Union CDP, Washington

Official LSAD Designation: Union CDP • Census GEOID: 5373255 • Mason County

Climate Normals & Weather Observations

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

Reference Weather Station: CUSHMAN POWERHOUSE #2, WA US (ID: USC00451939) • Located 3.4 miles from community center • Elevation: 6.4 m

Month	Average High (°F)	Average Low (°F)	Mean Temp (°F)	Precipitation (in)
January	45.3°	35.7°	40.5°	15.48"
February	48.0°	35.2°	41.6°	9.20"
March	52.5°	37.2°	44.9°	9.89"
April	57.7°	40.1°	48.9°	6.13"
May	65.3°	45.8°	55.5°	3.03"
June	69.6°	50.1°	59.9°	1.91"
July	75.6°	54.0°	64.8°	0.87"
August	75.5°	54.0°	64.8°	1.40"
September	69.3°	49.9°	59.6°	3.02"
October	58.4°	44.0°	51.2°	9.10"
November	49.7°	38.6°	44.1°	15.72"
December	44.2°	35.2°	39.7°	16.21"

2010–2025, completed calendar years only.

NOAA station CUSHMAN POWERHOUSE #2, WA US (ID: USC00451939) • 3.4 miles from community center .

This is the same reference station used for monthly normals.

Show annual mean of daily highs and lows

Annual mean Annual mean of daily highs Annual mean of daily lows

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	50.1	57.3	42.9
2011	48.8	56.1	41.5
2012	49.5	56.9	42.1
2013	50.2	57.6	42.8
2014	51.9	59.8	44.1
2015	Unavailable	Unavailable	Unavailable
2016	Unavailable	Unavailable	Unavailable
2017	50.7	58.9	42.6
2018	51.6	59.9	43.3
2019	51.0	59.1	43.0
2020	51.9	60.2	43.7
2021	51.4	59.6	43.2
2022	50.9	59.0	42.9
2023	51.9	60.3	43.4
2024	51.7	59.5	43.9
2025	51.9	60.3	43.6

Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.