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Roche Harbor CDP, Washington

Official LSAD Designation: Roche Harbor CDP • Census GEOID: 5359075 • San Juan County

Climate Normals & Weather Observations

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

Reference Weather Station: FRIDAY HARBOR AP, WA US (ID: USW00094276) • Located 7.7 miles from community center • Elevation: 33.2 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 47.1° 37.1° 42.1° 2.69"
February 48.5° 36.5° 42.5° 1.54"
March 52.6° 38.4° 45.5° 1.35"
April 57.4° 40.7° 49.1° 1.01"
May 63.7° 44.3° 54.0° 1.14"
June 68.4° 48.1° 58.2° 0.75"
July 72.4° 50.0° 61.2° 0.48"
August 73.3° 50.0° 61.6° 0.70"
September 68.1° 47.9° 58.0° 1.04"
October 58.5° 44.0° 51.2° 2.34"
November 51.0° 39.8° 45.4° 2.98"
December 46.3° 36.8° 41.6° 2.45"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station FRIDAY HARBOR AP, WA US (ID: USW00094276) • 7.7 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 FRIDAY HARBOR AP, WA 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. 39.0 45.0 51.0 57.0 63.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 50.6°F 2011: Annual mean 49.1°F 2012: Annual mean 49.8°F 2013: Annual mean 49.4°F 2014: Annual mean 50.9°F 2015: Annual mean 51.8°F 2016: Annual mean 52.3°F 2017: Annual mean 50.2°F 2018: Annual mean 51.6°F 2020: Annual mean 50.5°F 2021: Annual mean 50.3°F 2022: Annual mean 50.1°F 2023: Annual mean 52.7°F 2024: Annual mean 53.2°F 2010: Annual mean of daily highs 58.3°F 2011: Annual mean of daily highs 57.0°F 2012: Annual mean of daily highs 57.6°F 2013: Annual mean of daily highs 57.3°F 2014: Annual mean of daily highs 59.3°F 2015: Annual mean of daily highs 60.2°F 2016: Annual mean of daily highs 60.4°F 2017: Annual mean of daily highs 58.6°F 2018: Annual mean of daily highs 59.9°F 2020: Annual mean of daily highs 58.5°F 2021: Annual mean of daily highs 58.1°F 2022: Annual mean of daily highs 58.1°F 2023: Annual mean of daily highs 60.9°F 2024: Annual mean of daily highs 60.9°F 2010: Annual mean of daily lows 42.9°F 2011: Annual mean of daily lows 41.2°F 2012: Annual mean of daily lows 42.0°F 2013: Annual mean of daily lows 41.5°F 2014: Annual mean of daily lows 42.6°F 2015: Annual mean of daily lows 43.3°F 2016: Annual mean of daily lows 44.1°F 2017: Annual mean of daily lows 41.8°F 2018: Annual mean of daily lows 43.3°F 2019: Annual mean of daily lows 42.9°F 2020: Annual mean of daily lows 42.5°F 2021: Annual mean of daily lows 42.4°F 2022: Annual mean of daily lows 42.2°F 2023: Annual mean of daily lows 44.4°F 2024: Annual mean of daily lows 45.5°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 50.6 58.3 42.9
2011 49.1 57.0 41.2
2012 49.8 57.6 42.0
2013 49.4 57.3 41.5
2014 50.9 59.3 42.6
2015 51.8 60.2 43.3
2016 52.3 60.4 44.1
2017 50.2 58.6 41.8
2018 51.6 59.9 43.3
2019 Unavailable Unavailable 42.9
2020 50.5 58.5 42.5
2021 50.3 58.1 42.4
2022 50.1 58.1 42.2
2023 52.7 60.9 44.4
2024 53.2 60.9 45.5
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.