Where from scores of flies and insects come out after rains?

Question

During summer months we can easily switch on the lights and open the windows in the night with not a single insect coming in. During daytime also no flies are seen even if there is some open drainage nearby and garbage accumulating. Let there be rains and scores of flying insects, mosquitoes and flies appear all of a sudden. All these creatures are not hibernating, they are produced but, how?

Answer 1

Many insects need water to lay their eggs, or to reproduce in, or to hatch from.  Others, like ants and termites, need the rain to soften the earth so the new queens can dig down and start new nests, and so their new eggs won't dry out.  Also, some insects need the humidity to keep from drying up when they fly about to breed, etc..  Small flys are a good example of this.  Mosquitoes "must" have water to lay their eggs in and for the larvae to grow  and develop.  Even water in puddles will do.  The "most" noticeable insects are the Termites and Ants, because their whole life cycle depends on the rains to soften the earth as I said.  They will wait for "years" if they have to, until it rains, and then the swarming, flying about everywhere,  mating,  and new nests, begins.

Answer 2

Their homes are getting a water covering. So they move.

Answer 3

they come out 4m plants easy

Answer 4

as their  hide outs get waterlogged  they come out  n  wander here n there chatting wid friends.

Answer 5

They r coming of dust and neatless