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.
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
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 23 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 23. 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.
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 6.5 months, from May 6 to November 22, 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 22 to May 6. 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 26 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 26. 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 2017, 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 29, 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 15, and the latest sunset is 51 minutes later at 6:03 PM on July 11.
Daylight saving time (DST) is not observed in Atenas during 2017.
Sunrise & Sunset with Twilight
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
Average Wind Speed
The predominant average hourly wind direction in Atenas varies throughout the year.
The wind is most often from the west for 3.1 weeks, from May 22 to June 13 and for 1.9 months, from September 1 to October 29, with a peak percentage of 48% on September 30. The wind is most often from the east for 2.6 months, from June 13 to September 1 and for 6.8 months, from October 29 to May 22, with a peak percentage of 53% 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
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 2.4 months, from January 30 to April 13, with an average daily incident shortwave energy per square meter above 6.2 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.
Time zones for aiports and weather stations are provided by AskGeo.com .