Tucson (/ˈtuːsɒn/ /tuːˈsɒn/) is a city with a population of 520,116. The Spanish name of the city, Tucsón [tukˈson], is derived from the O'odham Cuk Ṣon [tʃʊk ʂɔːn], meaning "(at the) base of the black [hill]", a reference to a basalt-covered hill now known as Sentinel Peak, also known as "A" Mountain.
Tucson has hot summers and temperate winters. Tucson is almost always cooler and wetter than Phoenix because of its higher elevation. Summer is characterized by daytime temperatures that exceed 100 °F (38 °C) and overnight temperatures between 66 and 85 °F. Early summer is characterized by low humidity and clear skies; mid-summer and late summer are characterized by higher humidity and cloudy skies.