Regarding the rainfall regime, it is interesting to note that

although rainfall is abundant or very abundant and regular throughout the year, there is a clear summer maximum and a winter minimum centered in autumn (without at any time a drought of ). The subtropical condition of Alabama's climate determines the alternation between the precipitation generating mechanisms of the tropical world and the temperate world. Tropical mechanisms predominate during the warm months in which the south and southeast flow favors the entry of tropical maritime air from the Gulf of Mexico and the Caribbean Sea. This is because, on the one hand, the North American continent overheats in summer, causing low thermal pressure, since, on the other hand, the Atlantic subtropical anticyclones (Bermuda high pressure, Azores Anticyclone ), increase in latitude and strengthen in summer, causing air circulation in a clockwise direction, and affecting both the Antilles and the Southeastern United States with their winds from the East, South or Southeast. These situations are what lead to the development of tropical depressions, tropical storms, easterly waves and hurricanes on the southern and eastern flanks of these anticyclones , common phenomena in Alabama that can have devastating consequences. Apart from these phenomena, simple convective storms are also very common, resulting from heat, humidity and instability, and which usually occur in the afternoons. In winter, the configuration of the Canadian anticyclone in the interior of the continent establishes a clear regime of northwesterly winds, with cool, dry, sunny and stable weather predominating. This dry weather is more common in autumn. Winter precipitation is mostly due to frontal systems in the temperate world, or to some tropical events that occur when continental flow subsides. Thus, it is possible that in some episodes of winter there may also be small convective outbreaks, or timid incursions of the trade winds and southeasterly winds on the coast of the Gulf of Mexico.