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Pompeys Pillar CDP, Montana

Official LSAD Designation: Pompeys Pillar CDP • Census GEOID: 3058825 • Yellowstone County

Climate Normals & Weather Observations

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

Reference Weather Station: POMPEYS PILLAR 15N, MT US (ID: USC00246647) • Located 14.5 miles from community center • Elevation: 1,033.3 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 33.6° 10.2° 21.9° 0.51"
February 36.7° 12.0° 24.4° 0.57"
March 46.4° 19.5° 33.0° 0.74"
April 55.2° 29.0° 42.1° 1.63"
May 64.8° 38.8° 51.8° 2.59"
June 74.6° 47.9° 61.3° 2.65"
July 85.0° 54.3° 69.7° 1.35"
August 85.3° 52.4° 68.8° 0.90"
September 73.2° 42.4° 57.8° 1.20"
October 58.0° 30.3° 44.1° 1.40"
November 45.0° 19.3° 32.2° 0.54"
December 35.5° 12.1° 23.8° 0.44"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station POMPEYS PILLAR 15N, MT US (ID: USC00246647) • 14.5 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 POMPEYS PILLAR 15N, 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. 24.0 34.3 44.5 54.8 65.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2012: Annual mean 47.9°F 2013: Annual mean 44.7°F 2014: Annual mean 43.1°F 2015: Annual mean 46.5°F 2016: Annual mean 46.5°F 2017: Annual mean 44.7°F 2018: Annual mean 41.9°F 2019: Annual mean 40.9°F 2022: Annual mean 45.8°F 2024: Annual mean 47.3°F 2025: Annual mean 46.4°F 2011: Annual mean of daily highs 57.3°F 2012: Annual mean of daily highs 61.4°F 2013: Annual mean of daily highs 57.5°F 2014: Annual mean of daily highs 56.5°F 2015: Annual mean of daily highs 60.9°F 2016: Annual mean of daily highs 60.2°F 2017: Annual mean of daily highs 58.3°F 2018: Annual mean of daily highs 54.8°F 2019: Annual mean of daily highs 53.8°F 2022: Annual mean of daily highs 58.6°F 2023: Annual mean of daily highs 60.6°F 2024: Annual mean of daily highs 60.1°F 2025: Annual mean of daily highs 58.6°F 2012: Annual mean of daily lows 34.4°F 2013: Annual mean of daily lows 31.9°F 2014: Annual mean of daily lows 29.8°F 2015: Annual mean of daily lows 32.2°F 2016: Annual mean of daily lows 32.9°F 2017: Annual mean of daily lows 31.2°F 2018: Annual mean of daily lows 29.0°F 2019: Annual mean of daily lows 28.0°F 2022: Annual mean of daily lows 33.0°F 2024: Annual mean of daily lows 34.5°F 2025: Annual mean of daily lows 34.2°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 Unavailable
2011 Unavailable 57.3 Unavailable
2012 47.9 61.4 34.4
2013 44.7 57.5 31.9
2014 43.1 56.5 29.8
2015 46.5 60.9 32.2
2016 46.5 60.2 32.9
2017 44.7 58.3 31.2
2018 41.9 54.8 29.0
2019 40.9 53.8 28.0
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 45.8 58.6 33.0
2023 Unavailable 60.6 Unavailable
2024 47.3 60.1 34.5
2025 46.4 58.6 34.2
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.