What is the climate requirement for growing cotton ?

Cotton is a subtropical climate crop. Cotton requires a minimum temperature of 600 degrees Fahrenheit for germination, 70 degrees Fahrenheit for vegetative growth, and 80 degrees Fahrenheit with cool nights during the fruiting season. Unless cotton is produced on irrigated soils, cotton requires at least 50 cm of yearly rainfall. Rains and severe humid weather later in the cotton season may ruin the crop, reduce its ginning qualities, or encourage insect, pest, and disease attack. Rain at this stage will discolor the lint and impair its quality, therefore the weather should be clean while harvesting.