Pohnpei is one of the wettest spots on Earth, with an annual rainfall of about 200 inches a year in Kolonia and as much as 400 inches in the interior. Rain falls heavily throughout the year, though January through March are the least rainy months. Northeasterly trade winds blow most of the year, but damaging tropical storms generally bypass Pohnpei. The temperature averages 81°F year round. Evenings are mild, in the low 70s, and daytime temperatures seldom exceed the upper 80s. Humidity is high, averaging 89%, resulting in rapid growth of mildew and mold in non-air-conditioned environments. Air quality is excellent and free of pollutants.