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In page Geography of Oman:

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Summer begins in March and lasts until September. The highest temperatures are registered in the interior, where readings up to a maximum of 50.8 °C (123.4 °F) have been recorded.[citation needed] On the Batinah coastal plain, summer temperatures seldom exceed 47 °C (116.6 °F), but, because of the low elevation, the humidity may be as high as 90 percent. The mean summer temperature in Muscat is 33 °C (91.4 °F), but the gharbī (Arabic: غَرْبِي, lit. 'western'), a strong wind that blows from the Rub' al-Khali, can raise temperatures from the towns on the Gulf of Oman by 6 °C (10.8 °F) to 10 °C (18 °F).