 While the entire country lies in the tropics, there is quite a large difference in climate between Northern and Southern Vietnam.Northern Vietnam has a humid subtropical climate, with a full four seasons, with much cooler temperatures than in the South (which has a tropical savanna climate), as well as winters that can get quite cold, sometimes with frost and even (rarely) snowfall.The lowest temperature reached in Hanoi was 2.7 °C in 1955.