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Monte Rio CDP, California

Official LSAD Designation: Monte Rio CDP • Census GEOID: 0648928 • Sonoma County

Climate Normals & Weather Observations

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

Reference Weather Station: OCCIDENTAL, CA US (ID: USC00046370) • Located 6.9 miles from community center • Elevation: 263.7 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 56.1° 42.0° 49.1° 10.79"
February 58.5° 42.9° 50.7° 9.92"
March 61.3° 44.0° 52.7° 6.99"
April 66.0° 45.1° 55.6° 3.75"
May 70.4° 47.8° 59.1° 2.01"
June 76.4° 51.0° 63.7° 0.58"
July 77.9° 52.1° 65.0° 0.09"
August 78.4° 53.4° 65.9° 0.09"
September 76.7° 53.4° 65.1° 0.18"
October 72.8° 51.9° 62.4° 2.65"
November 62.3° 45.9° 54.1° 5.70"
December 55.2° 41.2° 48.2° 11.08"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station GRATON, CA US (ID: USC00043578) • 9.2 miles from community center .

This annual reference station differs from the monthly normals station (ID: USC00046370), which has no available annual mean history.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at GRATON, CA 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. 36.0 47.0 58.0 69.0 80.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 56.9°F 2011: Annual mean 56.7°F 2012: Annual mean 57.5°F 2013: Annual mean 57.8°F 2014: Annual mean 59.9°F 2015: Annual mean 60.0°F 2016: Annual mean 58.7°F 2017: Annual mean 58.9°F 2018: Annual mean 58.4°F 2020: Annual mean 60.0°F 2021: Annual mean 58.4°F 2022: Annual mean 59.2°F 2025: Annual mean 58.1°F 2010: Annual mean of daily highs 71.2°F 2011: Annual mean of daily highs 72.3°F 2012: Annual mean of daily highs 74.0°F 2013: Annual mean of daily highs 75.4°F 2014: Annual mean of daily highs 75.8°F 2015: Annual mean of daily highs 76.4°F 2016: Annual mean of daily highs 74.0°F 2017: Annual mean of daily highs 74.9°F 2018: Annual mean of daily highs 73.1°F 2020: Annual mean of daily highs 75.9°F 2021: Annual mean of daily highs 73.6°F 2022: Annual mean of daily highs 74.8°F 2025: Annual mean of daily highs 72.1°F 2010: Annual mean of daily lows 42.6°F 2011: Annual mean of daily lows 41.1°F 2012: Annual mean of daily lows 41.0°F 2013: Annual mean of daily lows 40.3°F 2014: Annual mean of daily lows 44.1°F 2015: Annual mean of daily lows 43.5°F 2016: Annual mean of daily lows 43.4°F 2017: Annual mean of daily lows 42.9°F 2018: Annual mean of daily lows 43.7°F 2020: Annual mean of daily lows 44.0°F 2021: Annual mean of daily lows 43.2°F 2022: Annual mean of daily lows 43.7°F 2025: Annual mean of daily lows 44.0°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 56.9 71.2 42.6
2011 56.7 72.3 41.1
2012 57.5 74.0 41.0
2013 57.8 75.4 40.3
2014 59.9 75.8 44.1
2015 60.0 76.4 43.5
2016 58.7 74.0 43.4
2017 58.9 74.9 42.9
2018 58.4 73.1 43.7
2019 Unavailable Unavailable Unavailable
2020 60.0 75.9 44.0
2021 58.4 73.6 43.2
2022 59.2 74.8 43.7
2023 Unavailable Unavailable Unavailable
2024 Unavailable Unavailable Unavailable
2025 58.1 72.1 44.0
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.