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Time budgets for 14 cows housed in a three-row free stall pen were obtained for four filming sessions timed to capture different climatic conditions, with a range in mean pen temperature humidity index from 56.2 to 73.8. Mean lying time decreased from 10.9 h/d to 7.9 h/d from the coolest to the hottest session filmed. Time spent standing in the alley increased from 2.6 h/d to 4.5 h/d from the coolest to the hottest session filmed. There was a negative effect of increasing locomotion score over the summer with higher locomotion scores associated with less time spent standing in the alley. Time spent drinking increased from 0.3 to 0.5 h/d across the range in temperature humidity index. Filming session alone did not affect time spent standing in the stall, but the effect of locomotion score was significant, with score 2 and 3 cows standing in the stall longer than score 1 cows (4.0 and 4.4 compared with 2.9 h/d respectively).