Grangeville weather by month
What a typical year looks like in Grangeville, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Grangeville, 1 km from Grangeville; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 23.5 in597 mm
- Snow a year
- 39 in98 cm
- Last spring freeze
- May 12
- First fall freeze
- Oct 2
- Heating degree days
- 6,675
- Cooling degree days
- 313
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 5°−15° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Grangeville in January
Highs average 38°3° and lows 25°−4°, with 1.3 in32 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 62°17° (1971)
- Record low
- −24°−31° (1937)
- Heating degree days
- 1049
- Cooling degree days
- 0
Grangeville in February
Highs average 42°6° and lows 25°−4°, with 1.4 in36 mm of precipitation and 6 in16 cm of snow in a typical February.
- Record high
- 69°21° (1986)
- Record low
- −24°−31° (1933)
- Heating degree days
- 876
- Cooling degree days
- 0
Grangeville in March
Highs average 49°10° and lows 29°−1°, with 2.3 in59 mm of precipitation and 6 in15 cm of snow in a typical March.
- Record high
- 78°26° (1978)
- Record low
- −9°−23° (1955)
- Heating degree days
- 795
- Cooling degree days
- 0
Grangeville in April
Highs average 56°13° and lows 34°1°, with 2.9 in74 mm of precipitation and 3 in8 cm of snow in a typical April.
- Record high
- 88°31° (1977)
- Record low
- 11°−12° (1936)
- Heating degree days
- 597
- Cooling degree days
- 0
Grangeville in May
Highs average 64°18° and lows 42°5°, with 3.4 in87 mm of precipitation and 0.2 in0.5 cm of snow in a typical May.
- Record high
- 96°36° (1928)
- Record low
- 19°−7° (1954)
- Heating degree days
- 385
- Cooling degree days
- 4
Grangeville in June
Highs average 70°21° and lows 48°9°, with 3.3 in83 mm of precipitation in a typical June.
- Record high
- 98°37° (1939)
- Record low
- 27°−3° (1942)
- Heating degree days
- 202
- Cooling degree days
- 19
Grangeville in July
Highs average 82°28° and lows 54°12°, with 1.1 in27 mm of precipitation in a typical July.
- Record high
- 108°42° (1934)
- Record low
- 33°1° (1955)
- Heating degree days
- 44
- Cooling degree days
- 133
Grangeville in August
Highs average 83°28° and lows 53°12°, with 0.9 in23 mm of precipitation in a typical August.
- Record high
- 106°41° (1961)
- Record low
- 29°−2° (1992)
- Heating degree days
- 46
- Cooling degree days
- 130
Grangeville in September
Highs average 73°23° and lows 45°7°, with 1.3 in33 mm of precipitation in a typical September.
- Record high
- 104°40° (1950)
- Record low
- 19°−7° (1983)
- Heating degree days
- 210
- Cooling degree days
- 27
Grangeville in OctoberThis month
Highs average 58°14° and lows 37°3°, with 1.9 in49 mm of precipitation and 0.6 in1.5 cm of snow in a typical October.
- Record high
- 87°31° (1963)
- Record low
- 0°−18° (1971)
- Heating degree days
- 557
- Cooling degree days
- 0
Grangeville in November
Highs average 45°7° and lows 29°−2°, with 1.9 in49 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 72°22° (1999)
- Record low
- −17°−27° (1955)
- Heating degree days
- 840
- Cooling degree days
- 0
Grangeville in December
Highs average 37°3° and lows 24°−5°, with 1.8 in45 mm of precipitation and 10 in24 cm of snow in a typical December.
- Record high
- 66°19° (1939)
- Record low
- −25°−32° (1968)
- Heating degree days
- 1074
- Cooling degree days
- 0