It is examined in present paper the connection between height of tropopause, wind speed measured at level of tropopause (in m/sec), height of wind maximum (in gpm) and the light-trap catch of forest maybeetle (Melolontha melolontha L.). The light-trap catch data of forest maybeetle (Melolontha melolontha L.) are from the material of national light-trap network in Hungary between 1966 and 1978. There were made 9 groups for data of the height of tropopause and 3-3 ones for data of the wind speed measured at level of tropopause (in m/sec) and the height of wind maximum (in gpm). The relative catch values were categorised according to the characteristics of tropopause on each day, after it these values were summarised and averaged. Correlation calculation was made between the features of tropopause and values of relative catch belonging to it. The significance level of difference of relative catch values, belonging to different categories, was calculated with t-test for the other two characteristics of tropopause. There are positive correlations between height of tropopause, wind speed at level of tropopause, height of wind maximum and number of caught insects.