Costa Rica is an equatorial country. The climate is termed as being tropical although there are major differences in weather throughout this small country. The major factor influencing these climactic differences in altitude. On average every one hundreds meters of height above sea level lowers the temperature by one degree centigrade. Thus the higher Central Valley where the Capital of San Jose is located has an average temperature four degrees lower than coastal regions. Average year round temperature here is 22 degrees celcius. Many people feel that the
The average temperature in Pacific coastal regions like Dominical and Uvita is 26 degrees centigrade.
The dry season runs from December to April and the rainy season from May to November.
However most of the rainy season is not too rainy. The vast majority of the rain falls in a far smaller time period of the main season. September to October have by far the greatest rainfall.
The months with the least temperature are from November to January. March to May are hottest.
Costa Rica does not really have a summer as such or defined seasonal changes.