Index, WA Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Index for August is 63.5 degrees
The lowest monthly average temperature in Index for December is 39.4 degrees
The most monthly precipitation in Index occurs in November with 5.7 inches
The air quality index in Index is 7% worse than the national average
The pollution index in Index is 1491% worse than the national average

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Index 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	36°F	46°F	41°F	3.8"
February	37°F	49°F	42°F	2.7"
March	39°F	52°F	45°F	4.4"
April	42°F	57°F	48°F	2.8"
May	47°F	64°F	54°F	2.2"
June	51°F	68°F	58°F	1.8"
July	55°F	74°F	63°F	0.7"
August	56°F	75°F	63°F	0.9"
September	53°F	69°F	59°F	2.0"
October	47°F	59°F	52°F	3.6"
November	40°F	51°F	45°F	5.7"
December	35°F	44°F	39°F	4.9"

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Index 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	Index	Washington	National
Air quality index	45	36	42
Pollution index	43,367,400	4,541,850	2,726,193

Index air quality information

Measurement	Total
Days measured	365
Days with good air quality	236
Days with moderate air quality	127
Days w/ poor A.Q. for sensitive groups	2
Days with unhealthy air quality	0

Index air quality information

Pollutant	Total
Arsenic	0.020%
Benzene	0.790%
Carbon Tetrachloride	0.120%
Lead	0.210%
Mercury	0.180%

Average monthly Index temperature with heat index

Index monthly precipitation with daily maximum

Index monthly snow depth with daily maximum

Index monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
May Creek, WA	759	45	10.0%
Baring, WA	205	45	10.0%
North Sultan, WA	265	45	10.0%
Skykomish, WA	127	45	10.0%
Startup, WA	771	45	10.0%
Index, WA	172	45	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Ethelsville, AL	172	35	30.0%
Spring Garden, AL	172	43	14.0%
Greenway, AR	172	26	48.0%
East Nicolaus, CA	172	44	12.0%
Honcut, CA	172	44	12.0%
Index, WA	172	45	10.0%

Source: The Index, 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.