The former city of Tokyo and the majority of Tokyo prefecture lie in the humid subtropical climate zone (Köppen climate classification ''Cfa''), with hot, humid summers and mild to cool winters with occasional cold spells. The region, like much of Japan, experiences a one-month seasonal lag, with the warmest month being August, which averages , and the coolest month being January, averaging . The record low temperature is  on January 13, 1876, while the record high is  on July 20, 2004. 