The climate of New Delhi is a hot semi-arid climate (Köppen ''BSh'') bordering on a dry-winter humid subtropical climate (Köppen ''Cwa'') with high variation between summer and winter in terms of both temperature and rainfall. The temperature varies from  in summers to around  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 with dust storms, relatively dry and mild winters with wildfire haze, and a monsoonal period. 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 ; monthly daily mean temperatures range from approximately . New Delhi's highest temperature ever recorded is  on 26 May 1998 while the lowest temperature ever recorded is  on 11 January 1967, both of which are recorded at Indira Gandhi International Airport (formerly known as Palam Airport). The average annual rainfall is , most of which is during the monsoons in July and August.