During the hot season, which usually lasts from early March to mid-June, very high temperatures are accompanied by intermittent winds and occasional dust storms. It may begin as early as late May in the south. Eventually, the rains taper off, and by late October cool, dry, northerly air has replaced the humid marine air over all of India except the south-eastern third of the peninsula. Average annual precipitation varies widely. In the driest parts of India, however, the rainfall is highly variable.
Temperature varies as does rainfall in different parts of India.
This is usually enough to keep the soil moist throughout the year. The natural vegetation associated with these regions is an exceedingly varied, broadleaf, evergreen rain forest, typically tall and dense. As a result, the soil has become less fertile. Where the forest has grown again, it is generally lower and less open than the original vegetation. In these areas, as average rainfall declines the forests become progressively shorter, less dense, and less varied.