Daily and seasonal variation of muscid flies (Diptera: Muscidae) in Chiang Mai province, northern Thailand

•Muscid flies are of medical and veterinary importance worldwide.•Understanding flight activity and fluctuations of muscid fly abundances as related to climatic factors will be useful for both designing laboratory-rearing systems and establishing effective control programs.•Our study demonstrates daily flight activity and seasonal abundance of muscid flies in relation to relative humidity and temperature varied among species and microhabitats.