I hate to admit it, but if you live in Florida, mosquito season is usually a year-round event. Normally the female mosquito, is going to feel pretty comfortable, as long as the average temperature is 50°F or higher. Here in Central Florida, especially the Tampa Bay area along the coast, the average temperature seldom remains below 50°F even in winter. Of course we did have this cold snap back in 2010, when just about every plant in my yard died, and temperatures at night dropped out in the 20s and stayed there for hours on end. That was an anomaly.
The temperature is not the only factor that has an effect a mosquito season here in Tampa Bay. It's the introduction of water. As you are well aware, it takes a water source, for mosquito to lay eggs. There are periods during the year, even here in the Tampa Bay area the rain is scarce, and that does have an impact on the mosquito population. It's a known fact; the mosquitoes can lay eggs year round, even in the dry season. Mosquitoes usually lay eggs and areas that are normally covered by water during the rainy season. As the rains began, and standing water starts to appear, those eggs that were laid, then start the lifecycle process of the mosquito.
In 2012, the mosquito season took off in the month of March, due to early rains and tepid conditions throughout the winter months. In years past, the rainy season, didn't really get started until late April or early May. Whenever, mild temperatures in the introduction of standing water, mosquitoes will breed a begin the search for their next meal. The mosquito season, normally runs nine months out of the year. During these times, it is wise to take all precautions necessary to protect yourself from the onslaught of hordes of flying biting mosquitoes.