Judith Gap weather by month
What a typical year looks like in Judith Gap, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Harlowton 11nw, 19 km from Judith Gap; records cover 2010–2026.
The year at a glance
- Precipitation a year
- 16 in406 mm
- Snow a year
- Rare
- Last spring freeze
- May 29
- First fall freeze
- Sep 7
- Heating degree days
- 8,215
- Cooling degree days
- 198
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −16°−27° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Judith Gap in January
Highs average 36°2° and lows 14°−10°, with 0.46 in12 mm of precipitation in a typical January.
- Record high
- 62°17° (2015)
- Record low
- −47°−44° (2024)
- Heating degree days
- 1249
- Cooling degree days
- 0
Judith Gap in February
Highs average 36°2° and lows 14°−10°, with 0.49 in12 mm of precipitation in a typical February.
- Record high
- 64°18° (2026)
- Record low
- −39° (2021)
- Heating degree days
- 1128
- Cooling degree days
- 0
Judith Gap in March
Highs average 45°7° and lows 21°−6°, with 0.62 in16 mm of precipitation in a typical March.
- Record high
- 75°24° (2026)
- Record low
- −33°−36° (2019)
- Heating degree days
- 992
- Cooling degree days
- 0
Judith Gap in April
Highs average 54°12° and lows 28°−2°, with 1.4 in35 mm of precipitation in a typical April.
- Record high
- 81°27° (2012)
- Record low
- −10°−23° (2018)
- Heating degree days
- 724
- Cooling degree days
- 0
Judith Gap in May
Highs average 62°17° and lows 36°2°, with 2.9 in72 mm of precipitation in a typical May.
- Record high
- 87°31° (2026)
- Record low
- 11°−12° (2013)
- Heating degree days
- 498
- Cooling degree days
- 1
Judith Gap in June
Highs average 70°21° and lows 44°6°, with 3.3 in84 mm of precipitation in a typical June.
- Record high
- 98°37° (2021)
- Record low
- 28°−2° (2024)
- Heating degree days
- 249
- Cooling degree days
- 9
Judith Gap in July
Highs average 82°28° and lows 51°10°, with 1.9 in47 mm of precipitation in a typical July.
- Record high
- 103°39° (2026)
- Record low
- 34°1° (2018)
- Heating degree days
- 56
- Cooling degree days
- 91
Judith Gap in August
Highs average 81°27° and lows 49°10°, with 1.4 in36 mm of precipitation in a typical August.
- Record high
- 100°38° (2026)
- Record low
- 28°−2° (2015)
- Heating degree days
- 79
- Cooling degree days
- 81
Judith Gap in September
Highs average 71°22° and lows 41°5°, with 1.3 in33 mm of precipitation in a typical September.
- Record high
- 97°36° (2022)
- Record low
- 17°−8° (2019)
- Heating degree days
- 288
- Cooling degree days
- 15
Judith Gap in OctoberThis month
Highs average 56°13° and lows 31°−1°, with 0.94 in24 mm of precipitation in a typical October.
- Record high
- 83°28° (2010)
- Record low
- −15°−26° (2020)
- Heating degree days
- 679
- Cooling degree days
- 1
Judith Gap in November
Highs average 42°5° and lows 21°−6°, with 0.78 in20 mm of precipitation in a typical November.
- Record high
- 70°21° (2010)
- Record low
- −24°−31° (2010)
- Heating degree days
- 1005
- Cooling degree days
- 0
Judith Gap in December
Highs average 34°1° and lows 14°−10°, with 0.58 in15 mm of precipitation in a typical December.
- Record high
- 62°17° (2021)
- Record low
- −39° (2022)
- Heating degree days
- 1268
- Cooling degree days
- 0