Challis weather by month
What a typical year looks like in Challis, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Challis Airport, 2 km from Challis; records cover 1998–2026.
The year at a glance
- Precipitation a year
- 6.9 in176 mm
- Snow a year
- Rare
- Last spring freeze
- May 25
- First fall freeze
- Sep 17
- Heating degree days
- 7,793
- Cooling degree days
- 312
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −10°−23° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Challis in January
Highs average 29°−2° and lows 11°−12°, with 0.41 in10 mm of precipitation in a typical January.
- Record high
- 56°13° (2003)
- Record low
- −32°−36° (2017)
- Heating degree days
- 1396
- Cooling degree days
- 0
Challis in February
Highs average 37°3° and lows 17°−8°, with 0.36 in9.1 mm of precipitation in a typical February.
- Record high
- 61°16° (2015)
- Record low
- −18°−28° (2025)
- Heating degree days
- 1068
- Cooling degree days
- 0
Challis in March
Highs average 49°10° and lows 26°−4°, with 0.46 in12 mm of precipitation in a typical March.
- Record high
- 75°24° (2026)
- Record low
- −2°−19° (2002)
- Heating degree days
- 857
- Cooling degree days
- 0
Challis in April
Highs average 57°14° and lows 31°0°, with 0.52 in13 mm of precipitation in a typical April.
- Record high
- 83°28° (2012)
- Record low
- 11°−12° (2008)
- Heating degree days
- 630
- Cooling degree days
- 0
Challis in May
Highs average 67°19° and lows 40°4°, with 0.93 in24 mm of precipitation in a typical May.
- Record high
- 96°36° (2003)
- Record low
- 20°−7° (2002)
- Heating degree days
- 363
- Cooling degree days
- 4
Challis in June
Highs average 76°24° and lows 46°8°, with 0.93 in24 mm of precipitation in a typical June.
- Record high
- 100°38° (2015)
- Record low
- 29°−2° (2012)
- Heating degree days
- 154
- Cooling degree days
- 32
Challis in July
Highs average 87°31° and lows 52°11°, with 0.42 in11 mm of precipitation in a typical July.
- Record high
- 103°39° (2002)
- Record low
- 36°2° (1999)
- Heating degree days
- 19
- Cooling degree days
- 152
Challis in August
Highs average 85°29° and lows 50°10°, with 0.45 in11 mm of precipitation in a typical August.
- Record high
- 102°39° (2018)
- Record low
- 33°1° (2006)
- Heating degree days
- 36
- Cooling degree days
- 110
Challis in September
Highs average 75°24° and lows 42°6°, with 0.85 in22 mm of precipitation in a typical September.
- Record high
- 99°37° (2022)
- Record low
- 19°−7° (1999)
- Heating degree days
- 217
- Cooling degree days
- 14
Challis in OctoberThis month
Highs average 59°15° and lows 32°0°, with 0.56 in14 mm of precipitation in a typical October.
- Record high
- 84°29° (2010)
- Record low
- −4°−20° (2002)
- Heating degree days
- 618
- Cooling degree days
- 0
Challis in November
Highs average 41°5° and lows 21°−6°, with 0.52 in13 mm of precipitation in a typical November.
- Record high
- 72°22° (2006)
- Record low
- −12°−24° (2014)
- Heating degree days
- 1034
- Cooling degree days
- 0
Challis in December
Highs average 29°−2° and lows 11°−12°, with 0.52 in13 mm of precipitation in a typical December.
- Record high
- 63°17° (2021)
- Record low
- −23°−31° (2016)
- Heating degree days
- 1401
- Cooling degree days
- 0