Dubai has a unique tropical desert climate, moderated by the sea. Nighttime temperatures range from the mid-50sF in winter to the 80sF in summer. Daytime temperature range from 75F in the winter to the 100sF in summer. High humidity also occurs in summer, as the very warm ocean waters (99F in summer) cause risks for tropical storms and hurricanes in the Persian Gulf region. Rain can occur in the form of summer thunderstorms/monsoons that don't last too long, or in winter storms. Water temperatures range from 75F in the winter to the 80sF in spring and fall, and the 90sF in summer. Evidence of the tropical climate of Dubai can be found in its growth, as coconut palms and Christmas palms (both grown exclusivey in tropical and semi-tropical locales) are commonly planted in the city