Average Weather at Aeropuerto Internacional La Unión Dominican Republic

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2. Dominican Republic
3. Puerto Plata
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5. Aeropuerto Internacional La Unión

The climate at Aeropuerto Internacional La Unión is hot, oppressive, and partly cloudy. Over the course of the year, the temperature typically varies from 69°F to 89°F and is rarely below 66°F or above 92°F.

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.

At Aeropuerto Internacional La Unión, 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 at Aeropuerto Internacional La Unión begins around November 15 and lasts for 5.6 months, ending around May 4. On January 30, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 83% of the time, and overcast or mostly cloudy 17% of the time.

The cloudier part of the year begins around May 4 and lasts for 6.4 months, ending around November 15. On June 2, the cloudiest day of the year, the sky is overcast or mostly cloudy 76% of the time, and clear, mostly clear, or partly cloudy 24% 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 at Aeropuerto Internacional La Unión varies throughout the year.

The wetter season lasts 9.0 months, from September 9 to June 9, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 26% on May 20.

The drier season lasts 3.0 months, from June 9 to September 9. The smallest chance of a wet day is 10% on July 4.

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 26% on May 20.

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. Aeropuerto Internacional La Unión experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Aeropuerto Internacional La Unión. The most rain falls during the 31 days centered around November 4, with an average total accumulation of 2.2 inches.

The least rain falls around July 3, with an average total accumulation of 0.8 inches.

The length of the day at Aeropuerto Internacional La Unión varies over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 56 minutes of daylight; the longest day is June 21, with 13 hours, 20 minutes of daylight.

The earliest sunrise is at 6:02 AM on June 5, and the latest sunrise is 1 hour, 17 minutes later at 7:19 AM on January 17. The earliest sunset is at 6:01 PM on November 25, and the latest sunset is 1 hour, 24 minutes later at 7:25 PM on July 5.

Daylight saving time (DST) is not observed at Aeropuerto Internacional La Unión during 2017.

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 at Aeropuerto Internacional La Unión, 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 4% of 96% 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 at Aeropuerto Internacional La Unión experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 2.9 months, from June 3 to August 31, with average wind speeds of more than 4.8 miles per hour. The windiest day of the year is July 13, with an average hourly wind speed of 5.5 miles per hour.

The calmer time of year lasts for 9.1 months, from August 31 to June 3. The calmest day of the year is October 11, with an average hourly wind speed of 4.2 miles per hour.

The predominant average hourly wind direction at Aeropuerto Internacional La Unión is from the east throughout the year.

Aeropuerto Internacional La Unión 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 August 9 to November 11, with an average temperature above 83°F. The day of the year with the warmest water is October 1, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.7 months, from January 7 to April 28, with an average temperature below 80°F. The day of the year with the coolest water is February 25, with an average temperature of 78°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 1.9 months, from March 8 to May 5, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest day of the year is April 12, with an average of 6.8 kWh.

The darker period of the year lasts for 4.2 months, from September 14 to January 19, with an average daily incident shortwave energy per square meter below 5.0 kWh. The darkest day of the year is December 17, with an average of 4.5 kWh.

For the purposes of this report, the geographical coordinates of Aeropuerto Internacional La Unión are 19.758 deg latitude, -70.570 deg longitude, and 20 ft elevation.

The topography within 2 miles of Aeropuerto Internacional La Unión contains only modest variations in elevation, with a maximum elevation change of 381 feet and an average elevation above sea level of 60 feet. Within 10 miles contains only modest variations in elevation (2,615 feet). Within 50 miles contains large variations in elevation (6,617 feet).

The area within 2 miles of Aeropuerto Internacional La Unión is covered by water (54%), cropland (21%), and trees (17%), within 10 miles by water (45%) and trees (22%), and within 50 miles by water (53%) and trees (19%).

This report illustrates the typical weather at Aeropuerto Internacional La Unión, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Aeropuerto Internacional La Unión has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Cibao International Airport and Las Américas International Airport.

Other Data

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.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . 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.

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.