Twin Falls weather by month
What a typical year looks like in Twin Falls, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at JEROME, 19 km from Twin Falls; records cover 1915–2026.
The year at a glance
- Precipitation a year
- 10.5 in265 mm
- Snow a year
- Rare
- Last spring freeze
- May 4
- First fall freeze
- Oct 7
- Heating degree days
- 6,176
- Cooling degree days
- 776
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 2°−17° (heating, 99%) and 102°39° (cooling, 1%).
Month by month
Twin Falls in January
Highs average 36°2° and lows 22°−6°, with 1.4 in35 mm of precipitation in a typical January.
- Record high
- 61°16° (1953)
- Record low
- −25°−32° (1937)
- Heating degree days
- 1127
- Cooling degree days
- 0
Twin Falls in February
Highs average 41°5° and lows 25°−4°, with 0.82 in21 mm of precipitation in a typical February.
- Record high
- 69°21° (1981)
- Record low
- −24°−31° (1933)
- Heating degree days
- 894
- Cooling degree days
- 0
Twin Falls in March
Highs average 52°11° and lows 31°−1°, with 1.1 in27 mm of precipitation in a typical March.
- Record high
- 80°27° (2004)
- Record low
- −1°−18° (1993)
- Heating degree days
- 738
- Cooling degree days
- 0
Twin Falls in April
Highs average 60°15° and lows 36°2°, with 1 in26 mm of precipitation in a typical April.
- Record high
- 91°33° (2012)
- Record low
- 12°−11° (1936)
- Heating degree days
- 517
- Cooling degree days
- 1
Twin Falls in May
Highs average 70°21° and lows 44°7°, with 1.3 in34 mm of precipitation in a typical May.
- Record high
- 103°39° (2003)
- Record low
- 19°−7° (1953)
- Heating degree days
- 270
- Cooling degree days
- 22
Twin Falls in June
Highs average 79°26° and lows 52°11°, with 0.61 in15 mm of precipitation in a typical June.
- Record high
- 110°43° (1940)
- Record low
- 22°−6° (2004)
- Heating degree days
- 93
- Cooling degree days
- 109
Twin Falls in July
Highs average 90°32° and lows 59°15°, with 0.13 in3.3 mm of precipitation in a typical July.
- Record high
- 110°43° (2003)
- Record low
- 35°2° (1983)
- Heating degree days
- 10
- Cooling degree days
- 312
Twin Falls in August
Highs average 89°31° and lows 57°14°, with 0.25 in6.4 mm of precipitation in a typical August.
- Record high
- 107°42° (1940)
- Record low
- 32°0° (2008)
- Heating degree days
- 14
- Cooling degree days
- 258
Twin Falls in September
Highs average 78°26° and lows 48°9°, with 0.43 in11 mm of precipitation in a typical September.
- Record high
- 102°39° (1955)
- Record low
- 21°−6° (1926)
- Heating degree days
- 124
- Cooling degree days
- 70
Twin Falls in OctoberThis month
Highs average 63°17° and lows 38°3°, with 0.89 in23 mm of precipitation in a typical October.
- Record high
- 94°34° (1992)
- Record low
- 11°−12° (2002)
- Heating degree days
- 453
- Cooling degree days
- 4
Twin Falls in November
Highs average 47°8° and lows 28°−2°, with 1 in26 mm of precipitation in a typical November.
- Record high
- 78°26° (1999)
- Record low
- −10°−23° (1955)
- Heating degree days
- 816
- Cooling degree days
- 0
Twin Falls in December
Highs average 36°2° and lows 22°−5°, with 1.5 in38 mm of precipitation in a typical December.
- Record high
- 67°19° (1939)
- Record low
- −24°−31° (1990)
- Heating degree days
- 1120
- Cooling degree days
- 0