Central Valley Region includes city of San Jose, Heredia, Escazu, Santa Ana, Cartago, Barva, Grecia, among others): usually weather here has an average of 22 °C or 72 °F. Dry season is December to March, with April and November as transitional months. July is usually the driest of the wet months and is considered a little dry season. The months of January through March are marked with persistent northeast winds and lots of sun.
Rainy season months in central valley are May through November. September and October are the rainiest months (averaging 26 inches per month) of the year, and the most humid.