The climate in Oranjestad is hot, oppressive, extremely windy, and overcast. Over the course of the year, the temperature typically varies from 77°F to 90°F and is rarely below 74°F or above 93°F.
Click on each chart for more information.
Based on the beach/pool score, the best time of year to visit Oranjestad for hot-weather activities is from late December to late March.
The temperature in Oranjestad varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.
Average High and Low Temperature
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
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 average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil 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 11 and lasts for 3.9 months, ending around April 6. On January 14, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy54% of the time, and overcast or mostly cloudy46% of the time.
The cloudier part of the year begins around April 6 and lasts for 8.1 months, ending around December 11. On October 8, the cloudiest day of the year, the sky is overcast or mostly cloudy82% of the time, and clear, mostly clear, or partly cloudy18% of the time.
Cloud Cover Categories
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.
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 17 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 17. 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
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
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. Oranjestad experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 4.4 months, from August 24 to January 3, 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 7.6 months, from January 3 to August 24. The least rain falls around March 24, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.
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 2018, 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 number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
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 19, and the latest sunset is 59 minutes later at 7:10 PM on July 11.
Daylight saving time (DST) is not observed in Oranjestad during 2018.
Sunrise & Sunset with Twilight
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
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
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.
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 18.4 miles per hour. The windiest day of the year is June 16, with an average hourly wind speed of 21.5 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 15.3 miles per hour.
Average Wind Speed
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The predominant average hourly wind direction in Oranjestad is from the east throughout the year.
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
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 7 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
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
Best Time of Year to Visit
To characterize how pleasant the weather is in Oranjestad 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 Oranjestad for general outdoor tourist activities is from late December to early March, with a peak score in the third week of January.
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
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 Oranjestad for hot-weather activities is from late December to late March, with a peak score in the third week of January.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
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 Oranjestad 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
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within 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
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.
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 2.3 months, from February 15 to April 25, with an average daily incident shortwave energy per square meter above 6.4 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
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
For the purposes of this report, the geographical coordinates of Oranjestad are 12.524 deg latitude, -70.027 deg longitude, and 36 ft elevation.
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 only modest variations in elevation (659 feet). Within 50 miles contains significant 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.
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.
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.