Flash floods often wash out roads in the Andean region.
Cartagena and the Caribbean coast are disproportionally wet in October.
Low water levels in the Amazon mean excellent hiking and white-sand beaches.
Prices everywhere are at their lowest.
Bogotá, Medellín and Cali suffer a secondary rainy season in April/May.
Best whale-watching is July to October on the Pacific coast.
Cartagena shines through April, hard rains begin in May.
Sunny skies and warmish days throughout the Andes.
Dry everywhere but the Amazon.
San Andrés and Providencia are gorgeous.
Prices countrywide are at their highest.