Climate thumb|300px|Sri Lanka map of Köppen climate classification zones thumb|Sri Lanka is the nineteenth most water stressed country in the world. Sri Lanka's climate can be described as tropical, and quite hot. Its position between 5 and 10 north latitude endows the country with year-round warm weather, moderated by ocean winds and considerable moisture. The average temperature ranges from a low of in Nuwara Eliya in the Central Highlands (where frost may occur for several days in the winter) to a high of in Trincomalee on the northeast coast (where temperatures may reach ). The average yearly temperature for the country as a whole ranges from . Day and night temperatures may vary by . January is the coolest month, especially in the highlands, where overnight temperatures may fall to . May, the hottest period, precedes the summer monsoon rains.
Climate thumb|300px|Sri Lanka map of Köppen climate classification zones thumb|Sri Lanka is the nineteenth most water stressed country in the world. Sri Lanka's climate can be described as tropical, and quite hot. Its position between 5 and 10 north latitude endows the country with year-round warm we.ather, moderated by ocean winds and considerable moisture. The average temperature ranges from a low of in Nuwara Eliya in the Central Highlands (where frost may occur for several days in the winter) to a high of in Trincomalee on the northeast coast (where temperatures may reach ). The average yearly temperature for the country as a whole ranges from . Day and night temperatures may vary by  January is the coolest mont,h, especially in the highlands, where overnight temperatures may fall to . May the hottest period, precedes the summer monsoon rains.