The response of 376 weaned bull calves to two different housing types was studied in a 2-year feedlot trial. Overall, animals with shelter had a higher rate of gain than animals with no shelter. The difference in the rate of gain between the housing types was, however, restricted to the coldest periods. No significant interaction between housing type and age of calf was observed. Regression analyses showed that whilst average daily temperature appeared to have a negligible effect on growth, temperature fluctuations between weighing days appeared to affect growth of calves in both housing types. Overall, climatic variables contributed more to the variance in gain of calves with shelter than of calves with no shelter.