Summers in Bahrain are hot and humid, and winters are relatively cool. Daily average temperatures in July range from a minimum of 29°C (84°F) to a maximum of 37°C (99°F); the January minimum is 14°C (57°F), the maximum 20°C (68°F). Rainfall averages less than 10 cm (4 in) annually and occurs mostly from December to March. Prevailing southeast winds occasionally raise dust storms.