Salmon weather by month
What a typical year looks like in Salmon, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Salmon-Ksra, 1 km from Salmon; records cover 1905–2026.
The year at a glance
- Precipitation a year
- 9.5 in241 mm
- Snow a year
- 22 in56 cm
- Last spring freeze
- May 12
- First fall freeze
- Sep 25
- Heating degree days
- 7,765
- Cooling degree days
- 293
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −6°−21° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Salmon in January
Highs average 28°−2° and lows 11°−12°, with 0.58 in15 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 62°17° (1953)
- Record low
- −37°−38° (1930)
- Heating degree days
- 1407
- Cooling degree days
- 0
Salmon in February
Highs average 36°2° and lows 16°−9°, with 0.37 in9.4 mm of precipitation and 4 in10 cm of snow in a typical February.
- Record high
- 68°20° (1950)
- Record low
- −35°−37° (1956)
- Heating degree days
- 1091
- Cooling degree days
- 0
Salmon in March
Highs average 50°10° and lows 26°−4°, with 0.47 in12 mm of precipitation and 1.2 in3 cm of snow in a typical March.
- Record high
- 80°27° (2026)
- Record low
- −20°−29° (1960)
- Heating degree days
- 853
- Cooling degree days
- 0
Salmon in April
Highs average 59°15° and lows 32°0°, with 0.77 in20 mm of precipitation and 0.4 in1 cm of snow in a typical April.
- Record high
- 89°32° (1946)
- Record low
- 2°−17° (1936)
- Heating degree days
- 596
- Cooling degree days
- 0
Salmon in May
Highs average 68°20° and lows 40°4°, with 1.3 in33 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 96°36° (1934)
- Record low
- 16°−9° (1913)
- Heating degree days
- 344
- Cooling degree days
- 3
Salmon in June
Highs average 76°24° and lows 46°8°, with 1.6 in41 mm of precipitation in a typical June.
- Record high
- 103°39° (1974)
- Record low
- 20°−7° (2022)
- Heating degree days
- 156
- Cooling degree days
- 35
Salmon in July
Highs average 86°30° and lows 52°11°, with 0.77 in20 mm of precipitation in a typical July.
- Record high
- 106°41° (1936)
- Record low
- 26°−3° (1955)
- Heating degree days
- 26
- Cooling degree days
- 148
Salmon in August
Highs average 85°29° and lows 49°9°, with 0.6 in15 mm of precipitation in a typical August.
- Record high
- 103°39° (1928)
- Record low
- 22°−6° (1910)
- Heating degree days
- 43
- Cooling degree days
- 97
Salmon in September
Highs average 74°24° and lows 41°5°, with 0.79 in20 mm of precipitation in a typical September.
- Record high
- 99°37° (1950)
- Record low
- 13°−11° (1926)
- Heating degree days
- 236
- Cooling degree days
- 10
Salmon in OctoberThis month
Highs average 58°15° and lows 31°−1°, with 0.81 in21 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 87°31° (1920)
- Record low
- −3°−19° (2019)
- Heating degree days
- 632
- Cooling degree days
- 0
Salmon in November
Highs average 41°5° and lows 22°−6°, with 0.67 in17 mm of precipitation and 3 in8 cm of snow in a typical November.
- Record high
- 78°26° (1924)
- Record low
- −14°−26° (1931)
- Heating degree days
- 1014
- Cooling degree days
- 0
Salmon in December
Highs average 29°−2° and lows 13°−11°, with 0.73 in19 mm of precipitation and 6 in16 cm of snow in a typical December.
- Record high
- 62°17° (1917)
- Record low
- −32°−36° (1919)
- Heating degree days
- 1367
- Cooling degree days
- 0