 Average monthly temperatures in Lock Haven range from 26.5 °F in January to 72.2 °F in July, while in Renovo they range from 25.6 °F in January to 71.0 °F in July.As of the census of 2000, there were 37,914 people, 14,773 households, and 9,927 families residing in the county.The population density was 43 people per square mile (16/km²).