Keystone, SD Weather - Forecast & Monthly Averages

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TEMPERATURE	70
HUMIDITY	39
PRESSURE
WIND COND.	260 18.4

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Weather Quick Facts

The highest monthly average temperature in Keystone for July is 67.4 degrees
The lowest monthly average temperature in Keystone for December is 23.4 degrees
The most monthly precipitation in Keystone occurs in May with 3.3 inches
The air quality index in Keystone is 5% worse than the national average
The pollution index in Keystone is 28% better than the national average

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Keystone 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	15°F	37°F	25°F	0.4"
February	14°F	36°F	24°F	0.6"
March	23°F	48°F	34°F	1.0"
April	28°F	53°F	39°F	2.4"
May	37°F	61°F	48°F	3.3"
June	47°F	74°F	60°F	2.9"
July	53°F	82°F	67°F	2.7"
August	51°F	80°F	65°F	2.4"
September	43°F	72°F	56°F	1.7"
October	32°F	57°F	43°F	1.3"
November	23°F	46°F	34°F	0.6"
December	13°F	35°F	23°F	0.7"

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Keystone 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	Keystone	South Dakota	National
Air quality index	44	36	42
Pollution index	1,968,790	345,623	2,726,193

Keystone air quality

Measurement	Total
Days measured	365
Days with good air quality	274
Days with moderate air quality	87
Days w/ poor A.Q. for sensitive groups	4
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.003%
Benzene	0.030%
Carbon Tetrachloride	0.004%
Lead	0.020%
Mercury	0.010%

Average monthly Keystone temperature with heat index

Keystone monthly precipitation with daily maximum

Keystone monthly snow depth with daily maximum

Keystone monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Hill City, SD	587	44	12.0%
Colonial Pine Hills, SD	2,720	44	12.0%
Johnson Siding, SD	658	44	12.0%
Custer, SD	2,314	44	12.0%
Rapid City, SD	76,541	44	12.0%
Keystone, SD	542	44	12.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Fonda, IA	542	37	26.0%
Hayden, IN	542	35	30.0%
Barlow, KY	542	44	12.0%
Ethel, MS	542	33	34.0%
Odessa, NY	542	34	32.0%
Keystone, SD	542	44	12.0%

Source: The Keystone, SD 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.