Average Weather in Oranjestad Aruba
In Oranjestad, the temperature typically varies from 77°F to 90°F over the course of the year, and is rarely below 74°F or above 93°F.
The hot season lasts for 2.5 months, from July 26 to October 11, with an average daily high temperature above 89°F. The hottest day of the year is September 2, with an average high of 90°F and low of 81°F.
The cool season lasts for 2.9 months, from December 8 to March 4, with an average daily high temperature below 86°F. The coldest day of the year is January 20, with an average low of 77°F and high of 85°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
The length of the day in Oranjestad does not vary substantially over the course of the year, staying within 51 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 23 minutes of daylight; the longest day is June 21, with 12 hours, 52 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:13 AM on June 1, and the latest sunrise is 53 minutes later at 7:06 AM on January 24. The earliest sunset is at 6:11 PM on November 18, and the latest sunset is 59 minutes later at 7:10 PM on July 9.
Daylight saving time (DST) is not observed in Oranjestad during 2017.
Sunrise & Sunset with Twilight
In Oranjestad, 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 Oranjestad begins around December 10 and lasts for 3.9 months, ending around April 7. On January 14, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 54% of the time, and overcast or mostly cloudy 46% of the time.
The cloudier part of the year begins around April 7 and lasts for 8.1 months, ending around December 10. On October 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 82% of the time, and clear, mostly clear, or partly cloudy 18% 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 Oranjestad varies throughout the year.
The wetter season lasts 3.4 months, from September 18 to December 30, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 20% on November 25.
The drier season lasts 8.6 months, from December 30 to September 18. The smallest chance of a wet day is 2% on March 21.
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 20% on November 25.
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 in the year. Oranjestad experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 4.3 months, from August 24 to January 2, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 16, with an average total accumulation of 1.6 inches.
The rainless period of the year lasts for 7.7 months, from January 2 to August 24. The least rain falls around March 24, with and average total accumulation of 0.1 inches.
Average Monthly Rainfall
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 Oranjestad, 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, remaining a virtually constant 100% throughout.
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 Oranjestad experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 8.5 months, from December 8 to August 25, with average wind speeds of more than 9.9 miles per hour. The windiest day of the year is June 17, with an average hourly wind speed of 11.6 miles per hour.
The calmer time of year lasts for 3.5 months, from August 25 to December 8. The calmest day of the year is October 21, with an average hourly wind speed of 8.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Oranjestad is from the east throughout the year.
Oranjestad 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 3.0 months, from August 20 to November 21, with an average temperature above 82°F. The day of the year with the warmest water is September 29, with an average temperature of 83°F.
The time of year with cooler water lasts for 3.4 months, from January 6 to April 18, with an average temperature below 79°F. The day of the year with the coolest water is February 10, with an average temperature of 78°F.
Average Water Temperature
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 2.4 months, from February 14 to April 25, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest day of the year is March 21, with an average of 6.9 kWh.
The darker period of the year lasts for 2.3 months, from September 8 to November 17, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest day of the year is October 12, with an average of 4.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Oranjestad are 12.524 deg latitude, -70.027 deg longitude, and 36 ft elevation (map ).
The topography within 2 miles of Oranjestad contains only modest variations in elevation, with a maximum elevation change of 194 feet, and an average elevation above sea level of 49 feet. Within 10 miles contains significant variations in elevation (659 feet). Within 50 miles contains large variations in elevation (2,575 feet).
The area within 2 miles of Oranjestad is covered by artificial surfaces (51%), water (28%), and grassland (11%), within 10 miles by water (84%), and within 50 miles by water (92%).
This report illustrates the typical weather in Oranjestad, 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
There is only a single weather station, Queen Beatrix International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Oranjestad.
At a distance of 3 kilometers from Oranjestad, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Oranjestad according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
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 .