 The coldest month of the year is January, when the average high temperature is around 53 °F (12 °C) and the average low temperature bottoms out at 33 °F (1 °C).The warmest temperature ever recorded in York County was in Rock Hill, was 106 °F (42 °C), on August 21, 1985, and the coldest temperature ever recorded was also in Rock Hill at -6 °F (-21 °C), on January 21, 1983.A border county separating North Carolina and South Carolina, York County shares boundaries with the following counties in both states