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Grass Valley city, Oregon

Official LSAD Designation: Grass Valley city • Census GEOID: 4130650 • Sherman County

Climate Normals & Weather Observations

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

Reference Weather Station: MORO, OR US (ID: USC00355734) • Located 9.0 miles from community center • Elevation: 570.0 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 40.1° 24.5° 32.3° 1.47"
February 44.9° 26.2° 35.5° 1.06"
March 52.3° 30.1° 41.2° 0.97"
April 58.8° 34.5° 46.7° 0.96"
May 67.4° 41.6° 54.5° 0.96"
June 74.3° 47.0° 60.7° 0.57"
July 84.0° 53.0° 68.5° 0.18"
August 83.8° 52.6° 68.2° 0.20"
September 75.8° 45.4° 60.6° 0.43"
October 62.2° 36.2° 49.2° 1.06"
November 48.4° 28.7° 38.5° 1.54"
December 39.5° 24.2° 31.8° 1.61"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station MORO, OR US (ID: USC00355734) • 9.0 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 MORO, OR 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. 33.0 41.5 50.0 58.5 67.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 49.0°F 2011: Annual mean 48.5°F 2012: Annual mean 49.7°F 2013: Annual mean 49.7°F 2014: Annual mean 50.5°F 2016: Annual mean 50.1°F 2019: Annual mean 47.6°F 2021: Annual mean 51.3°F 2022: Annual mean 49.6°F 2010: Annual mean of daily highs 59.5°F 2011: Annual mean of daily highs 59.8°F 2012: Annual mean of daily highs 61.2°F 2013: Annual mean of daily highs 61.5°F 2014: Annual mean of daily highs 62.0°F 2016: Annual mean of daily highs 62.7°F 2019: Annual mean of daily highs 58.4°F 2021: Annual mean of daily highs 63.9°F 2022: Annual mean of daily highs 62.6°F 2010: Annual mean of daily lows 38.5°F 2011: Annual mean of daily lows 37.3°F 2012: Annual mean of daily lows 38.2°F 2013: Annual mean of daily lows 38.0°F 2014: Annual mean of daily lows 39.1°F 2016: Annual mean of daily lows 37.5°F 2019: Annual mean of daily lows 36.8°F 2021: Annual mean of daily lows 38.8°F 2022: Annual mean of daily lows 36.6°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 49.0 59.5 38.5
2011 48.5 59.8 37.3
2012 49.7 61.2 38.2
2013 49.7 61.5 38.0
2014 50.5 62.0 39.1
2015 Unavailable Unavailable Unavailable
2016 50.1 62.7 37.5
2017 Unavailable Unavailable Unavailable
2018 Unavailable Unavailable Unavailable
2019 47.6 58.4 36.8
2020 Unavailable Unavailable Unavailable
2021 51.3 63.9 38.8
2022 49.6 62.6 36.6
2023 Unavailable Unavailable Unavailable
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.