St. Maries weather by month
What a typical year looks like in St. Maries, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Saint Maries, 1 km from St. Maries; records cover 1897–2026.
The year at a glance
- Precipitation a year
- 31.1 in790 mm
- Snow a year
- 56 in142 cm
- Last spring freeze
- May 9
- First fall freeze
- Sep 30
- Heating degree days
- 6,553
- Cooling degree days
- 331
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 4°−16° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
St. Maries in January
Highs average 37°3° and lows 24°−4°, with 4.4 in112 mm of precipitation and 16 in41 cm of snow in a typical January.
- Record high
- 59°15° (1919)
- Record low
- −26°−32° (1937)
- Heating degree days
- 1071
- Cooling degree days
- 0
St. Maries in February
Highs average 42°5° and lows 25°−4°, with 3 in76 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 67°19° (1905)
- Record low
- −23°−31° (1950)
- Heating degree days
- 886
- Cooling degree days
- 0
St. Maries in March
Highs average 50°10° and lows 30°−1°, with 3.3 in83 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 79°26° (1986)
- Record low
- −10°−23° (1955)
- Heating degree days
- 789
- Cooling degree days
- 0
St. Maries in April
Highs average 58°14° and lows 35°2°, with 2.3 in58 mm of precipitation and 0.7 in1.8 cm of snow in a typical April.
- Record high
- 95°35° (1987)
- Record low
- 8°−13° (1936)
- Heating degree days
- 557
- Cooling degree days
- 0
St. Maries in May
Highs average 68°20° and lows 42°6°, with 2.4 in62 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 95°35° (1936)
- Record low
- 20°−7° (1954)
- Heating degree days
- 321
- Cooling degree days
- 8
St. Maries in June
Highs average 74°23° and lows 48°9°, with 2.1 in54 mm of precipitation in a typical June.
- Record high
- 108°42° (2021)
- Record low
- 26°−3° (1930)
- Heating degree days
- 161
- Cooling degree days
- 33
St. Maries in July
Highs average 84°29° and lows 52°11°, with 0.79 in20 mm of precipitation in a typical July.
- Record high
- 106°41° (1918)
- Record low
- 30°−1° (1926)
- Heating degree days
- 40
- Cooling degree days
- 139
St. Maries in August
Highs average 85°29° and lows 51°11°, with 0.74 in19 mm of precipitation in a typical August.
- Record high
- 110°43° (2018)
- Record low
- 29°−2° (1984)
- Heating degree days
- 42
- Cooling degree days
- 128
St. Maries in September
Highs average 75°24° and lows 44°7°, with 1 in26 mm of precipitation in a typical September.
- Record high
- 104°40° (1988)
- Record low
- 18°−8° (1926)
- Heating degree days
- 200
- Cooling degree days
- 23
St. Maries in OctoberThis month
Highs average 59°15° and lows 36°2°, with 2.4 in61 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 90°32° (1943)
- Record low
- 9°−13° (1971)
- Heating degree days
- 554
- Cooling degree days
- 0
St. Maries in November
Highs average 44°7° and lows 30°−1°, with 4.2 in105 mm of precipitation and 7 in17 cm of snow in a typical November.
- Record high
- 73°23° (1908)
- Record low
- −6°−21° (1959)
- Heating degree days
- 850
- Cooling degree days
- 0
St. Maries in December
Highs average 36°2° and lows 24°−4°, with 4.4 in113 mm of precipitation and 18 in46 cm of snow in a typical December.
- Record high
- 64°18° (1917)
- Record low
- −29°−34° (1968)
- Heating degree days
- 1082
- Cooling degree days
- 0