Costa Rica lies in the tropics, between 8 and 11 degrees north of the equator.
It's no secret that over the years, Costa Rica has become a hotspot for expats. This might have something to do with the fact that Costa Rica is the most democratically stable country in Central America and boasts 5% of the world's flora and fauna in one tiny postage stamp sized country on this beautiful planet of ours. Then again there is the weather factor.
The weather in Guanacaste is tropical all year long and experiences the least rainfall in the entire country. A little known fact is that Costa Rica is located below the 10th parallel. What does that mean? Well, it means that hurricanes, except is very rare extreme conditions, can not form below the 10th parallel. No hurricane season here folks!
You can expect moderate temperatures but the rugged mountain chains' effect on factors such as wind and rain create many microclimates. Most people are surprised to learn that frost and ice can settle on some of the loftier peaks, such as Chirripó. Temperatures are somewhat higher on the Pacific side than on the Caribbean at the same elevation because clouds are more frequent. At sea level on either side, the annual average is always above 75°F (24°C). Some of the highest peaks average 54°F (12°C), though temperatures there can fall below freezing.
There is no spring or fall in Costa Rica. The seasons are called “verano” (summer) and “invierno” (winter). Summer is also called the dry season and stretches from December to April while the rainy season, or winter, lasts from May to November. However, temperatures vary from night to day more than between seasons. The difference in daily temperatures averages 14°F to 18°F (8°C to 10°C).
From November to January, cool breezes from the north funnel through the mountains of North America causing a small drop in temperature. This is one of the few countries in the world in which polar air gets this close to the equator. The warmest months are March, April, and May, and the wettest months are September and October. Rainfall varies from less than 59 inches (1,500mm) to over 190 inches (4,800mm) during these months.
The country's average rainfall pattern is in the range of 79 to 158 inches (2,000 to 4,000 mm). Precipitation can come in the form of a tropical downpour with impressive lightning and thunder (“aguacero”), steady rain or, the least common, continuous light rain for several days (“temporal”).
Even in the rainy season, it does not rain all day, every day. The rain usually begins in the early afternoon in the Central Valley and other highland areas and later in the afternoon it reaches the Pacific lowlands. Each season has its own beauty and unique characteristics. In the rainy season the wealth of flora is plentiful and copiously vibrant. The dry season witnesses the flowering of orchids, bougainvilleas, “reina de la noche” (queen of the night), as well as beautiful colorful trees that only flower at this time