A study was conducted on the relationship of the attenuation coefficient of optical radiation by midges with the meteorological parameters of the atmosphere for the summer conditions of 2018 in Western Siberia. It is shown that the maximum values of the coefficient of attenuation of radiation by the midges are observed at the values of vertical turbulent heat flow from 0 to 60 W/m2, air temperature more than 5-7 C and relative air humidity from 30 to 85%. Minimum values of the coefficient of attenuation of radiation by the midges are observed at values of vertical turbulent heat flow more than 100 W/m2, as well as at negative values of vertical turbulent heat flow, air temperature less than 20 С and relative air humidity more than 60-70%.