semiarid is a place that gets little rain
The tropical rainforest gets less rain each year.
A Dessert
rain shadow
Go on the roof and call for help
The driest place is Wadi Halfa in the Sudan with less than 2.54 mm of rain
It is classified as a desert because it averages less than 10 inches of rain every year.
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Inside. You should always place your rain gauge outdoor in a nice open space where there is nothing to hinder the rain falling directly into the gauge. Mount the gauge vertically and level, and check and empty it after every rain fall.
Generally rain clouds are not big enough to cover a whole country at one time. So it doesn't rain every where at the same time. There are other factors involved in producing rain eg the topography, the season.
The temperature is not warm enough in every place for rain forests to grow.
The second wettest place on Earth is in Lake Maracaibo in Venezuela. This place has rain for 10 hours every day.
Deserts receive much less rain than rain forests.