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.