This winter has mostly been marked by mild temperatures, but tonight's bone-chilling forecast should serve as reminder that there are likely many cold days ahead.
Today's high temperature is expected to be 25 degrees Fahrenheit, according to the National Weather Service website, and there is a slight chance of snow showers.
Tonight's low temperature could bottom out at 10 degrees. Factor in the wind chill - wind speeds are expected to top out at 16 mph - and it could feel as cold as zero.
That's in stark contrast to data compiled over December 2011.
The National Weather Service's closest weather station is in Harrisburg, which found that the average high and low temperatures for the greater Harrisburg area last month were 47 and 30 degrees Fahrenheit, respectively.
The high temperature was a very un-December-like 61 degrees, recorded Dec. 6. The low temperature came in at 19 degrees on Dec. 12.
December 2010 was much colder, with an average high and low of 37 and 24 degrees.
The normal average high and low for the month of December is 41 and 26 degrees, according to National Weather Service data.
The mild weather is expected to return quickly, with the daily high temperature expected to rise throughout the week and reaching 46 degrees Saturday.