This date in 1917 was the coldest day on record for Baltimore. After an overnight low of minus-3 degrees Fahrenheit, the mercury failed to reach double digits, stalling at 9 degrees. The next day wasn't much better, with a high of just 12 degrees. For 14 days, thermometers never reached the other side of 32 degrees. River navigation ceased by Dec. 9. There were 8 to 10 inches of ice at the mouth of the Patuxent River. It was the coldest December here until 1989.