Due the tropical rainforest climate temperature, humidity, and rains remain relatively constant throughout the year and have mean temperatures above 23°C (73.4°F) and around 30°C (86°F) most of the time.
There are two seasons in the South American Amazon basin: the low river season season, Amazon summer or vaciante (June to November), and the high river season, Amazon winter or creciente (December to May).
During the vaciante, many canals, streams and rivers dry out, so the trips by boats are longer but fishing is much easier and waters leave behind fertile silt and moisture, where villagers plant rice mainly, but also beans and some vegetables.
During the creciente, rivers rise several meters, lowlands become flooded (water-covered forests are ecosystems known as várzea or tahuampa), and the rivers and jungle combine to form breathtaking landscapes.
The lowest and highest average level of the Amazon River in Iquitos is 106.08 m (348 ft) and 118.6 m (389 ft), respectively. That is, it varies about 12.52 m (41 ft) between the low river and high river season.