The Oklahoma Climatological Survey (OCS) hosted its 12th annual Atmospheric Radiation Measurement (ARM)/Mesonet Science Fair in February 2005. Nearly 100 students from across the state of Oklahoma participated in the fair. The students were mentored by ARM and Mesonet Scientists during project preparation and were judged by ARM and Mesonet scientists and students during the fair itself. This year’s upper-division winner incorporated input from ARM mentor scientists to improve her project, and it has since been accepted for the International Science Fair. This is the third straight year that a project from the OCS ARM/Mesonet Science Fair will appear at the International competition.