Castle Rock, WA Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Castle Rock for August is 65.7 degrees
The lowest monthly average temperature in Castle Rock for December is 39.3 degrees
The most monthly precipitation in Castle Rock occurs in December with 8.9 inches
The air quality index in Castle Rock is 57% better than the national average
The pollution index in Castle Rock is 55% worse than the national average

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Castle Rock Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	35°F	47°F	40°F	8.3"
February	36°F	52°F	42°F	5.4"
March	40°F	56°F	46°F	6.0"
April	41°F	62°F	50°F	4.8"
May	47°F	69°F	56°F	5.7"
June	52°F	73°F	60°F	3.6"
July	55°F	80°F	65°F	2.1"
August	55°F	81°F	66°F	2.8"
September	51°F	75°F	61°F	5.1"
October	46°F	63°F	53°F	6.4"
November	40°F	52°F	45°F	8.2"
December	35°F	45°F	39°F	8.9"

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Castle Rock air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
Index	Castle Rock	Washington	National
Air quality index	18	36	42
Pollution index	4,215,410	4,541,850	2,726,193

Castle Rock air quality

Measurement	Total
Days measured	360
Days with good air quality	338
Days with moderate air quality	22
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.005%
Benzene	0.050%
Carbon Tetrachloride	0.004%
Lead	0.030%
Mercury	0.250%

Average monthly Castle Rock temperature with heat index

Castle Rock monthly precipitation with daily maximum

Castle Rock monthly snow depth with daily maximum

Castle Rock monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Clatskanie, OR	2,189	18	64.0%
Longview Heights, WA	4,388	18	64.0%
West Side Highway, WA	5,735	18	64.0%
Rainier, OR	2,080	18	64.0%
Ryderwood, WA	401	18	64.0%
Castle Rock, WA	2,917	18	64.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Heritage Lake, IN	2,917	54	8.0%
Chaffee, MO	2,917	44	12.0%
Seaside Heights, NJ	2,917	41	18.0%
University Park, NM	2,917	51	2.0%
Peace River E, BC	2,917	n/a
Castle Rock, WA	2,917	18	64.0%

Source: The Castle Rock, WA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.