Average Weather in Atenas Costa Rica
In Atenas, the wet season is warm, muggy, and overcast and the dry season is hot and partly cloudy. Over the course of the year, the temperature typically varies from 68°F to 89°F and is rarely below 65°F or above 92°F.
Based on the tourism score, the best time of year to visit Atenas for warm-weather activities is from early December to early March.
The temperature in Atenas varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.
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
Ayene, Equatorial Guinea (6,548 miles away); Boyolali, Indonesia (11,413 miles); and Malasila, Philippines (10,105 miles) are the far-away foreign places with temperatures most similar to Atenas (view comparison).
In Atenas, 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 in Atenas begins around November 24 and lasts for 4.5 months, ending around April 9. On January 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.
The cloudier part of the year begins around April 9 and lasts for 7.5 months, ending around November 24. On June 5, 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 Atenas varies significantly throughout the year.
The wetter season lasts 6.6 months, from May 5 to November 23, with a greater than 27% chance of a given day being a wet day. The chance of a wet day peaks at 50% on October 7.
The drier season lasts 5.5 months, from November 23 to May 5. The smallest chance of a wet day is 4% on January 26.
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 50% on October 7.
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. Atenas experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 9.6 months, from March 25 to January 14, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 29, with an average total accumulation of 6.7 inches.
The rainless period of the year lasts for 2.4 months, from January 14 to March 25. The least rain falls around February 5, with an average total accumulation of 0.4 inches.
Average Monthly Rainfall
The length of the day in Atenas does not vary substantially over the course of the year, staying within 42 minutes of 12 hours throughout. In 2018, the shortest day is December 21, with 11 hours, 33 minutes of daylight; the longest day is June 21, with 12 hours, 43 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:15 AM on May 28, and the latest sunrise is 45 minutes later at 6:00 AM on January 27. The earliest sunset is at 5:12 PM on November 16, and the latest sunset is 51 minutes later at 6:03 PM on July 12.
Daylight saving time (DST) is not observed in Atenas during 2018.
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.
Atenas experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 8.1 months, from April 13 to December 15, during which time the comfort level is muggy, oppressive, or miserable at least 27% of the time. The muggiest day of the year is June 4, with muggy conditions 86% of the time.
The least muggy day of the year is February 2, with muggy conditions 7% 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 Atenas experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 3.6 months, from December 18 to April 7, with average wind speeds of more than 3.3 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 4.2 miles per hour.
The calmer time of year lasts for 8.4 months, from April 7 to December 18. The calmest day of the year is June 16, with an average hourly wind speed of 2.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Atenas varies throughout the year.
The wind is most often from the west for 3.4 weeks, from May 21 to June 14 and for 2.0 months, from August 30 to October 30, with a peak percentage of 45% on September 30. The wind is most often from the east for 2.5 months, from June 14 to August 30 and for 6.7 months, from October 30 to May 21, with a peak percentage of 49% on July 23.
Atenas 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 does not vary significantly over the course of the year, remaining within 1°F of 83°F throughout.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Atenas 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 Atenas for general outdoor tourist activities is from early December 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 Atenas for hot-weather activities is from early December to early April, with a peak score in the first week of January.
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 Atenas 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 significant seasonal variation over the course of the year.
The brighter period of the year lasts for 2.5 months, from January 31 to April 13, 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 5.9 months, from May 18 to November 15, with an average daily incident shortwave energy per square meter below 4.4 kWh. The darkest day of the year is October 11, with an average of 3.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Atenas are 9.975 deg latitude, -84.379 deg longitude, and 2,195 ft elevation.
The topography within 2 miles of Atenas contains very significant variations in elevation, with a maximum elevation change of 1,667 feet and an average elevation above sea level of 2,226 feet. Within 10 miles contains very significant variations in elevation (4,764 feet). Within 50 miles also contains extreme variations in elevation (11,283 feet).
The area within 2 miles of Atenas is covered by grassland (57%) and trees (34%), within 10 miles by grassland (45%) and trees (35%), and within 50 miles by trees (43%) and water (24%).
This report illustrates the typical weather in Atenas, 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, Juan Santamaría International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Atenas.
At a distance of 19 kilometers from Atenas, 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 Atenas 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 .
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.