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Boulder city, Montana

Official LSAD Designation: Boulder city • Census GEOID: 3008575 • Jefferson County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Boulder city.

Reference Weather Station: BOULDER, MT US (ID: USC00241008) • Located 0.4 miles from community center • Elevation: 1,494.7 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 35.0° 11.9° 23.5° 0.28"
February 37.8° 14.0° 25.9° 0.19"
March 46.8° 20.8° 33.8° 0.40"
April 54.5° 27.0° 40.7° 0.78"
May 63.6° 35.3° 49.4° 1.86"
June 72.0° 42.5° 57.2° 2.30"
July 82.5° 48.3° 65.4° 1.38"
August 82.0° 46.2° 64.1° 1.12"
September 71.9° 38.1° 55.0° 1.10"
October 57.4° 27.7° 42.6° 0.64"
November 42.4° 18.6° 30.5° 0.48"
December 33.6° 11.5° 22.5° 0.27"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station BOULDER, MT US (ID: USC00241008) • 0.4 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 BOULDER, 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. 25.0 34.8 44.5 54.3 64.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2013: Annual mean 44.1°F 2014: Annual mean 42.7°F 2015: Annual mean 45.3°F 2016: Annual mean 43.9°F 2017: Annual mean 43.0°F 2024: Annual mean 44.4°F 2012: Annual mean of daily highs 60.2°F 2013: Annual mean of daily highs 58.4°F 2014: Annual mean of daily highs 56.8°F 2015: Annual mean of daily highs 59.8°F 2016: Annual mean of daily highs 57.7°F 2017: Annual mean of daily highs 57.3°F 2024: Annual mean of daily highs 59.9°F 2013: Annual mean of daily lows 29.7°F 2014: Annual mean of daily lows 28.5°F 2015: Annual mean of daily lows 30.7°F 2016: Annual mean of daily lows 30.0°F 2017: Annual mean of daily lows 28.7°F 2024: Annual mean of daily lows 29.0°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 Unavailable Unavailable
2012 Unavailable 60.2 Unavailable
2013 44.1 58.4 29.7
2014 42.7 56.8 28.5
2015 45.3 59.8 30.7
2016 43.9 57.7 30.0
2017 43.0 57.3 28.7
2018 Unavailable Unavailable Unavailable
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 Unavailable Unavailable Unavailable
2024 44.4 59.9 29.0
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.