Mackay weather by month
What a typical year looks like in Mackay, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mackay Lost River Rs, 1 km from Mackay; records cover 1908–2026.
The year at a glance
- Precipitation a year
- 9.9 in251 mm
- Snow a year
- Rare
- Last spring freeze
- Jun 9
- First fall freeze
- Sep 14
- Heating degree days
- 8,439
- Cooling degree days
- 172
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Mackay in January
Highs average 30°−1° and lows 8°−13°, with 0.75 in19 mm of precipitation in a typical January.
- Record high
- 56°13° (1918)
- Record low
- −28°−33° (1942)
- Heating degree days
- 1426
- Cooling degree days
- 0
Mackay in February
Highs average 34°1° and lows 12°−11°, with 0.51 in13 mm of precipitation in a typical February.
- Record high
- 67°19° (1924)
- Record low
- −33°−36° (1985)
- Heating degree days
- 1168
- Cooling degree days
- 0
Mackay in March
Highs average 44°7° and lows 22°−6°, with 0.72 in18 mm of precipitation in a typical March.
- Record high
- 78°26° (2026)
- Record low
- −18°−28° (1943)
- Heating degree days
- 997
- Cooling degree days
- 0
Mackay in April
Highs average 55°13° and lows 29°−2°, with 0.88 in22 mm of precipitation in a typical April.
- Record high
- 87°31° (2012)
- Record low
- −7°−22° (1936)
- Heating degree days
- 698
- Cooling degree days
- 0
Mackay in May
Highs average 65°18° and lows 37°3°, with 1.2 in31 mm of precipitation in a typical May.
- Record high
- 96°36° (1919)
- Record low
- 13°−11° (1984)
- Heating degree days
- 441
- Cooling degree days
- 1
Mackay in June
Highs average 73°23° and lows 43°6°, with 1.5 in37 mm of precipitation in a typical June.
- Record high
- 100°38° (1939)
- Record low
- 19°−7° (1985)
- Heating degree days
- 223
- Cooling degree days
- 13
Mackay in July
Highs average 83°29° and lows 50°10°, with 0.65 in17 mm of precipitation in a typical July.
- Record high
- 104°40° (1939)
- Record low
- 27°−3° (1909)
- Heating degree days
- 47
- Cooling degree days
- 95
Mackay in August
Highs average 82°28° and lows 48°9°, with 0.68 in17 mm of precipitation in a typical August.
- Record high
- 103°39° (1939)
- Record low
- 22°−6° (1908)
- Heating degree days
- 67
- Cooling degree days
- 58
Mackay in September
Highs average 72°22° and lows 40°5°, with 0.77 in20 mm of precipitation in a typical September.
- Record high
- 98°37° (1939)
- Record low
- 10°−12° (1985)
- Heating degree days
- 267
- Cooling degree days
- 5
Mackay in OctoberThis month
Highs average 58°14° and lows 31°−1°, with 0.84 in21 mm of precipitation in a typical October.
- Record high
- 85°29° (1918)
- Record low
- −5°−21° (2019)
- Heating degree days
- 643
- Cooling degree days
- 0
Mackay in November
Highs average 41°5° and lows 19°−7°, with 0.53 in13 mm of precipitation in a typical November.
- Record high
- 70°21° (1927)
- Record low
- −17°−27° (1993)
- Heating degree days
- 1044
- Cooling degree days
- 0
Mackay in December
Highs average 29°−2° and lows 10°−12°, with 0.87 in22 mm of precipitation in a typical December.
- Record high
- 58°14° (2025)
- Record low
- −32°−36° (1983)
- Heating degree days
- 1418
- Cooling degree days
- 0