Friday is expected to be this year's coldest day so far, with a wind chill advisory lasting until noon.
Thursday's high temperatures peaked at 18 degrees in the early morning, with area experiencing a steady decrease in temperatures throughout the day, said meteorologist Tim Gross of the National Weather Service.
Overnight temperatures were expected to fall below zero for the first time since Jan. 22, he said. Temperatures may drop to 4 below zero and, fueled by winds of 10 to 20 miles per hour, create a wind chill estimated to be as low as 25 degrees below zero.
Despite mostly sunny skies Friday, temperatures are expected to max out at 13 degrees. This pales in comparison to the record low of 21 degrees below zero set in 1996, yet it remains lower than the average highs of the low 30s for the end of January, Mr. Gross said.
The phenomenon of colder temperatures after a snowfall is commonly attributed to snow's high "albedo," the intensity at which something reflects light and radiation from the sun, Mr. Gross explained. This radiation is "bounced" back into the atmosphere rather than warming the earth, he added.
Once the snow melts sometime next week, temperatures are expected to return to normal, the meteorologist said.
Today is Friday, Aug. 22, the 234th day of 2014. There are 131 days left in the year. 1864 -- 150 years ago: The ferry boat, Rock Island, having been put in good order at the boat yard is now making her regular trips, much to the gratification of those who have to cross the river. 1889 -- 125 years ago: W.J. Gamble, for many years superintendent of the Moline & Rock Island railway, leased the Fourth Avenue Hotel and renovated and refurnished it throughout. 1914 -- 100 years ago: Pending the building of new public schools or additions to the present ones to provide adequate room for all the children, the board of education decided that pupils younger than 6 years old would not be accepted in Rock Island schools. 1939 -- 75 years ago: The fifth annual New Windsor Fair and Horse show, which has been delayed for two days because of unfavorable weather, got off to a new start last night. The parade was held this morning. 1964 -- 50 years ago: The Rock Island County Fair and Rodeo will celebrate its silver anniversary this year. The fair opens Tuesday and will run through Saturday and offers entertainment and activity for young and old. 1989 -- 25 years ago: Earl Hanson School, Rock Island, joins the Program to Assist Latch Key Student, which aids working parents. PALS is a before and after school program for grades 1-6 in certain Rock Island public and private schools.