Grand Coulee, WA Weather - Forecast & Monthly Averages

TEMPERATURE	38
HUMIDITY	91
PRESSURE
WIND COND.	106 12.9

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Weather Quick Facts

The highest monthly average temperature in Grand Coulee for July is 75.4 degrees
The lowest monthly average temperature in Grand Coulee for January is 23.9 degrees
The most monthly precipitation in Grand Coulee occurs in June with 4.2 inches
The air quality index in Grand Coulee is 57% better than the national average
The pollution index in Grand Coulee is 2% better than the national average

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Grand Coulee 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	18°F	30°F	24°F	1.2"
February	25°F	44°F	33°F	2.4"
March	31°F	57°F	43°F	1.8"
April	35°F	65°F	50°F	1.5"
May	42°F	75°F	59°F	2.6"
June	49°F	80°F	64°F	4.2"
July	58°F	92°F	75°F	1.6"
August	54°F	91°F	73°F	0.8"
September	45°F	78°F	61°F	2.2"
October	37°F	61°F	48°F	2.3"
November	27°F	41°F	34°F	3.6"
December	18°F	30°F	25°F	4.0"

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Grand Coulee 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	Grand Coulee	Washington	National
Air quality index	18	36	42
Pollution index	2,683,410	4,541,850	2,726,193

Grand Coulee air quality

Measurement	Total
Days measured	365
Days with good air quality	339
Days with moderate air quality	26
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.040%
Carbon Tetrachloride	0.004%
Lead	0.030%
Mercury	0.000%

Average monthly Grand Coulee temperature with heat index

Grand Coulee monthly precipitation with daily maximum

Grand Coulee monthly snow depth with daily maximum

Grand Coulee monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Coulee Dam, WA	1,355	18	64.0%
Wilbur, WA	767	18	64.0%
Electric City, WA	944	18	64.0%
Elmer City, WA	301	18	64.0%
Keller, WA	204	43	14.0%
Grand Coulee, WA	1,257	18	64.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Edgerton, MN	1,257	36	28.0%
Mansfield, MO	1,257	39	22.0%
Union Springs, NY	1,257	34	32.0%
Hilldale, PA	1,257	38	24.0%
Prosperity, SC	1,257	43	14.0%
Grand Coulee, WA	1,257	18	64.0%

Source: The Grand Coulee, 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.