The arrival of a reinforcing arctic front early on February 6th shifted winds to the northwest and allowed for strong cold air advection across the northern ranchlands and brush country. Temperatures fell into the 30s and 40s and remained there during the day on the 6th. As high pressure continued to build south, the core of the coldest air spread across the ranchlands overnight and temperatures plummeted to freezing or below.
The cold air was accompanied by light precipitation during the early to mid morning across portions of the Rio Grande Plains/South Texas Brush Country; colder pockets received a light coating of ice on signs, fences, and high grasses, etc.

Frost/Freeze in STARR, TEXAS
From 07-FEB-14 05:00:00 to 07-FEB-14 07:45:00 (CST-6)
Property damage: 0.00K
Reported by: ASOS

Temperatures fell to or below freezing for almost 3 hours on the morning of February 7th. The COOP site in Rio Grande City recorded a low of 31 degrees.

Frost/Freeze in JIM HOGG, TEXAS
From 06-FEB-14 23:00:00 to 07-FEB-14 11:30:00 (CST-6)
Property damage: 0.00K
Reported by: RAWS

Temperatures fell to or below freezing for a number of hours across Jim Hogg County. The Hebbronville RAWS site reported a low of 30 degrees, while the ASOS site at KHBV reported a low of 31 degrees.  For a second straight day, very light precipitation accompanied the cold and froze on contact with elevated surfaces, including signs, fences, tall grass, and trees/branches.  None accumulated on roads, however.

Frost/Freeze in ZAPATA, TEXAS
From 07-FEB-14 05:00:00 to 07-FEB-14 08:45:00 (CST-6)
Property damage: 0.00K
Reported by: ASOS

Temperatures fell to or below freezing for almost 3 hours on the morning of February 7th. The ASOS site in Zapata recorded a low of 32 degrees, while the COOP site in Escobas reported a low of 30 degrees.  Very light precipitation accompanied the cold during the early to mid morning, with a light coating on signs, fences, high grass, and trees/branches.  There was no impact to roads.

Frost/Freeze in BROOKS, TEXAS
From 07-FEB-14 05:30:00 to 07-FEB-14 08:45:00 (CST-6)
Property damage: 0.00K
Reported by: COOP Observer

Temperatures fell to freezing or just below across Brooks County during the early morning hours of February 7th. The COOP observer in Falfurrias reported a low of 32 degrees.  Based on surrounding observations and reports from officials in the region, very light precipitation accompanied the cold in some of the area, producing a light coating of ice on signs, fences, tall grass, and trees/branches.  There was no impact to roads or the electrical grid.

Frost/Freeze in KENEDY, TEXAS
From 07-FEB-14 06:00:00 to 07-FEB-14 08:45:00 (CST-6)
Property damage: 0.00K
Reported by: COOP Observer

Temperatures fell to or just below freezing for several hours on the morning of February 7th. The COOP observer in Sarita reported a low of 31 degrees, while further south in Armstrong, the COOP observer reported a low of 32 degrees.  Based on nearby observations in Kingsville, a little more than 20 miles north of Sarita, there was likely some very light precipitation that created a coating of ice on signs, fences, tall grass, and trees/branches.  There was no impact to roads, bridges, or the electrical grid.