Temperatures colder than 10 degrees above zero are infrequent in New York. A typical winter averages three such days (in the 21st century the average has fallen to 2.2 days per winter.) Not surprisingly, two-thirds of NYC's frigid readings have occurred in January. The sweet spot is between January 16-22, with the peak day being January 18, which has had readings in the single digits nine times.
Since 1970 the earliest date for a single-digit reading has been December 3, which occurred in 1976; the latest was on February 26, 1970.
Temperatures of zero or below have been reported just ten times (since 1970), with the coldest reading of 2 below zero occurring on three occasions: January 17, 1977; January 21, 1985; and January 19, 1994. The coldest reading so far this century was in 2004 when the temperature fell to 1 above zero twice, on January 10 and January 16.
The winters of 1978-79 and 1993-94 have had the most days with single-digit readings, nine, followed by the winters of 1976-77, 2003-04 and 2004-05, which had eight. The most consecutive days with single digit temperatures is six, which happened between Feb. 9-14, 1979. By contrast, 13 winters have had no readings below 10 degrees, including four of the past six (and, so far, the current winter as well).
Finally, only one day since 1970 has had a high temperature in the single digits. It occurred during the great Arctic outbreak of January 1985. On January 21 the high reached only 9 degrees (after an AM low of -2). That reading was reached shortly before midnight. During the daytime hours the temperature hovered around 7 degrees. This was the coldest high temperature for New York since February 15, 1943 when the high that day was just 8 degrees.