Early on the 2nd a tropopause polar vortex (TPV) was dislodged from its position over Hudson Bay. Over time temperatures within the TPV had become very cold, with mid level temperatures around -40 degrees Celsius. The ensuing cold front blasted across Ontario in 24 hours, reaching the Longfellow Mountains early on the 3rd. Temperatures fell throughout the day, with wind chills reaching -30 or colder by the afternoon for most locations. Wind chill warning criteria was met at many locations for 12 to 24 hours. Hundreds of warming shelters were opened during the event. While the cold air remained until the 5th, diminishing winds and temperatures climbing back above freezing allowed wind chills to warm above thresholds during the first half of the day on the 4th.  Most areas reported a top 3 coldest wind chill reading on record for this event.

Extreme Cold/Wind Chill in COASTAL CUMBERLAND, MAINE
From 03-FEB-23 18:00:00 to 04-FEB-23 10:00:00 (EST-5)
Reported by: ASOS

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish. This included -45 degrees at the Portland International Jetport, which was the coldest observed wind chill since January of 1971.

Extreme Cold/Wind Chill in SAGADAHOC, MAINE
From 03-FEB-23 18:00:00 to 04-FEB-23 09:00:00 (EST-5)
Reported by: Mesonet

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in LINCOLN, MAINE
From 03-FEB-23 19:00:00 to 04-FEB-23 06:00:00 (EST-5)
Reported by: AWOS

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees, including -37 degrees at Wiscasset Airport, early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in KNOX, MAINE
From 03-FEB-23 17:00:00 to 04-FEB-23 10:00:00 (EST-5)
Reported by: AWOS

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in COASTAL WALDO, MAINE
From 03-FEB-23 16:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees, including -41 degrees at Belfast Municipal Airport, early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in NORTHERN FRANKLIN, MAINE
From 03-FEB-23 10:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By mid morning on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -55 degrees, including -47 degrees at Carrabassett Regional Airport, early on the 4th before winds gradually began to diminish.  The cold temperatures caused all the local ski areas to close for the day due to the dangerous conditions.

Extreme Cold/Wind Chill in NORTHERN OXFORD, MAINE
From 03-FEB-23 10:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By mid morning on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -55 degrees early on the 4th before winds gradually began to diminish.  The cold temperatures caused all the local ski areas to close for the day due to the dangerous conditions.

Extreme Cold/Wind Chill in CENTRAL SOMERSET, MAINE
From 03-FEB-23 07:00:00 to 04-FEB-23 13:00:00 (EST-5)
Reported by: AWOS

By morning on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -60 degrees, including -59 degrees at Newton Field in Jackman, early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in SOUTHERN OXFORD, MAINE
From 03-FEB-23 12:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By midday on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -50 degrees, including -49 degrees at Bethel Regional Airport, early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in SOUTHERN FRANKLIN, MAINE
From 03-FEB-23 12:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By midday on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -50 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in SOUTHERN SOMERSET, MAINE
From 03-FEB-23 12:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By midday on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -50 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in INTERIOR WALDO, MAINE
From 03-FEB-23 16:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: Mesonet

By mid afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in KENNEBEC, MAINE
From 03-FEB-23 16:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: ASOS

By mid afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees, including -46 at Augusta State Airport, early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in ANDROSCOGGIN, MAINE
From 03-FEB-23 16:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By mid afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in CENTRAL INTERIOR CUMBERLAND, MAINE
From 03-FEB-23 16:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: Mesonet

By mid afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in INTERIOR CUMBERLAND HIGHLANDS, MAINE
From 03-FEB-23 14:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: Mesonet

By the afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in INTERIOR YORK, MAINE
From 03-FEB-23 18:00:00 to 04-FEB-23 11:00:00 (EST-5)
Reported by: AWOS

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees, including -43 at Sanford Seacoast Regional Airport, early on the 4th before winds gradually began to diminish.

Extreme Cold/Wind Chill in COASTAL YORK, MAINE
From 03-FEB-23 18:00:00 to 04-FEB-23 10:00:00 (EST-5)
Reported by: Mesonet

By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds gradually began to diminish.