Seasonally, summers are generally hot and humid throughout the entire region. The Bermuda High pumps hot and moist air mass from the tropical Atlantic Ocean and eastern Gulf of Mexico westward toward the southeast United States, creating the typical sultry tropical summers. Daytime highs are often in the upper 80s to lower 90s F. Rainfall is summer concentrated along the Gulf Coast and the South Atlantic coast from Norfolk, Virginia southward, reaching a sharp summer monsoon-like pattern over peninsular Florida, with dry winters and wet summers. Sunshine is abundant across the southeastern United States in summer, as the rainfall often comes in quick, but intense downpours. The mid-South, especially Tennessee, and the northern halves of Mississippi, Alabama, and Georgia, have maximum monthly rainfall amounts in winter and spring, owing to copious Gulf moisture and clashes between warm, moist air from the Gulf of Mexico and cold, dry air from Canada during the cold season. In this area, December, March, or April are typically the wettest months; August to October, the driest months (for example, in Tupelo, MS, Huntsville, AL and Memphis, TN).