Dry season: Difference between revisions

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The '''dry season''' is a yearly period of low rainfall, especially in the [[tropics]]. The weather in the tropics is dominated by the [[tropical rain belt]], which moves from the northern to the southern tropics and back over the course of the year. The tropical rain belt lies in the southern hemisphere roughly from October to March; during that time the northern tropics have a dry season with sparser [[precipitation (meteorology)|precipitation]], and days are typically sunny throughout. From April to September, the rain belt lies in the northern hemisphere, and the southern tropics have their dry season. Under the [[Köppen climate classification]], for [[tropical climate]]s, a dry season month is defined as a month when average precipitation is below {{convert|60|mm}}.<ref>{{cite web | url=http://www.hydrol-earth-syst-sci.net/11/1633/2007/hess-11-1633-2007.pdf | title=Updated world Köppen-Geiger climate classification map}}</ref>
The dry season has low humidity, and some watering holes and rivers dry up. This lack of water (and hence of food) may force many grazing animals to migrate to more fertile spots. Examples of such animals are [[zebraszebra]]s, [[elephantselephant]]s,<ref>{{cite news | url=http://www.dailymail.co.uk/pages/live/articles/news/worldnews.html?in_article_id=465016&in_page_id=1811 | title=It's dry season and elephants are desperately seeking water - but poachers lie in wait | author=TONY RENNELL | publisher=Daily Mail | location=London | date=June 29, 2007}}</ref> and [[wildebeest]]. Because of the lack of water in the plants, bushfires are common.<ref>{{cite web | url=http://burarra.questacon.edu.au/pages/seasons.html | title=Wet & Dry Seasons}}</ref>
Data shows that in Africa the start of the dry season coincides with a rise in the cases of [[measles]]—which researchers believe might be attributed to the higher concentration of people in the dry season, as agricultural operations are all but impossible without irrigation. During this time, some farmers move into cities, creating hubs of higher population density, and allowing disease to spread more easily.<ref>{{cite web | url=http://www.sciencedaily.com/releases/2008/02/080206131643.htm | title=Dry Season Brings On Measles In Sub-Saharan Africa | publisher=ScienceDaily | date=February 7, 2008}}</ref>