Bull Lake weather by month
What a typical year looks like in Bull Lake, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Heron 2 NW, 20 km from Bull Lake; records cover 1912–2026.
The year at a glance
- Precipitation a year
- 34.2 in869 mm
- Snow a year
- 84 in214 cm
- Last spring freeze
- May 22
- First fall freeze
- Sep 15
- Heating degree days
- 7,362
- Cooling degree days
- 132
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 2°−17° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Bull Lake in January
Highs average 33°1° and lows 23°−5°, with 4.5 in115 mm of precipitation and 27 in67 cm of snow in a typical January.
- Record high
- 61°16° (1913)
- Record low
- −39° (1927)
- Heating degree days
- 1145
- Cooling degree days
- 0
Bull Lake in February
Highs average 38°3° and lows 23°−5°, with 2.9 in74 mm of precipitation and 12 in31 cm of snow in a typical February.
- Record high
- 59°15° (1930)
- Record low
- −32°−36° (1936)
- Heating degree days
- 967
- Cooling degree days
- 0
Bull Lake in March
Highs average 47°8° and lows 27°−3°, with 3.3 in83 mm of precipitation and 11 in28 cm of snow in a typical March.
- Record high
- 73°23° (1915)
- Record low
- −22°−30° (1955)
- Heating degree days
- 877
- Cooling degree days
- 0
Bull Lake in April
Highs average 57°14° and lows 32°0°, with 2.7 in69 mm of precipitation and 1.3 in3.3 cm of snow in a typical April.
- Record high
- 88°31° (1926)
- Record low
- −1°−18° (1936)
- Heating degree days
- 628
- Cooling degree days
- 0
Bull Lake in May
Highs average 67°19° and lows 39°4°, with 2.8 in70 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 96°36° (1936)
- Record low
- 19°−7° (1954)
- Heating degree days
- 378
- Cooling degree days
- 2
Bull Lake in June
Highs average 73°23° and lows 45°7°, with 3 in76 mm of precipitation in a typical June.
- Record high
- 102°39° (2021)
- Record low
- 25°−4° (1926)
- Heating degree days
- 202
- Cooling degree days
- 12
Bull Lake in July
Highs average 82°28° and lows 47°8°, with 1.1 in28 mm of precipitation in a typical July.
- Record high
- 105°41° (1924)
- Record low
- 29°−2° (1924)
- Heating degree days
- 76
- Cooling degree days
- 61
Bull Lake in August
Highs average 82°28° and lows 46°8°, with 0.89 in23 mm of precipitation in a typical August.
- Record high
- 106°41° (1961)
- Record low
- 21°−6° (1969)
- Heating degree days
- 89
- Cooling degree days
- 53
Bull Lake in September
Highs average 71°22° and lows 40°5°, with 1.6 in41 mm of precipitation in a typical September.
- Record high
- 97°36° (1938)
- Record low
- 9°−13° (1926)
- Heating degree days
- 288
- Cooling degree days
- 4
Bull Lake in OctoberThis month
Highs average 55°13° and lows 34°1°, with 3.1 in79 mm of precipitation and 0.7 in1.8 cm of snow in a typical October.
- Record high
- 87°31° (1934)
- Record low
- 4°−16° (1935)
- Heating degree days
- 646
- Cooling degree days
- 0
Bull Lake in November
Highs average 40°5° and lows 29°−2°, with 4.1 in105 mm of precipitation and 8 in20 cm of snow in a typical November.
- Record high
- 68°20° (1950)
- Record low
- −14°−26° (1955)
- Heating degree days
- 908
- Cooling degree days
- 0
Bull Lake in December
Highs average 32°0° and lows 23°−5°, with 4.2 in106 mm of precipitation and 25 in62 cm of snow in a typical December.
- Record high
- 58°14° (1912)
- Record low
- −35°−37° (1968)
- Heating degree days
- 1158
- Cooling degree days
- 0