A very dry airmass was in place over most of Texas and northern Mexico on the morning of December 25th, 2020. The dry air and clear skies allowed for very efficient radiational cooling to occur through the early morning hours, which resulted in many locations falling to and below the freezing mark for the third time of the month.

Frost/Freeze in STARR, TEXAS
From 24-DEC-20 21:00:00 to 25-DEC-20 08:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Low temperatures fell to or below 32 degrees at 9:00 PM on December 24th and continued through 8:30 AM on the 25th. Minimum temperatures fell to the middle to upper 20s, with 24 degrees as the measured low at the Falcon Lake RAWS site. The Ranco Los Comitas COOP site also reported a minimum temperature of 28 degrees.

Freezing Fog in ZAPATA, TEXAS
From 24-DEC-20 22:30:00 to 25-DEC-20 08:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Low temperatures fell to or below 32 degrees at 10:30 PM on December 24th and continued through 8:45 AM on the 25th. Minimum temperatures fell to the middle 20s, with 26 degrees as the measured low at Zapata Airport.

Frost/Freeze in SOUTHERN HIDALGO COUNTY, TEXAS
From 25-DEC-20 04:00:00 to 25-DEC-20 06:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Low temperatures fell to or below 32 degrees at 4:00 AM and continued through 6:15 AM. Minimum temperatures fell to the lower 30s, with 31 degrees as the measured low at Edinburg International Airport. The La Joya CWOP site also reported a low temperature of 31 degrees.

Frost/Freeze in WILLACY, TEXAS
From 25-DEC-20 02:00:00 to 25-DEC-20 07:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures fell to or below 32 degrees at 2:00 AM and continued through 7:30 AM. Minimum temperatures fell to the upper 20s and lower 30s, with 29 degrees as the measured low at the YTURIA Union Pacific Mesonet site.

Frost/Freeze in INLAND KENEDY COUNTY, TEXAS
From 24-DEC-20 23:30:00 to 25-DEC-20 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Low temperatures fell to or below 32 degrees at 11:30 PM on December 24th and continued through 9:00 AM on the 25th. Minimum temperatures fell to the upper 20s and lower 30s, with 28 degrees as the measured low at the Armstrong COOP site. The ARMSTR Union Pacific Railroad mesonet site also recorded a low temperature of 32 degrees.

Frost/Freeze in BROOKS, TEXAS
From 24-DEC-20 23:00:00 to 25-DEC-20 08:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Low temperatures fell to or below 32 degrees at 11:00 PM on December 24th and continued through 8:15 AM on the 25th. Minimum temperatures fell to the upper 20s and lower 30s, with 27 degrees as the measured low at the Brooks County Airport. The Calosa 1 Mesonet site also recorded a minimum temperature of 29 degrees, while the La Rucia Mesonet recorded a low of 30 degrees.

Frost/Freeze in NORTHERN HIDALGO COUNTY, TEXAS
From 24-DEC-20 20:45:00 to 25-DEC-20 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Low temperatures fell to or below 32 degrees at 8:45 PM on December 24th and continued through 9:00 AM on the 25th. Minimum temperatures ranged from the lower 20s to lower 30s, with 22 degrees as the measured low at the Linn-San Manuel RAWS site. The San Manuel COOP site also recorded a minimum temperature of 26 degrees, while the USCRN Site 17 miles NNE of Edinburg reported a low of 30 degrees.

Frost/Freeze in JIM HOGG, TEXAS
From 25-DEC-20 01:30:00 to 25-DEC-20 08:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

While the Hebbronville airport only reported a minimum temperature of 34 degrees, several surrounding observation sites reported lows in the middle to upper 20s. Given the reported low temperatures at the Rancho Los Comitas site in Starr County (28 degrees), the Zapata Airport (26 degrees), as well as the Calosa 1 Mesonet site in Brooks County (29 degrees), it is implied that central and southern Jim Hogg county also saw temperatures fall below freezing. The estimated timing of freezing temperatures is 1:30 AM to 8:30 AM.