The climate of New Delhi is a monsoon-influenced humid subtropical climate (Köppen Cwa) bordering a hot semi-arid climate (Köppen BSh) with high variation between summer and winter in terms of both temperature and rainfall. The temperature varies from 46 °C (115 °F) in summers to around 0 °C (32 °F) in winters. The area's version of a humid subtropical climate is noticeably different from many other cities with this climate classification in that it features long and very hot summers, relatively dry and mild winters, a monsoonal period, and dust storms. Summers are long, extending from early April to October, with the monsoon season occurring in the middle of the summer. Winter starts in November and peaks in January. The annual mean temperature is around 25 °C (77 °F); monthly daily mean temperatures range from approximately 14 to 34 °C (57 to 93 °F). New Delhi's highest temperature ever recorded is 48.4 °C (119.1 °F) on June 28, 1883 while the lowest temperature ever recorded is −2.2 °C (28.0 °F) on January 11, 1967, both of which are recorded at Indira Gandhi International Airport (formerly known as Palam Airport). The average annual rainfall is 714 millimetres (28.1 in), most of which is during the monsoons in July and August.