Havana's tropical climate is marked by warm winters and by hot summers, which can be insufferable. Cold spells occasionally strike Cuba in winter months, which for the most part are otherwise pleasant. The heaviest rainfall also occurs in summer months (May-October), when an umbrella is a good idea; summer rains typically occur in midafternoon, although prolonged downpours can last several days. Winter rains are usually associated with cold fronts and can be heavy and prolonged. Howling winter storms are not uncommon.
Summer months also coincide with hurricane season (June-November). Cuba's western provinces have been struck by several hurricanes in recent years. Havana is prone to flooding and disruption of electricity.
Late November, December and springtime are by far the best times to visit, with March and April the most pleasant months.