Which environmental condition can significantly affect mosquito populations?

High humidity plays a crucial role in influencing mosquito populations. Mosquitoes thrive in environments that provide ample moisture because female mosquitoes require water not only for breeding but also for survival. High humidity ensures that there are suitable breeding sites, such as standing water, where mosquitoes can lay their eggs. Additionally, humidity impacts the overall activity level of mosquitoes; they are generally more active in humid conditions, which enhances their ability to reproduce and find hosts for feeding.

While cold temperatures and dry weather can certainly impact mosquito populations, these conditions do not promote their growth as effectively as high humidity does. Cold temperatures tend to force mosquitoes into dormancy or can even lead to their death, while dry weather can lead to a reduction in available breeding sites because water sources may evaporate. Therefore, high humidity is the most significant environmental condition that supports and increases mosquito populations.