Do Black Flies Like Hot Weather?

SYRACUSE, N.Y. -- If you're an outdoors enthusiast in the Northeast, you know black flies can be a constant source of torment every summer. ... With so much of the year dominated by snow and slush, Upstate New Yorkers refuse to stay inside when the weather is warm.

Does heat kill black flies?

An annual spring rite of passage, the scourge of the black fly lasts roughly from Mother's Day to Father's Day. As the weather heats up, the flies die off.

Does temperature affect black flies?

Water temperature most often exceeds the value important to the start of the development of these black fly species during March and April. The findings of the present study show that the hatching time of the two black fly species is also related to the mean water temperature in March and April.