When are Mosquitoes the Most Active in the US?

Mosquito Behavior & Activity

Geographic Location

Within North America, general mosquito activity generally increases from south to north and from coastal to inland habitats simply because the diversity and the size of mosquito populations increase, as well.

Active Near Water

While certainly not always the case, the likelihood of observing mosquitoes actively flying or taking a blood meal is greater in the southern states and those specific habitats that are close to large bodies of waters.

Meteorological Conditions Affecting Activity

Conditions that affect mosquito activity are:

Wind: Mild, little or no wind since mosquitoes generally are not strong flyers.
Temperature: Low temperatures that may reduce, suspend or entirely prevent adult flight activity, plus excessively high temperatures that also retard flight activity.
Warm temperatures of approximately 80° F are very favorable to most species of mosquitoes.
Humidity: Relative humidity is important to mosquito activity. In general, high humidity conditions favor mosquito activity, while low humidity suppresses activity and may even cause mortality.
Precipitation: Rainfall, if heavy enough may injure flying, exposed mosquitoes and force them to seek shelter, thus preventing flight.
Drought & Rainfall: Both drought and above normal rainfall conditions can considerably affect suitable breeding sites for mosquito development.
More Rain Means More MosquitoesFor example, a sustained, long drawn out drought will evaporate the surface water from a wetland and temporarily halt mosquito larval production. A mosquito development season with frequent rainfall will maintain a higher water level, which usually favors development of mosquitoes.

When are Mosquitoes the Most Active in the US?

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