In the north, the rainy season is from August until November. Typhoons are frequent, but not too much of a problem. The north can be quite chilly in winter (Dec. - Feb.). The climate in the Delta is sub-equatorial with two main seasons. The wet season lasts from May to October with short downpours occurring almost every day. The dry season lasts from November to April with the last three months of this period being very hot and humid. Annual rainfall for the South is approximately 80 inches (2,000 millimeters) while temperatures remain relatively constant - on average between 77 and 95 F (25-35 C). Between July and November, Vietnam is hit by random, violent typhoons that develop off the coast in the South China Sea. They typically hit the central and north coasts and have been with increasing frequency over the past few years.