"Black flies are active only during the day. They do not bite at night. Depending on weather, black flies tend to be more active at certain times of day. Activity peaks tend to occur around 9:00 to 11:00 AM and again from 4:00 to 7:00 in the late afternoon and early evening, or until the sun falls below the horizon. They tend to be most active on humid, cloudy days and just before storms" extension.unh.ed
"Black flies are active only during the day. They do not bite at night.
Depending on weather, black flies tend to be more active at certain times of day.
Activity peaks tend to occur around 9:00 to 11:00 AM and again from 4:00 to 7:00
in the late afternoon and early evening, or until the sun falls below the horizon.
They tend to be most active on humid, cloudy days and just before storms" extension.unh.ed
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