Previous research at PSC has shown significant variation in conditions (temperature and humidity) among different compartments on trucks transporting market pigs. This study examined conditions in truck compartments in greater depth by measuring temperature and humidity variation during transportation of market pigs throughout the year. Pigs were transported from a commercial farm in Saskatchewan to a packing plant on a weekly basis, involving approximately 7.5 hours of travel. Pigs were exposed to variable temperatures during transport in different seasons with pigs transported in the ‘belly’, upper-front and middle-front compartments encountering the least favourable conditions.