Taking the local weather in Sweeney Ranch into account can help you maximise your time at the pool during your trip. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and December, with an average of -6°C. The snowiest months in Sweeney Ranch are March, January, February and April, with each month seeing an average of 28 cm of snowfall.