Troy weather by month
What a typical year looks like in Troy, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Troy, 2 km from Troy; records cover 1960–2026.
The year at a glance
- Precipitation a year
- 24.4 in620 mm
- Snow a year
- Rare
- Last spring freeze
- May 14
- First fall freeze
- Sep 21
- Heating degree days
- 6,899
- Cooling degree days
- 287
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 1°−17° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Troy in January
Highs average 33°0° and lows 23°−5°, with 2.6 in67 mm of precipitation in a typical January.
- Record high
- 57°14° (2020)
- Record low
- −28°−33° (2004)
- Heating degree days
- 1153
- Cooling degree days
- 0
Troy in February
Highs average 39°4° and lows 24°−5°, with 1.9 in47 mm of precipitation in a typical February.
- Record high
- 64°18° (1995)
- Record low
- −20°−29° (1989)
- Heating degree days
- 944
- Cooling degree days
- 0
Troy in March
Highs average 50°10° and lows 28°−2°, with 2.4 in62 mm of precipitation in a typical March.
- Record high
- 82°28° (2004)
- Record low
- −6°−21° (2009)
- Heating degree days
- 811
- Cooling degree days
- 0
Troy in April
Highs average 59°15° and lows 33°1°, with 1.7 in42 mm of precipitation in a typical April.
- Record high
- 87°31° (1977)
- Record low
- 8°−13° (1975)
- Heating degree days
- 569
- Cooling degree days
- 0
Troy in May
Highs average 70°21° and lows 40°5°, with 1.8 in45 mm of precipitation in a typical May.
- Record high
- 97°36° (2001)
- Record low
- 22°−6° (1968)
- Heating degree days
- 317
- Cooling degree days
- 5
Troy in June
Highs average 76°24° and lows 46°8°, with 2.5 in64 mm of precipitation in a typical June.
- Record high
- 109°43° (2021)
- Record low
- 27°−3° (1985)
- Heating degree days
- 152
- Cooling degree days
- 32
Troy in July
Highs average 87°30° and lows 49°10°, with 0.88 in22 mm of precipitation in a typical July.
- Record high
- 110°43° (2003)
- Record low
- 26°−3° (1962)
- Heating degree days
- 34
- Cooling degree days
- 128
Troy in August
Highs average 86°30° and lows 48°9°, with 0.71 in18 mm of precipitation in a typical August.
- Record high
- 110°43° (1994)
- Record low
- 31°−1° (1980)
- Heating degree days
- 49
- Cooling degree days
- 106
Troy in September
Highs average 75°24° and lows 42°5°, with 1.2 in31 mm of precipitation in a typical September.
- Record high
- 102°39° (1998)
- Record low
- 17°−8° (1985)
- Heating degree days
- 217
- Cooling degree days
- 16
Troy in OctoberThis month
Highs average 57°14° and lows 35°1°, with 2.4 in61 mm of precipitation in a typical October.
- Record high
- 84°29° (2003)
- Record low
- −3°−19° (2002)
- Heating degree days
- 603
- Cooling degree days
- 0
Troy in November
Highs average 41°5° and lows 29°−1°, with 3.5 in89 mm of precipitation in a typical November.
- Record high
- 69°21° (1975)
- Record low
- −14°−26° (1985)
- Heating degree days
- 902
- Cooling degree days
- 0
Troy in December
Highs average 32°0° and lows 24°−5°, with 2.8 in71 mm of precipitation in a typical December.
- Record high
- 60°16° (2021)
- Record low
- −35°−37° (1968)
- Heating degree days
- 1148
- Cooling degree days
- 0