A frigid Arctic air mass moved into Oregon December 5th and remained over the area through December 12th, when it finally abated as a Pacific system approached the area.

Extreme Cold/Wind Chill in SISKIYOU MOUNTAINS & SOUTHERN OREGON CASCADES, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the single digits above zero.  On the coldest nights...the 8th through the 10th, the coldest stations dipped below zero.  The coldest stations had lows ranging from 15 to 26 degrees below zero.  Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in CENTRAL & EASTERN LAKE COUNTY, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the single digits above zero.  On the coldest nights...the 8th through the 10th, the coldest stations dipped below zero.  The coldest stations had lows ranging from 15 to 26 degrees below zero.  Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in KLAMATH BASIN, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the single digits above zero.  On the coldest nights...the 8th through the 10th, the coldest stations dipped below zero.  The coldest stations had lows ranging from 15 to 26 degrees below zero.  Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in NORTHERN & EASTERN KLAMATH COUNTY & WESTERN LAKE COUNTY, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the single digits above zero.  On the coldest nights...the 8th through the 10th, the coldest stations dipped below zero.  The coldest stations had lows ranging from 15 to 26 degrees below zero.  Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in SOUTH CENTRAL OREGON CASCADES, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the single digits above zero.  On the coldest nights...the 8th through the 10th, the coldest stations dipped below zero.  The coldest stations had lows ranging from 15 to 26 degrees below zero.  Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in JACKSON COUNTY, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the teens.  On the coldest nights...the 9th and the 10th, the coldest stations dipped into the single digits.
Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.  On the night of 12/08, a homeless man in Medford apparently froze to death.

Extreme Cold/Wind Chill in EASTERN DOUGLAS COUNTY FOOTHILLS, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the teens.  On the coldest nights...the 9th and the 10th, the coldest stations dipped into the single digits.
Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in CENTRAL DOUGLAS COUNTY, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the teens.  On the coldest nights...the 9th and the 10th, the coldest stations dipped into the single digits.
Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.

Extreme Cold/Wind Chill in EASTERN CURRY COUNTY & JOSEPHINE COUNTY, OREGON
From 05-DEC-09 18:00:00 to 11-DEC-09 10:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Low temperatures in this zone during this interval were generally in the teens.  On the coldest nights...the 9th and the 10th, the coldest stations dipped into the single digits.
Temperatures warmed on the 11th but remained well below normal...and became more seasonable on the 12th.  Numerous broken pipes and other cold-related damage was reported during this interval.