Thompson Falls weather by month
What a typical year looks like in Thompson Falls, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Thompson Falls Ph, 1 km from Thompson Falls; records cover 1956–2026.
The year at a glance
- Precipitation a year
- 22.1 in560 mm
- Snow a year
- 15 in39 cm
- Last spring freeze
- May 7
- First fall freeze
- Oct 4
- Heating degree days
- 6,671
- Cooling degree days
- 389
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 3°−16° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Thompson Falls in January
Highs average 34°1° and lows 24°−4°, with 2.3 in59 mm of precipitation and 2.5 in6.4 cm of snow in a typical January.
- Record high
- 63°17° (2005)
- Record low
- −22°−30° (1979)
- Heating degree days
- 1114
- Cooling degree days
- 0
Thompson Falls in February
Highs average 40°4° and lows 25°−4°, with 1.9 in49 mm of precipitation and 0.6 in1.5 cm of snow in a typical February.
- Record high
- 71°22° (1995)
- Record low
- −16°−27° (1956)
- Heating degree days
- 914
- Cooling degree days
- 0
Thompson Falls in March
Highs average 49°10° and lows 29°−1°, with 2 in51 mm of precipitation and 1.2 in3 cm of snow in a typical March.
- Record high
- 80°27° (2004)
- Record low
- −6°−21° (2019)
- Heating degree days
- 794
- Cooling degree days
- 0
Thompson Falls in April
Highs average 58°15° and lows 34°1°, with 1.7 in42 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 93°34° (1987)
- Record low
- 17°−8° (1966)
- Heating degree days
- 561
- Cooling degree days
- 0
Thompson Falls in May
Highs average 68°20° and lows 41°5°, with 2.1 in53 mm of precipitation in a typical May.
- Record high
- 99°37° (1986)
- Record low
- 24°−4° (1972)
- Heating degree days
- 320
- Cooling degree days
- 6
Thompson Falls in June
Highs average 75°24° and lows 48°9°, with 2.2 in56 mm of precipitation in a typical June.
- Record high
- 103°39° (2021)
- Record low
- 32°0° (1999)
- Heating degree days
- 152
- Cooling degree days
- 36
Thompson Falls in July
Highs average 86°30° and lows 53°12°, with 0.88 in22 mm of precipitation in a typical July.
- Record high
- 106°41° (1979)
- Record low
- 35°2° (1962)
- Heating degree days
- 30
- Cooling degree days
- 171
Thompson Falls in August
Highs average 86°30° and lows 52°11°, with 0.89 in23 mm of precipitation in a typical August.
- Record high
- 107°42° (1961)
- Record low
- 32°0° (1965)
- Heating degree days
- 31
- Cooling degree days
- 150
Thompson Falls in September
Highs average 75°24° and lows 44°7°, with 0.97 in25 mm of precipitation in a typical September.
- Record high
- 105°41° (1988)
- Record low
- 20°−7° (1985)
- Heating degree days
- 181
- Cooling degree days
- 26
Thompson Falls in OctoberThis month
Highs average 58°14° and lows 36°2°, with 2.2 in55 mm of precipitation and 0.7 in1.8 cm of snow in a typical October.
- Record high
- 88°31° (1987)
- Record low
- 6°−14° (2002)
- Heating degree days
- 560
- Cooling degree days
- 0
Thompson Falls in November
Highs average 41°5° and lows 29°−1°, with 2.6 in67 mm of precipitation and 2.5 in6.4 cm of snow in a typical November.
- Record high
- 74°23° (1999)
- Record low
- −7°−22° (1985)
- Heating degree days
- 889
- Cooling degree days
- 0
Thompson Falls in December
Highs average 33°0° and lows 25°−4°, with 2.3 in59 mm of precipitation and 8 in19 cm of snow in a typical December.
- Record high
- 61°16° (2021)
- Record low
- −25°−32° (1968)
- Heating degree days
- 1125
- Cooling degree days
- 0