Winston weather by month
What a typical year looks like in Winston, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Townsend 3se, 25 km from Winston; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 10.6 in268 mm
- Snow a year
- 24 in60 cm
- Last spring freeze
- May 19
- First fall freeze
- Sep 13
- Heating degree days
- 7,543
- Cooling degree days
- 254
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Winston in January
Highs average 34°1° and lows 14°−10°, with 0.28 in7.1 mm of precipitation and 4 in11 cm of snow in a typical January.
- Record high
- 64°18° (1992)
- Record low
- −39° (1957)
- Heating degree days
- 1277
- Cooling degree days
- 0
Winston in February
Highs average 39°4° and lows 17°−9°, with 0.28 in7.1 mm of precipitation and 3 in8 cm of snow in a typical February.
- Record high
- 72°22° (1995)
- Record low
- −38°−39° (1989)
- Heating degree days
- 1047
- Cooling degree days
- 0
Winston in March
Highs average 49°10° and lows 24°−5°, with 0.42 in11 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 79°26° (2026)
- Record low
- −37°−38° (2019)
- Heating degree days
- 885
- Cooling degree days
- 0
Winston in April
Highs average 58°15° and lows 31°−1°, with 0.85 in22 mm of precipitation and 2.3 in5.8 cm of snow in a typical April.
- Record high
- 88°31° (1992)
- Record low
- 0°−18° (2008)
- Heating degree days
- 612
- Cooling degree days
- 0
Winston in May
Highs average 67°19° and lows 39°4°, with 1.8 in45 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 94°34° (1954)
- Record low
- 13°−11° (1954)
- Heating degree days
- 368
- Cooling degree days
- 3
Winston in June
Highs average 74°23° and lows 47°8°, with 2.5 in64 mm of precipitation in a typical June.
- Record high
- 100°38° (1990)
- Record low
- 19°−7° (1950)
- Heating degree days
- 163
- Cooling degree days
- 27
Winston in July
Highs average 83°29° and lows 52°11°, with 1.2 in31 mm of precipitation in a typical July.
- Record high
- 101°38° (2006)
- Record low
- 34°1° (1971)
- Heating degree days
- 39
- Cooling degree days
- 118
Winston in August
Highs average 83°28° and lows 50°10°, with 1.1 in28 mm of precipitation in a typical August.
- Record high
- 105°41° (1961)
- Record low
- 25°−4° (1992)
- Heating degree days
- 56
- Cooling degree days
- 92
Winston in September
Highs average 73°23° and lows 42°5°, with 0.78 in20 mm of precipitation in a typical September.
- Record high
- 99°37° (1981)
- Record low
- 12°−11° (1950)
- Heating degree days
- 249
- Cooling degree days
- 14
Winston in OctoberThis month
Highs average 59°15° and lows 32°0°, with 0.65 in17 mm of precipitation and 1.4 in3.6 cm of snow in a typical October.
- Record high
- 89°32° (1963)
- Record low
- −11°−24° (1991)
- Heating degree days
- 614
- Cooling degree days
- 0
Winston in November
Highs average 44°7° and lows 22°−5°, with 0.39 in9.9 mm of precipitation and 4 in10 cm of snow in a typical November.
- Record high
- 75°24° (1988)
- Record low
- −29°−34° (1959)
- Heating degree days
- 962
- Cooling degree days
- 0
Winston in December
Highs average 34°1° and lows 14°−10°, with 0.3 in7.6 mm of precipitation and 4 in11 cm of snow in a typical December.
- Record high
- 69°21° (2021)
- Record low
- −37°−38° (1983)
- Heating degree days
- 1271
- Cooling degree days
- 0