High pressure building in behind a cold front allowed for clearing skies and drier air to settle in over Deep South Texas, leading to temperatures falling below freezing across much of the interior Rio Grande Valley, Rio Grande Plains, and Brush Country.

Frost/Freeze in ZAPATA, TEXAS
From 01-DEC-20 01:00:00 to 01-DEC-20 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Low temperatures fell to or below 32 degrees at 1:00 AM and continued through 8:00 AM. Minimum temperatures fell to the upper 20s, with 28 degrees as the measured low at Zapata airport.

Frost/Freeze in STARR, TEXAS
From 01-DEC-20 00:00:00 to 01-DEC-20 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Low temperatures fell to or below 32 degrees at 12:00 AM and continued through 9:00 AM. Minimum temperatures fell to the middle and upper 20s, with 29 degrees measured at the Falcon Lake RAWS site and 26 degrees at the Rancho Los Comitas COOP site.

Frost/Freeze in BROOKS, TEXAS
From 01-DEC-20 00:00:00 to 01-DEC-20 08:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures fell to or below 32 degrees at 12:00 AM and continued through 8:30 AM. Minimum temperatures fell to the middle and upper 20s, ranging from 25 degrees measured at the La Rucia Mesonet to 28 degrees at Brooks County Airport.

Frost/Freeze in JIM HOGG, TEXAS
From 01-DEC-20 01:00:00 to 01-DEC-20 08:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

While the Hebbronville airport only measured a minimum temperature of 33 degrees, several other COOP/Mesonet/RAWS sites in surrounding counties measured minimum temperatures in the upper 20s (28 at Zapata Airport, 26 at the Rancho Los Comitas COOP site in Starr County, and 25 at the La Rucia Mesonet in Brooks County). Given the observed temperatures at these proxy sites and the likelihood of rural ranchland seeing temperatures falling below freezing, it is implied that much of central and southern Jim Hogg county experienced a light freeze on the morning of December 1st. The estimated timing of freezing temperatures is from 1:00 AM to 8:30 AM.

Frost/Freeze in NORTHERN HIDALGO COUNTY, TEXAS
From 01-DEC-20 00:00:00 to 01-DEC-20 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Low temperatures fell to or below 32 degrees at 12:00 AM and continued through 9:00 AM. Minimum temperatures fell to the middle and upper 20s, with 25 degrees as the measured low at the Linn-San Manuel RAWS site. The San Manuel COOP site also recorded a minimum temperature of 28 degrees.

Frost/Freeze in SOUTHERN HIDALGO COUNTY, TEXAS
From 01-DEC-20 02:30:00 to 01-DEC-20 08:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Low temperatures fell to or below 32 degrees at 2:30 AM and continued through 8:00 AM. Edinburg International Airport recorded a minimum temperature of 32 degrees. Given the minimum temperatures simultaneously recorded in adjacent Starr County, it can be implied that additional northwestern portions of Southern Hidalgo also experienced temperatures below freezing.

Frost/Freeze in WILLACY, TEXAS
From 01-DEC-20 02:30:00 to 01-DEC-20 08:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures fell to or below 32 degrees at 2:30 AM and continued through 8:30 AM. Minimum temperatures fell to the upper 20s, with 27 degrees recorded as the minimum temperature at the YTURIA Union Pacific Railroad Mesonet site. The Raymondville COOP site also recorded a minimum temperature of 32 degrees.

Frost/Freeze in INLAND KENEDY COUNTY, TEXAS
From 01-DEC-20 00:00:00 to 01-DEC-20 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures fell to or below 32 degrees at 12:00 AM and continued through 9:00 AM. Minimum temperatures ranged from the middle 20s to lower 30s across Inland Kenedy County. Readings of 26 degrees were recorded at the Sarita Union Pacific Railroad (UPR) Mesonet, 28 at the Armstrong COOP site, and 31 degrees at the ARMSTR UPR Mesonet.