Hollister weather by month
What a typical year looks like in Hollister, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Twin Falls Sun Valley Regional Airport, 17 km from Hollister; records cover 1997–2026.
The year at a glance
- Precipitation a year
- 10.3 in261 mm
- Snow a year
- Rare
- Last spring freeze
- May 9
- First fall freeze
- Oct 6
- Heating degree days
- 6,387
- Cooling degree days
- 616
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 4°−16° (heating, 99%) and 99°37° (cooling, 1%).
Month by month
Hollister in January
Highs average 37°3° and lows 21°−6°, with 0.95 in24 mm of precipitation in a typical January.
- Record high
- 61°16° (2003)
- Record low
- −15°−26° (2016)
- Heating degree days
- 1114
- Cooling degree days
- 0
Hollister in February
Highs average 42°5° and lows 24°−5°, with 0.68 in17 mm of precipitation in a typical February.
- Record high
- 65°18° (2015)
- Record low
- −4°−20° (2004)
- Heating degree days
- 902
- Cooling degree days
- 0
Hollister in March
Highs average 52°11° and lows 30°−1°, with 0.98 in25 mm of precipitation in a typical March.
- Record high
- 80°27° (2026)
- Record low
- 9°−13° (2022)
- Heating degree days
- 746
- Cooling degree days
- 0
Hollister in April
Highs average 59°15° and lows 34°1°, with 1.1 in29 mm of precipitation in a typical April.
- Record high
- 90°32° (2012)
- Record low
- 19°−7° (2008)
- Heating degree days
- 555
- Cooling degree days
- 0
Hollister in May
Highs average 69°20° and lows 42°6°, with 1.5 in37 mm of precipitation in a typical May.
- Record high
- 100°38° (2003)
- Record low
- 24°−4° (2002)
- Heating degree days
- 311
- Cooling degree days
- 15
Hollister in June
Highs average 78°26° and lows 49°10°, with 0.99 in25 mm of precipitation in a typical June.
- Record high
- 103°39° (2013)
- Record low
- 34°1° (1999)
- Heating degree days
- 110
- Cooling degree days
- 74
Hollister in July
Highs average 88°31° and lows 58°14°, with 0.31 in7.9 mm of precipitation in a typical July.
- Record high
- 107°42° (2003)
- Record low
- 41°5° (1997)
- Heating degree days
- 10
- Cooling degree days
- 259
Hollister in August
Highs average 87°30° and lows 56°13°, with 0.43 in11 mm of precipitation in a typical August.
- Record high
- 103°39° (2024)
- Record low
- 38°3° (1999)
- Heating degree days
- 17
- Cooling degree days
- 212
Hollister in September
Highs average 76°25° and lows 47°8°, with 0.53 in13 mm of precipitation in a typical September.
- Record high
- 102°39° (2022)
- Record low
- 24°−4° (1999)
- Heating degree days
- 151
- Cooling degree days
- 53
Hollister in OctoberThis month
Highs average 62°17° and lows 36°2°, with 0.77 in20 mm of precipitation in a typical October.
- Record high
- 92°33° (2015)
- Record low
- 4°−16° (2002)
- Heating degree days
- 488
- Cooling degree days
- 3
Hollister in November
Highs average 47°8° and lows 26°−3°, with 0.82 in21 mm of precipitation in a typical November.
- Record high
- 76°24° (2006)
- Record low
- −5°−21° (2015)
- Heating degree days
- 852
- Cooling degree days
- 0
Hollister in December
Highs average 37°3° and lows 20°−7°, with 1.2 in31 mm of precipitation in a typical December.
- Record high
- 63°17° (2025)
- Record low
- −12°−24° (2015)
- Heating degree days
- 1131
- Cooling degree days
- 0