Arimo weather by month
What a typical year looks like in Arimo, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Downey, 15 km from Arimo; records cover 1895–2026.
The year at a glance
- Precipitation a year
- 15.6 in397 mm
- Snow a year
- Rare
- Last spring freeze
- May 23
- First fall freeze
- Sep 23
- Heating degree days
- 7,392
- Cooling degree days
- 352
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −3°−19° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Arimo in January
Highs average 32°0° and lows 14°−10°, with 1.1 in27 mm of precipitation in a typical January.
- Record high
- 51°11° (2018)
- Record low
- −30°−34° (1898)
- Heating degree days
- 1294
- Cooling degree days
- 0
Arimo in February
Highs average 37°3° and lows 18°−8°, with 1.1 in27 mm of precipitation in a typical February.
- Record high
- 61°16° (2015)
- Record low
- −32°−36° (1899)
- Heating degree days
- 1060
- Cooling degree days
- 0
Arimo in March
Highs average 48°9° and lows 25°−4°, with 1.5 in38 mm of precipitation in a typical March.
- Record high
- 78°26° (2026)
- Record low
- −13°−25° (1897)
- Heating degree days
- 890
- Cooling degree days
- 0
Arimo in April
Highs average 58°14° and lows 31°−1°, with 1.5 in39 mm of precipitation in a typical April.
- Record high
- 80°27° (1902)
- Record low
- 14°−10° (1896)
- Heating degree days
- 618
- Cooling degree days
- 0
Arimo in May
Highs average 67°19° and lows 38°3°, with 2.3 in58 mm of precipitation in a typical May.
- Record high
- 92°33° (2020)
- Record low
- 10°−12° (1899)
- Heating degree days
- 386
- Cooling degree days
- 1
Arimo in June
Highs average 78°26° and lows 44°7°, with 1.3 in33 mm of precipitation in a typical June.
- Record high
- 100°38° (2015)
- Record low
- 19°−7° (1899)
- Heating degree days
- 154
- Cooling degree days
- 30
Arimo in July
Highs average 89°31° and lows 51°11°, with 0.96 in24 mm of precipitation in a typical July.
- Record high
- 105°41° (2026)
- Record low
- 29°−2° (1898)
- Heating degree days
- 21
- Cooling degree days
- 170
Arimo in August
Highs average 88°31° and lows 49°9°, with 1 in26 mm of precipitation in a typical August.
- Record high
- 103°39° (2026)
- Record low
- 19°−7° (1899)
- Heating degree days
- 26
- Cooling degree days
- 129
Arimo in September
Highs average 77°25° and lows 41°5°, with 1.4 in37 mm of precipitation in a typical September.
- Record high
- 99°37° (2022)
- Record low
- 17°−8° (1902)
- Heating degree days
- 206
- Cooling degree days
- 22
Arimo in OctoberThis month
Highs average 62°17° and lows 31°0°, with 1.3 in33 mm of precipitation in a typical October.
- Record high
- 86°30° (2026)
- Record low
- −2°−19° (2019)
- Heating degree days
- 576
- Cooling degree days
- 0
Arimo in November
Highs average 46°8° and lows 23°−5°, with 1.1 in27 mm of precipitation in a typical November.
- Record high
- 72°22° (2020)
- Record low
- −4°−20° (2015)
- Heating degree days
- 918
- Cooling degree days
- 0
Arimo in December
Highs average 34°1° and lows 16°−9°, with 1.1 in27 mm of precipitation in a typical December.
- Record high
- 58°14° (2014)
- Record low
- −22°−30° (1898)
- Heating degree days
- 1243
- Cooling degree days
- 0