Temperatures are very extreme, with diurnal temperature ranges in the highlands the greatest in the world. It is common for afternoon temperatures to be over 30 °C (85 °F) yet mornings can be extremely frosty and fog can cut visibility to near zero percent. As a result, there is much more natural vegetation in 'Asir than in any other part of Saudi Arabia, with sheltered areas even containing areas of dense coniferous forests, though more exposed ridges still are very dry. 'Asir is home to many farmers who chiefly grow wheat and fruit crops, though irrigation has greatly expanded production in modern times.
http://en.wikipedia.org/wiki/%27Asir_Province
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