Although Macau is located in the tropics, it has a humid subtropical climate (Köppen climate classification "Cwa"), because the Siberian pressure system in the winter pushes cool air further south than similar semipermanent permanent high pressure systems. Its average year-round temperature is . Summers are very hot and humid: the July average temperature is and the highest daytime temperature could reach . However, the heat is generally less intense than many places in mainland China due to the coastal location. Winters are short and mild: the January average is and the lowest temperature could drop to , but very rarely any lower. There is about of rainfall annually, with drier winters.