Climate and Average Weather Year Round in Tejar Costa Rica

In Tejar, the wet season is muggy and overcast, the dry season is partly cloudy, and it is warm year round. Over the course of the year, the temperature typically varies from 67°F to 84°F and is rarely below 65°F or above 86°F.

Based on the tourism score, the best time of year to visit Tejar for warm-weather activities is from early December to mid March.

The temperature in Tejar varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

In Tejar, 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 Tejar begins around November 23 and lasts for 4.5 months, ending around April 8.

The clearest month of the year in Tejar is January, during which on average the sky is clear, mostly clear, or partly cloudy 62% of the time.

The cloudier part of the year begins around April 8 and lasts for 7.5 months, ending around November 23.

The cloudiest month of the year in Tejar is June, during which on average the sky is overcast or mostly cloudy 94% 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 Tejar varies significantly throughout the year.

The wetter season lasts 6.9 months, from May 2 to November 28, with a greater than 29% chance of a given day being a wet day. The month with the most wet days in Tejar is September, with an average of 15.0 days with at least 0.04 inches of precipitation.

The drier season lasts 5.2 months, from November 28 to May 2. The month with the fewest wet days in Tejar is March, with an average of 2.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Tejar is September, with an average of 15.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 52% on October 6.

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. Tejar experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Tejar. The month with the most rain in Tejar is October, with an average rainfall of 6.7 inches.

The month with the least rain in Tejar is March, with an average rainfall of 0.6 inches.

The length of the day in Tejar does not vary substantially over the course of the year, staying within 41 minutes of 12 hours throughout. In 2024, the shortest day is December 21, with 11 hours, 33 minutes of daylight; the longest day is June 20, with 12 hours, 42 minutes of daylight.

The earliest sunrise is at 5:15 AM on May 27, and the latest sunrise is 44 minutes later at 5:59 AM on January 28. The earliest sunset is at 5:11 PM on November 15, and the latest sunset is 50 minutes later at 6:02 PM on July 12.

Daylight saving time (DST) is not observed in Tejar during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

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.

Tejar experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.4 months, from April 2 to December 13, during which time the comfort level is muggy, oppressive, or miserable at least 28% of the time. The month with the most muggy days in Tejar is October, with 24.9 days that are muggy or worse.

The month with the fewest muggy days in Tejar is January, with 3.0 days that are muggy or worse.

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 Tejar experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 2.8 months, from August 15 to November 8, with average wind speeds of more than 2.8 miles per hour. The windiest month of the year in Tejar is October, with an average hourly wind speed of 3.6 miles per hour.

The calmer time of year lasts for 9.2 months, from November 8 to August 15. The calmest month of the year in Tejar is December, with an average hourly wind speed of 2.0 miles per hour.

The predominant average hourly wind direction in Tejar varies throughout the year.

The wind is most often from the south for 1.0 months, from April 8 to May 9; for 3.4 weeks, from July 7 to July 31; and for 4.1 weeks, from November 17 to December 16, with a peak percentage of 41% on July 24. The wind is most often from the west for 1.9 months, from May 9 to July 7 and for 3.6 months, from July 31 to November 17, with a peak percentage of 65% on October 1. The wind is most often from the east for 3.7 months, from December 16 to April 8, with a peak percentage of 37% on January 1.

Tejar 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.

To characterize how pleasant the weather is in Tejar 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 Tejar for general outdoor tourist activities is from early December to mid 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 Tejar for hot-weather activities is from mid December to early April, with a peak score in the first week of January.

Methodology

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 Tejar 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.

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.

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 27 to April 11, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Tejar is March, with an average of 6.7 kWh.

The darker period of the year lasts for 6.0 months, from May 16 to November 15, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest month of the year in Tejar is June, with an average of 3.7 kWh.

For the purposes of this report, the geographical coordinates of Tejar are 9.746 deg latitude, -84.234 deg longitude, and 3,245 ft elevation.

The topography within 2 miles of Tejar contains extreme variations in elevation, with a maximum elevation change of 3,284 feet and an average elevation above sea level of 2,921 feet. Within 10 miles also contains extreme variations in elevation (8,035 feet). Within 50 miles also contains extreme variations in elevation (11,447 feet).

The area within 2 miles of Tejar is covered by grassland (37%), trees (32%), cropland (16%), and shrubs (15%), within 10 miles by trees (46%) and grassland (28%), and within 50 miles by trees (37%) and water (35%).