East Africa straddles the equator and is known as a "year round destination" which can be visited anytime. The hottest months are late January to end of March while the coolest are July and August. There are two rainy seasons, known as "the long rains", between late March and early June and the "short rains" during November and December. Global weather patterns are changing and sometimes the rains fail completely in some parts and there is a period of drought or there may be heavy rains outside the normal rainy season. However when it rains it tends to be mainly at night or in the early morning which means there can still be sunny days in between. Many safari camps close during May when the long rains are at their height, as the tracks and roads get muddy and it may not be possible for the vehicles to take visitors on game drives. During the hot months of January to March conditions can often be dry and dusty and the animals may congregate near water-holes so that there is excellent wildlife viewing. Just after the rainy seasons, in June or again in December, many of the animals have their young to coincide with the better grazing from new grass following the rains. The wildebeest migration moves into the Mara between July and September and this is when many visitors come to Kenya and the parks can get more crowded with safari tourist vehicles.