The arrival of another arctic air mass brought some of the lowest wind chills as well as the lowest temperatures of the winter season to New Jersey on the 20th and 21st. As far as wind chill factors went, the first half of the day on the 20th was colder with wind chill factors as low as around 20 degrees below zero during the morning. Actual low temperatures were around zero. On the morning of the 21st, little, if any, wind was present as the arctic high pressure system was nearby. Low temperatures in more rural inland areas were lower, many were below zero, some well below zero. But, because of the lack of wind, wind chill factors nearly matched the air temperatures and it felt relatively warmer on the morning of the 21st.

Lowest hourly wind chill factors included 22 degrees below zero in Toms River (Ocean County), 21 degrees below zero in Belmar (Monmouth County), 20 degrees below zero in Trenton (Mercer County) and Morristown (Morris County), 19 degrees below zero at the Atlantic City International Airport (Atlantic County) and Wrightstown (Burlington County), 18 degrees below zero in Millville (Cumberland County), 17 degrees below zero in Lumberton (Burlington County), 15 degrees below zero in Somerville (Somerset County) and Wildwood (Cape May County) and 13 degrees below zero in Sussex (Sussex County).
Actual lowest temperatures on either the 20th or 21st included 17 degrees below zero in Walpack (Sussex County), 13 degrees below zero in Sussex (Sussex County), 9 degrees below zero in Toms River (Ocean County), 7 degrees below zero in Blairstown (Warren County) and Kingwood (Hunterdon County), 6 degrees below zero at the Atlantic City International Airport, 5 degrees below zero in Denville (Morris County) and Shamong (Burlington County), 4 degrees below zero in Skillman and Somerville (Somerset County) and also Dennis Township (Cape May County), 1 degree below zero in New Brunswick (Middlesex County) and Allentown (Monmouth County), zero in Belmar (Monmouth County), Trenton (Mercer County), Woodstown (Salem County), 1 degree above zero in Sea Girt (Monmouth County), Wildwood (Cape May County) and Mount Laurel (Burlington County), 2 degrees above zero in Sewell (Gloucester County), Harvey Cedars (Ocean County), Cherry Hill (Camden County) and Millville (Cumberland County), 3 degrees above zero in Atlantic City (Atlantic County) and 5 degrees above zero in West Cape May (Cape May County).

The low temperature of 6 degrees below zero on the 21st at the Atlantic City International Airport, not only broke the daily record, but was the coldest record so late in the season, the coldest day of the winter season and the coldest low temperature since January 1996. The low temperatures of zero on the 20th and 3 degrees above zero on the 21st in Trenton established new daily records. The low temperature of zero on the 20th matched the 24th for the lowest temperature of the season.

The latest cold outbreak was caused by an arctic high pressure system that arrived in New Jersey on the evening of the 20th. The wind and subsequent low wind chill values was caused by the pressure difference between the approaching high pressure system and an intensifying low pressure system that moved through the Canadian Maritimes overnight on the 19th and on the 20th. While some low temperatures were lower on the morning of the 21st, there was little if any wind and the air and wind chill values that morning were one in the same.  As the high pressure system moved offshore, more wintry precipitation arrived later in the day on the 21st.

Cold/Wind Chill in CAMDEN, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in GLOUCESTER, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in SALEM, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in CUMBERLAND, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold/Wind Chill in WESTERN ATLANTIC, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold/Wind Chill in WESTERN CAPE MAY, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Cold/Wind Chill in EASTERN CAPE MAY, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in EASTERN ATLANTIC, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in SOUTHEASTERN BURLINGTON, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in EASTERN OCEAN, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in WESTERN OCEAN, NEW JERSEY
From 19-FEB-15 23:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Cold/Wind Chill in WESTERN MONMOUTH, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 12:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Cold/Wind Chill in NORTHWESTERN BURLINGTON, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold/Wind Chill in MERCER, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold/Wind Chill in SOMERSET, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold/Wind Chill in SUSSEX, NEW JERSEY
From 19-FEB-15 22:00:00 to 20-FEB-15 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cold/Wind Chill in WARREN, NEW JERSEY
From 19-FEB-15 22:00:00 to 20-FEB-15 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in MORRIS, NEW JERSEY
From 20-FEB-15 02:00:00 to 20-FEB-15 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in MIDDLESEX, NEW JERSEY
From 20-FEB-15 01:00:00 to 20-FEB-15 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in EASTERN MONMOUTH, NEW JERSEY
From 20-FEB-15 00:00:00 to 20-FEB-15 12:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Cold/Wind Chill in HUNTERDON, NEW JERSEY
From 20-FEB-15 01:00:00 to 20-FEB-15 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet