Gilman weather by month
What a typical year looks like in Gilman, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Augusta, 4 km from Gilman; records cover 1896–2026.
The year at a glance
- Precipitation a year
- 15.5 in394 mm
- Snow a year
- Rare
- Last spring freeze
- May 29
- First fall freeze
- Sep 15
- Heating degree days
- 7,358
- Cooling degree days
- 251
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −21°−29° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Gilman in January
Highs average 39°4° and lows 17°−8°, with 0.45 in11 mm of precipitation in a typical January.
- Record high
- 71°22° (2014)
- Record low
- −51°−46° (1909)
- Heating degree days
- 1146
- Cooling degree days
- 0
Gilman in February
Highs average 40°4° and lows 16°−9°, with 0.69 in18 mm of precipitation in a typical February.
- Record high
- 72°22° (1992)
- Record low
- −48°−44° (1936)
- Heating degree days
- 1043
- Cooling degree days
- 0
Gilman in March
Highs average 47°8° and lows 24°−5°, with 0.71 in18 mm of precipitation in a typical March.
- Record high
- 76°24° (2004)
- Record low
- −40° (1951)
- Heating degree days
- 921
- Cooling degree days
- 0
Gilman in April
Highs average 55°13° and lows 31°0°, with 1.6 in42 mm of precipitation in a typical April.
- Record high
- 89°32° (1898)
- Record low
- −22°−30° (1935)
- Heating degree days
- 653
- Cooling degree days
- 0
Gilman in May
Highs average 65°18° and lows 39°4°, with 2.7 in68 mm of precipitation in a typical May.
- Record high
- 94°34° (1919)
- Record low
- 7°−14° (1954)
- Heating degree days
- 414
- Cooling degree days
- 4
Gilman in June
Highs average 72°22° and lows 47°8°, with 3 in76 mm of precipitation in a typical June.
- Record high
- 102°39° (1936)
- Record low
- 23°−5° (1951)
- Heating degree days
- 192
- Cooling degree days
- 20
Gilman in July
Highs average 82°28° and lows 51°11°, with 1.2 in30 mm of precipitation in a typical July.
- Record high
- 102°39° (1960)
- Record low
- 30°−1° (1904)
- Heating degree days
- 54
- Cooling degree days
- 111
Gilman in August
Highs average 82°28° and lows 50°10°, with 1.2 in30 mm of precipitation in a typical August.
- Record high
- 103°39° (1940)
- Record low
- 23°−5° (1910)
- Heating degree days
- 69
- Cooling degree days
- 92
Gilman in September
Highs average 73°23° and lows 42°6°, with 1.4 in35 mm of precipitation in a typical September.
- Record high
- 97°36° (2022)
- Record low
- 0°−18° (1926)
- Heating degree days
- 248
- Cooling degree days
- 22
Gilman in OctoberThis month
Highs average 59°15° and lows 34°1°, with 1.4 in36 mm of precipitation in a typical October.
- Record high
- 94°34° (1905)
- Record low
- −17°−27° (1991)
- Heating degree days
- 586
- Cooling degree days
- 2
Gilman in November
Highs average 45°7° and lows 26°−4°, with 0.7 in18 mm of precipitation in a typical November.
- Record high
- 79°26° (1962)
- Record low
- −39° (1903)
- Heating degree days
- 891
- Cooling degree days
- 0
Gilman in December
Highs average 38°4° and lows 18°−8°, with 0.51 in13 mm of precipitation in a typical December.
- Record high
- 69°21° (2013)
- Record low
- −48°−44° (1968)
- Heating degree days
- 1141
- Cooling degree days
- 0