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Phoenix has an arid climate, and its average annual maximum temperature is the highest of any major US city. In fact, out of the world's large urban areas, only some cities around the Persian Gulf, such as Riyadh, Saudi Arabia, and Baghdad, Iraq, have higher average summer temperatures. The temperature reaches or exceeds 100 °F (38 °C) on an average of 89 days during the year, including most days from early June through early September. On June 26, 1990, the temperature reached an all-time high of 122 °F (50 °C).[15] Overnight lows greater than 80 °F occur frequently each summer, with the average July low being 81 °F and the average August low being 80 °F. The all-time highest low temperature was 96 °F (36 °C), which occurred on July 15, 2003.
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