Dell weather by month
What a typical year looks like in Dell, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Lima, 13 km from Dell; records cover 1898–2026.
The year at a glance
- Precipitation a year
- 10.4 in263 mm
- Snow a year
- 53 in134 cm
- Last spring freeze
- Jun 18
- First fall freeze
- Aug 31
- Heating degree days
- 8,678
- Cooling degree days
- 134
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 90°32° (cooling, 1%).
Month by month
Dell in January
Highs average 30°−1° and lows 11°−12°, with 0.24 in6.1 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 60°16° (1900)
- Record low
- −44°−42° (1943)
- Heating degree days
- 1376
- Cooling degree days
- 0
Dell in February
Highs average 34°1° and lows 12°−11°, with 0.25 in6.4 mm of precipitation and 5 in13 cm of snow in a typical February.
- Record high
- 59°15° (2026)
- Record low
- −43°−42° (1933)
- Heating degree days
- 1182
- Cooling degree days
- 0
Dell in March
Highs average 44°7° and lows 21°−6°, with 0.4 in10 mm of precipitation and 7 in17 cm of snow in a typical March.
- Record high
- 73°23° (2026)
- Record low
- −29°−34° (1943)
- Heating degree days
- 1017
- Cooling degree days
- 0
Dell in April
Highs average 53°12° and lows 27°−3°, with 0.93 in24 mm of precipitation and 10 in26 cm of snow in a typical April.
- Record high
- 79°26° (1946)
- Record low
- −7°−22° (1997)
- Heating degree days
- 754
- Cooling degree days
- 0
Dell in May
Highs average 62°17° and lows 35°2°, with 1.7 in42 mm of precipitation and 5 in12 cm of snow in a typical May.
- Record high
- 90°32° (1931)
- Record low
- 7°−14° (1943)
- Heating degree days
- 504
- Cooling degree days
- 1
Dell in June
Highs average 72°22° and lows 42°5°, with 2 in51 mm of precipitation and 1.1 in2.8 cm of snow in a typical June.
- Record high
- 95°35° (1900)
- Record low
- 17°−8° (1942)
- Heating degree days
- 260
- Cooling degree days
- 11
Dell in July
Highs average 83°28° and lows 47°8°, with 1.3 in32 mm of precipitation in a typical July.
- Record high
- 100°38° (1901)
- Record low
- 24°−4° (1944)
- Heating degree days
- 72
- Cooling degree days
- 71
Dell in August
Highs average 81°27° and lows 46°8°, with 1 in26 mm of precipitation in a typical August.
- Record high
- 99°37° (1941)
- Record low
- 23°−5° (1965)
- Heating degree days
- 92
- Cooling degree days
- 45
Dell in September
Highs average 71°22° and lows 39°4°, with 0.92 in23 mm of precipitation and 0.6 in1.5 cm of snow in a typical September.
- Record high
- 93°34° (2017)
- Record low
- 6°−14° (1985)
- Heating degree days
- 306
- Cooling degree days
- 6
Dell in OctoberThis month
Highs average 56°14° and lows 29°−2°, with 0.98 in25 mm of precipitation and 7 in17 cm of snow in a typical October.
- Record high
- 83°28° (2011)
- Record low
- −16°−27° (1935)
- Heating degree days
- 688
- Cooling degree days
- 0
Dell in November
Highs average 41°5° and lows 19°−7°, with 0.41 in10 mm of precipitation and 6 in15 cm of snow in a typical November.
- Record high
- 71°22° (1901)
- Record low
- −35°−37° (1959)
- Heating degree days
- 1048
- Cooling degree days
- 0
Dell in December
Highs average 30°−1° and lows 11°−11°, with 0.28 in7.1 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 66°19° (1931)
- Record low
- −44°−42° (1990)
- Heating degree days
- 1379
- Cooling degree days
- 0