Summertown weather by month
What a typical year looks like in Summertown, Tennessee: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mount Pleasant 1n, 17 km from Summertown; records cover 1953–2026.
The year at a glance
- Precipitation a year
- 62.2 in1581 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 1
- First fall freeze
- Oct 29
- Heating degree days
- 3,739
- Cooling degree days
- 1,729
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 12°−11° (heating, 99%) and 99°37° (cooling, 1%).
Month by month
Summertown in January
Highs average 47°8° and lows 27°−3°, with 5.3 in133 mm of precipitation in a typical January.
- Record high
- 77°25° (2022)
- Record low
- −17°−27° (1985)
- Heating degree days
- 862
- Cooling degree days
- 0
Summertown in February
Highs average 52°11° and lows 31°0°, with 5.1 in131 mm of precipitation in a typical February.
- Record high
- 84°29° (1962)
- Record low
- −8°−22° (2009)
- Heating degree days
- 651
- Cooling degree days
- 1
Summertown in March
Highs average 61°16° and lows 38°4°, with 6 in152 mm of precipitation in a typical March.
- Record high
- 87°31° (1963)
- Record low
- 5°−15° (1980)
- Heating degree days
- 476
- Cooling degree days
- 7
Summertown in April
Highs average 72°22° and lows 47°9°, with 5.4 in138 mm of precipitation in a typical April.
- Record high
- 93°34° (1965)
- Record low
- 20°−7° (2007)
- Heating degree days
- 210
- Cooling degree days
- 45
Summertown in May
Highs average 80°27° and lows 58°15°, with 6.3 in159 mm of precipitation in a typical May.
- Record high
- 99°37° (2004)
- Record low
- 31°−1° (1963)
- Heating degree days
- 52
- Cooling degree days
- 180
Summertown in June
Highs average 88°31° and lows 67°19°, with 5.4 in137 mm of precipitation in a typical June.
- Record high
- 107°42° (2012)
- Record low
- 38°3° (1966)
- Heating degree days
- 1
- Cooling degree days
- 366
Summertown in July
Highs average 91°33° and lows 69°21°, with 4.8 in121 mm of precipitation in a typical July.
- Record high
- 105°41° (1954)
- Record low
- 47°8° (1972)
- Heating degree days
- 0
- Cooling degree days
- 460
Summertown in August
Highs average 90°32° and lows 66°19°, with 4 in101 mm of precipitation in a typical August.
- Record high
- 106°41° (2007)
- Record low
- 44°7° (1986)
- Heating degree days
- 0
- Cooling degree days
- 403
Summertown in September
Highs average 84°29° and lows 59°15°, with 5.3 in136 mm of precipitation in a typical September.
- Record high
- 105°41° (1954)
- Record low
- 33°1° (1967)
- Heating degree days
- 22
- Cooling degree days
- 216
Summertown in OctoberThis month
Highs average 73°23° and lows 47°8°, with 3.9 in99 mm of precipitation in a typical October.
- Record high
- 97°36° (2019)
- Record low
- 23°−5° (1961)
- Heating degree days
- 216
- Cooling degree days
- 47
Summertown in November
Highs average 61°16° and lows 36°2°, with 4.3 in108 mm of precipitation in a typical November.
- Record high
- 85°29° (1984)
- Record low
- 9°−13° (1976)
- Heating degree days
- 491
- Cooling degree days
- 3
Summertown in December
Highs average 51°11° and lows 30°−1°, with 6.5 in166 mm of precipitation in a typical December.
- Record high
- 76°24° (1956)
- Record low
- −10°−23° (1989)
- Heating degree days
- 758
- Cooling degree days
- 1