Shackle Island weather by month
What a typical year looks like in Shackle Island, Tennessee: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at SPRINGFIELD EXPERIMENT STATION, 23 km from Shackle Island; records cover 1942–2026.
The year at a glance
- Precipitation a year
- 53.3 in1354 mm
- Snow a year
- 6 in15 cm
- Last spring freeze
- Apr 13
- First fall freeze
- Oct 25
- Heating degree days
- 4,028
- Cooling degree days
- 1,544
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 7°−14° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Shackle Island in January
Highs average 45°7° and lows 27°−3°, with 4.3 in108 mm of precipitation and 1.5 in3.8 cm of snow in a typical January.
- Record high
- 77°25° (1943)
- Record low
- −18°−28° (1963)
- Heating degree days
- 894
- Cooling degree days
- 0
Shackle Island in February
Highs average 50°10° and lows 30°−1°, with 4.5 in114 mm of precipitation and 2.4 in6.1 cm of snow in a typical February.
- Record high
- 82°28° (1996)
- Record low
- −13°−25° (1951)
- Heating degree days
- 709
- Cooling degree days
- 0
Shackle Island in March
Highs average 59°15° and lows 37°3°, with 4.8 in122 mm of precipitation and 1.2 in3 cm of snow in a typical March.
- Record high
- 88°31° (2026)
- Record low
- 1°−17° (1960)
- Heating degree days
- 532
- Cooling degree days
- 8
Shackle Island in April
Highs average 69°21° and lows 47°8°, with 5.3 in136 mm of precipitation in a typical April.
- Record high
- 89°32° (2002)
- Record low
- 16°−9° (2007)
- Heating degree days
- 255
- Cooling degree days
- 39
Shackle Island in May
Highs average 77°25° and lows 57°14°, with 5.6 in143 mm of precipitation in a typical May.
- Record high
- 96°36° (1952)
- Record low
- 30°−1° (1976)
- Heating degree days
- 81
- Cooling degree days
- 138
Shackle Island in June
Highs average 85°30° and lows 65°18°, with 4.3 in108 mm of precipitation in a typical June.
- Record high
- 106°41° (2012)
- Record low
- 40°4° (1966)
- Heating degree days
- 6
- Cooling degree days
- 301
Shackle Island in July
Highs average 89°31° and lows 68°20°, with 4.4 in111 mm of precipitation in a typical July.
- Record high
- 106°41° (1952)
- Record low
- 47°8° (1947)
- Heating degree days
- 0
- Cooling degree days
- 416
Shackle Island in August
Highs average 88°31° and lows 66°19°, with 3.7 in94 mm of precipitation in a typical August.
- Record high
- 106°41° (2007)
- Record low
- 42°6° (1946)
- Heating degree days
- 1
- Cooling degree days
- 379
Shackle Island in September
Highs average 82°28° and lows 60°15°, with 3.8 in96 mm of precipitation in a typical September.
- Record high
- 104°40° (1954)
- Record low
- 31°−1° (2001)
- Heating degree days
- 33
- Cooling degree days
- 210
Shackle Island in OctoberThis month
Highs average 71°22° and lows 48°9°, with 4.2 in106 mm of precipitation in a typical October.
- Record high
- 97°36° (2019)
- Record low
- 22°−6° (1976)
- Heating degree days
- 223
- Cooling degree days
- 48
Shackle Island in November
Highs average 59°15° and lows 38°3°, with 3.8 in96 mm of precipitation in a typical November.
- Record high
- 87°31° (2016)
- Record low
- −5°−21° (1950)
- Heating degree days
- 509
- Cooling degree days
- 5
Shackle Island in December
Highs average 49°9° and lows 31°−1°, with 4.7 in120 mm of precipitation and 0.7 in1.8 cm of snow in a typical December.
- Record high
- 77°25° (1951)
- Record low
- −16°−27° (1989)
- Heating degree days
- 785
- Cooling degree days
- 0