where does it get the hottest in the united states
Phoenix
Phoenix, Arizona
Phoenix has a hot desert climate (Köppen: "BWh"), typical of the Sonoran Desert and is the largest city of America in this climatic zone. Phoenix has long, extremely hot summers and short, mild winters. The city is within one of the world's sunniest regions, with its sunshine duration comparable to the Sahara region. With 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. 
wiki:11617995
Phoenix, Arizona [SEP] Climate
Phoenix has a hot desert climate (Köppen: "BWh"), typical of the Sonoran Desert and is the largest city of America in this climatic zone. Phoenix has long, extremely hot summers and short, mild winters. The city is within one of the world's sunniest regions, with its sunshine duration comparable to the Sahara region. With 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 including most days from late May through early October.