The western area of Dubai benefits from small stretches of sandy beaches, which have helped to catalyse the city’s tourism industry. Dubai’s rulers have sought to increase the city’s limited seafronts, and, in the absence of natural offshore islands, developers were encouraged to construct giant man-made islands off the coast of the city. The most famous of these is Palm Jumeirah, which has the shape of a palm tree. Others include the “World” islands, a cluster of small islands positioned to resemble a world map when viewed from above. Like much of the Persian Gulf coastline, Dubai has a year-round hot climate. Humidity is high in the summer months and moderate the rest of the year. The coldest winter month is usually January, with lows of about 15 °C (49 °F), while the hottest summer month is July, with highs of more than 40 °C (104 °F).