sentences:  Jacksonville, like some other parts of Illinois, would be culturally very continuous with early New England culture for most of its early history.According to the US Census Bureau, the county has a total area of , of which is land and (0.6%) is water.Average temperatures in the county seat of Jacksonville range from a low of in January to a high of in July; a record low of was recorded in February 1934 and a record high of was recorded in July 1954.