 inches.

The length of the day in Phú Quý does not vary substantially over the course of the year, staying within 44 minutes of 12 hours throughout. In 2024, the shortest day is December 21, with 11 hours, 31 minutes of daylight; the longest day is June 21, with 12 hours, 44 minutes of daylight.

The earliest sunrise is at 5:21 AM on May 29, and the latest sunrise is 46 minutes later at 6:07 AM on January 27. The earliest sunset is at 5:18 PM on November 16, and the latest sunset is 53 minutes later at 6:10 PM on July 10.

Daylight saving time (DST) is not observed in Phú Quý 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.

The perceived humidity level in Phú Quý, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 1% of 99% throughout.

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 Phú Quý experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 3.9 months, from November 4 to March 1, with average wind speeds of more than 17.6 miles per hour. The windiest month of the year in Phú Quý is December, with an average hourly wind speed of 24.1 miles per hour.

The calmer time of year lasts for 8.1 months, from March 1 to November 4. The calmest month of the year in Phú Quý is April, with an average hourly wind speed of 11.6 miles per hour.

The predominant average hourly wind direction in Phú Quý varies throughout the year.

The wind is most often from the east for 3.1 months, from February 10 to May 13 and for 3.7 weeks, from October 8 to November 3, with a peak percentage of 75% on March 24. The wind is most often from the west for 4.8 months, from May 13 to October 8, with a peak percentage of 88% on August 8. The wind is most often from the north for 3.2 months, from November 3 to February 10, with a peak percentage of 81% on January 1.

Phú Quý 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 3.1 months, from April 20 to July 22, with an average temperature above 83°F. The month of the year in Phú Quý with the warmest water is May, with an average temperature of 84°F.

The time of year with cooler water lasts for 2.5 months, from December 15 to February 29, with an average temperature below 78°F. The month of the year in Phú Quý with the coolest water is January, with an average temperature of 77°F.

To characterize how pleasant the weather is in Phú Quý 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 Phú Quý for general outdoor tourist activities is from late December to early March, with a peak score in the second week of February.

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 Phú Quý for hot-weather activities is from late December to early April, with a peak score in the last week of February.

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 Phú Quý 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 2.6 months, from February 4 to April 22, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year in Phú Quý is March, with an average of 6.4 kWh.

The darker period of the year lasts for 5.5 months, from May 17 to November 2, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest month of the year in Phú Quý is June, with an average of 3.8 kWh.

For the purposes of this report, the geographical coordinates of Phú Quý are 10.517 deg latitude, 108.933 deg longitude, and 20 ft elevation.

The topography within 2 miles of Phú Quý contains only modest variations in elevation, with a maximum elevation change of 322 feet and an average elevation above sea level of 26 feet. Within 10 miles also contains only modest variations in elevation (322 feet). Within 50 miles also contains only modest variations in elevation (364 feet).

The area within 2 miles of Phú Quý is covered by water (66%) and cropland (24%), within 10 miles by water (98%), and within 50 miles by water (100%).