Norris weather by month
What a typical year looks like in Norris, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Norris Madison Power House, 11 km from Norris; records cover 1907–2026.
The year at a glance
- Precipitation a year
- 18.4 in466 mm
- Snow a year
- 52 in132 cm
- Last spring freeze
- May 2
- First fall freeze
- Oct 6
- Heating degree days
- 6,262
- Cooling degree days
- 523
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −1°−18° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Norris in January
Highs average 39°4° and lows 24°−5°, with 0.53 in13 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 62°17° (1981)
- Record low
- −32°−36° (1909)
- Heating degree days
- 1043
- Cooling degree days
- 0
Norris in February
Highs average 42°5° and lows 25°−4°, with 0.74 in19 mm of precipitation and 13 in33 cm of snow in a typical February.
- Record high
- 65°18° (1986)
- Record low
- −36°−38° (1933)
- Heating degree days
- 896
- Cooling degree days
- 0
Norris in March
Highs average 50°10° and lows 30°−1°, with 1.2 in30 mm of precipitation and 7 in18 cm of snow in a typical March.
- Record high
- 75°24° (2026)
- Record low
- −17°−27° (1920)
- Heating degree days
- 777
- Cooling degree days
- 0
Norris in April
Highs average 57°14° and lows 36°2°, with 2.3 in57 mm of precipitation and 5 in13 cm of snow in a typical April.
- Record high
- 88°31° (1910)
- Record low
- −4°−20° (1936)
- Heating degree days
- 564
- Cooling degree days
- 0
Norris in May
Highs average 66°19° and lows 43°6°, with 3 in76 mm of precipitation and 1.6 in4.1 cm of snow in a typical May.
- Record high
- 94°34° (1919)
- Record low
- 17°−8° (1967)
- Heating degree days
- 324
- Cooling degree days
- 8
Norris in June
Highs average 75°24° and lows 50°10°, with 3.2 in81 mm of precipitation in a typical June.
- Record high
- 97°36° (1936)
- Record low
- 29°−2° (1924)
- Heating degree days
- 128
- Cooling degree days
- 53
Norris in July
Highs average 85°30° and lows 57°14°, with 1.3 in34 mm of precipitation in a typical July.
- Record high
- 102°39° (2002)
- Record low
- 31°−1° (1921)
- Heating degree days
- 19
- Cooling degree days
- 212
Norris in August
Highs average 85°29° and lows 56°13°, with 1.4 in36 mm of precipitation in a typical August.
- Record high
- 102°39° (1940)
- Record low
- 33°1° (1911)
- Heating degree days
- 23
- Cooling degree days
- 195
Norris in September
Highs average 75°24° and lows 49°9°, with 1.4 in37 mm of precipitation in a typical September.
- Record high
- 99°37° (2022)
- Record low
- 13°−11° (1926)
- Heating degree days
- 145
- Cooling degree days
- 52
Norris in OctoberThis month
Highs average 60°16° and lows 39°4°, with 1.7 in43 mm of precipitation and 2.7 in6.9 cm of snow in a typical October.
- Record high
- 88°31° (1992)
- Record low
- −4°−20° (1935)
- Heating degree days
- 485
- Cooling degree days
- 3
Norris in November
Highs average 47°8° and lows 30°−1°, with 0.81 in21 mm of precipitation and 5 in14 cm of snow in a typical November.
- Record high
- 78°26° (1909)
- Record low
- −18°−28° (1959)
- Heating degree days
- 798
- Cooling degree days
- 0
Norris in December
Highs average 38°3° and lows 24°−5°, with 0.82 in21 mm of precipitation and 10 in25 cm of snow in a typical December.
- Record high
- 66°19° (1939)
- Record low
- −28°−33° (1924)
- Heating degree days
- 1060
- Cooling degree days
- 0