Dry season

From May to September, the rain belt lies in the northern hemisphere, and the southern tropics have their dry season.

During this time, some farmers move into cities, creating hubs of higher population density, and allowing the disease to spread more easily.

Researchers believe that the Amazon itself has an effect in bringing[clarification needed] the onset of the wet season: by growing more foliage, it evaporates more water.

[4] However, this growth appears only in the undisturbed parts of the Amazon basin, where researchers believe roots can reach deeper and gather more rainwater.

[5] It has also been shown that ozone levels are much higher in the dry than in the wet season in the Amazon basin.

Dry season in Laos . Long shadow of a dead tree with its branches on the dry fields of Don Det , a sunny day with blue sky and white clouds, late afternoon.