 Westmoreland has a humid continental climate ("Dfa"/"Dfb").Average monthly temperatures in Greensburg range from 28.7° F in January to 71.8° F in July, while in Murrysville they range from 29.4° F in January to 73.1° F in July, in Latrobe they range from 28.9° F in January to 72.0° F in July, and in Ligonier they range from 28.1° F in January to 71.1° F in July.At the 2010 census, there were 365,169 people, 153,650 households and 101,928 families residing in the county.