The objective of this study was to determine the effects of ambient air temperature and house-fly age on light-trap catch in urban environments. Musca domestica pupae were collected from USDA colonies and reared to adulthood. Adults were segregated into the following ages: one day, three days, five days, and seven days. One hundred flies from each age group were released inside an enclosed bioassay for four hours with ambient air temperature of 29°C. Ambient air temperature was increased to 35°C and study was repeated with the aforementioned age groups.