Mercedes weather by month
What a typical year looks like in Mercedes, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at HARLINGEN, 25 km from Mercedes; records cover 1912–2026.
The year at a glance
- Precipitation a year
- 28.2 in716 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 17
- First fall freeze
- Rare
- Heating degree days
- 543
- Cooling degree days
- 4,438
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 36°2° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Mercedes in January
Highs average 72°22° and lows 51°11°, with 1.2 in31 mm of precipitation in a typical January.
- Record high
- 93°34° (2002)
- Record low
- 14°−10° (1962)
- Heating degree days
- 179
- Cooling degree days
- 68
Mercedes in February
Highs average 76°24° and lows 55°13°, with 1.2 in30 mm of precipitation in a typical February.
- Record high
- 99°37° (1940)
- Record low
- 21°−6° (1951)
- Heating degree days
- 97
- Cooling degree days
- 108
Mercedes in March
Highs average 81°27° and lows 60°16°, with 1.5 in38 mm of precipitation in a typical March.
- Record high
- 104°40° (1984)
- Record low
- 29°−2° (1922)
- Heating degree days
- 42
- Cooling degree days
- 213
Mercedes in April
Highs average 86°30° and lows 66°19°, with 2.3 in58 mm of precipitation in a typical April.
- Record high
- 107°42° (1920)
- Record low
- 37°3° (1938)
- Heating degree days
- 8
- Cooling degree days
- 342
Mercedes in May
Highs average 91°33° and lows 72°22°, with 2.7 in69 mm of precipitation in a typical May.
- Record high
- 107°42° (2024)
- Record low
- 46°8° (1925)
- Heating degree days
- 0
- Cooling degree days
- 510
Mercedes in June
Highs average 95°35° and lows 76°24°, with 2.4 in60 mm of precipitation in a typical June.
- Record high
- 106°41° (1956)
- Record low
- 57°14° (1984)
- Heating degree days
- 0
- Cooling degree days
- 619
Mercedes in July
Highs average 97°36° and lows 77°25°, with 2.4 in62 mm of precipitation in a typical July.
- Record high
- 107°42° (1939)
- Record low
- 60°16° (1963)
- Heating degree days
- 0
- Cooling degree days
- 674
Mercedes in August
Highs average 98°37° and lows 77°25°, with 2.1 in53 mm of precipitation in a typical August.
- Record high
- 108°42° (1915)
- Record low
- 60°16° (1967)
- Heating degree days
- 0
- Cooling degree days
- 691
Mercedes in September
Highs average 93°34° and lows 74°23°, with 5.8 in146 mm of precipitation in a typical September.
- Record high
- 106°41° (1947)
- Record low
- 52°11° (1924)
- Heating degree days
- 0
- Cooling degree days
- 551
Mercedes in OctoberThis month
Highs average 88°31° and lows 67°19°, with 3.1 in78 mm of precipitation in a typical October.
- Record high
- 100°38° (1931)
- Record low
- 33°1° (1993)
- Heating degree days
- 5
- Cooling degree days
- 389
Mercedes in November
Highs average 80°27° and lows 59°15°, with 2 in51 mm of precipitation in a typical November.
- Record high
- 97°36° (1927)
- Record low
- 29°−2° (1969)
- Heating degree days
- 55
- Cooling degree days
- 183
Mercedes in December
Highs average 73°23° and lows 53°11°, with 1.6 in40 mm of precipitation and 0.1 in0.3 cm of snow in a typical December.
- Record high
- 93°34° (1921)
- Record low
- 15°−9° (1989)
- Heating degree days
- 157
- Cooling degree days
- 90