sentences:  Though temperatures average in the low-to-mid 20s (70s Fahrenheit), they are rather variable with frequent hot spells reaching approximately interrupted by cold fronts, which frequently bring violent thunderstorms and several days of cool and sometimes chilly weather.Although hot weather is frequent and many summers experience a few oppressively hot days of around , summer temperatures in the city are never extreme and have not exceeded in recent decades.The transitional seasons of spring and autumn are highly unpredictable and experience large temperature swings with periods of fine weather and temperatures around as early as March and late into October, alternating with much colder periods.