The mildest winters and hottest summers were found in the "humid subtropical climate".
Explanation:
Humid sub-tropical climate refers to a climate zone seen by humid and hot summer, with cold or mild winters. Such climates usually lie on the south-east part of all continents, typically between 25 ° to 35 ° latitudes, and are situated from neighbouring tropical climates in a pole ward position.
According to the Koppen climates classification, the Cfa and Cwa climate zones are defined as humid sub-tropical or mild temperate climate. The humid subtropical climate is mostly covered in the coastal south-eastern South Africa; east Asia from northern India to Japan via southern China; south-eastern United States, south-eastern South America and eastern Australia.