Because Costa Rica is located only about eight degrees north of the equator, the climate is tropical year round. However, this varies depending on elevation and rainfall. Therefore, it is much affected by the Geography of Costa Rica whose seasons are defined by how much it rains during a particular period. The year can be easily split into two periods: dry and wet. These two periods are what is known to the residents as Verano, summer and Invierno, winter. The verano dry season is from December to May. Invierno (wet season) is the period from May to November, and during this time, in many locations, it rains constantly.
Turrialba, in the Central Mountainous Region, of 3200 meters (11,000 feet), the average temperature is 15° to 18°C (59° to 65°F) is more temperate with temperatures that vary little, depending on altitude. Humidity is also higher on the Caribbean side than on the Pacific side. The mean annual temperature on the coastal lowlands is around 27°C (80°F), in the main populated areas of the Central Cordillera 21° (70°F), and on the summits of the highest mountains below 10° (50°F).