The city has been almost entirely rebuilt four times, following devastation caused by a cyclone in 1897, another one in 1937, Japanese air raids during World War II, and Cyclone Tracy in 1974. The Darwin region, like much of the Top End, has a tropical climate, with a wet and dry season. A period known locally as "the build up" leading up to Darwin's wet season sees temperature and humidity increase. Darwin's wet season typically arrives in late November to early December and brings with it heavy monsoonal downpours, spectacular lightning displays, and increased cyclone activity. During the dry season, the city has clear skies and mild sea breezes from the harbour.