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Custer CDP, Montana

Official LSAD Designation: Custer CDP • Census GEOID: 3018700 • Yellowstone County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Custer CDP.

Reference Weather Station: HYSHAM, MT US (ID: USC00244358) • Located 19.1 miles from community center • Elevation: 813.5 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 34.7° 12.4° 23.6° 0.61"
February 38.7° 15.3° 27.0° 0.58"
March 50.5° 23.8° 37.1° 0.80"
April 60.5° 33.0° 46.8° 1.72"
May 69.8° 42.5° 56.1° 2.47"
June 78.7° 51.7° 65.2° 2.22"
July 87.6° 57.5° 72.5° 1.51"
August 86.0° 55.1° 70.6° 1.16"
September 75.3° 45.5° 60.4° 1.40"
October 60.4° 34.2° 47.3° 1.38"
November 46.7° 23.1° 34.9° 0.59"
December 36.2° 14.7° 25.4° 0.48"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station HYSHAM, MT US (ID: USC00244358) • 19.1 miles from community center .

This is the same reference station used for monthly normals.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at HYSHAM, MT US Year is the horizontal axis. Annual mean temperature in degrees Fahrenheit is the vertical axis. Dots show recorded years; lines connect consecutive available years only. Missing years are gaps, with no interpolation. Optional dashed lines show annual mean of daily highs and lows. Exact values appear in the data table below. 28.0 38.0 48.0 58.0 68.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2012: Annual mean 50.2°F 2013: Annual mean 47.8°F 2014: Annual mean 46.7°F 2016: Annual mean 49.4°F 2017: Annual mean 48.0°F 2018: Annual mean 44.8°F 2019: Annual mean 44.3°F 2020: Annual mean 47.7°F 2021: Annual mean 47.9°F 2023: Annual mean 49.6°F 2025: Annual mean 49.0°F 2012: Annual mean of daily highs 64.1°F 2013: Annual mean of daily highs 60.0°F 2014: Annual mean of daily highs 59.0°F 2016: Annual mean of daily highs 62.5°F 2017: Annual mean of daily highs 60.8°F 2018: Annual mean of daily highs 56.9°F 2019: Annual mean of daily highs 56.6°F 2020: Annual mean of daily highs 61.6°F 2021: Annual mean of daily highs 62.4°F 2023: Annual mean of daily highs 62.0°F 2025: Annual mean of daily highs 62.1°F 2010: Annual mean of daily lows 33.5°F 2011: Annual mean of daily lows 34.7°F 2012: Annual mean of daily lows 36.4°F 2013: Annual mean of daily lows 35.6°F 2014: Annual mean of daily lows 34.3°F 2016: Annual mean of daily lows 36.3°F 2017: Annual mean of daily lows 35.1°F 2018: Annual mean of daily lows 32.7°F 2019: Annual mean of daily lows 32.0°F 2020: Annual mean of daily lows 33.8°F 2021: Annual mean of daily lows 33.4°F 2023: Annual mean of daily lows 37.1°F 2025: Annual mean of daily lows 35.9°F

Source: NOAA NCEI Global Summary of the Year.

Annual temperature data table (°F)
Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year Annual mean (°F) Annual mean of daily highs (°F) Annual mean of daily lows (°F)
2010 Unavailable Unavailable 33.5
2011 Unavailable Unavailable 34.7
2012 50.2 64.1 36.4
2013 47.8 60.0 35.6
2014 46.7 59.0 34.3
2015 Unavailable Unavailable Unavailable
2016 49.4 62.5 36.3
2017 48.0 60.8 35.1
2018 44.8 56.9 32.7
2019 44.3 56.6 32.0
2020 47.7 61.6 33.8
2021 47.9 62.4 33.4
2022 Unavailable Unavailable Unavailable
2023 49.6 62.0 37.1
2024 Unavailable Unavailable Unavailable
2025 49.0 62.1 35.9
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.