<P> The urban village of Paradise Valley is distinct from the nearby Town of Paradise Valley . Although the urban village is part of Phoenix, the town is independent . </P> <P> In addition to the above urban villages, Phoenix has a variety of commonly referred - to regions and districts, such as Downtown, Midtown, Uptown, West Phoenix, North Phoenix, South Phoenix, Biltmore Area, Arcadia, and Sunnyslope . </P> <P> Phoenix has a hot desert climate (Köppen climate classification BWh), typical of the Sonoran Desert . Phoenix has long, extremely hot summers and short, mild to warm winters . The city is located within the sunniest region in the world . Measuring 3,872 hours of bright sunshine annually, Phoenix receives the most sunshine of any major city on Earth . Average high temperatures in summer are the hottest of any major city in the United States . On average, there are 107 days annually with a high of at least 100 ° F (38 ° C) including most days from late May through early October . Highs top 110 ° F (43 ° C) an average of 18 days during the year . On June 26, 1990, the temperature reached an all - time recorded high of 122 ° F (50 ° C). Despite the city's claim to the most extreme heat in summer, however, it does not have the highest average annual temperature in the contiguous United States . In that respect, it comes second to Miami; Phoenix has an average daily temperature of 75 ° F (24 ° C), compared to Miami's 77 ° F (25 ° C). </P> <P> Unlike most desert locations which undergo drastic fluctuations between day and nighttime temperatures, Phoenix's diurnal temperature variation is limited by the urban heat island effect . As the city has expanded, average summer low temperatures have been steadily rising . The daily heat of the sun is stored in pavement, sidewalks, and buildings, and it is radiated back out at night . The daily normal low remains at or above 80 ° F (27 ° C) for an average of 67 days per summer . On July 15, 2003, Phoenix set its record for the warmest daily low temperature, at 96 ° F (36 ° C). </P>

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