Spearfish, SD Weather - Forecast & Monthly Averages

TEMPERATURE	55
HUMIDITY	38
PRESSURE
WIND COND.	30 14.8

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Weather Quick Facts

The highest monthly average temperature in Spearfish for July is 74.8 degrees
The lowest monthly average temperature in Spearfish for December is 24.3 degrees
The most monthly precipitation in Spearfish occurs in August with 6.4 inches
The air quality index in Spearfish is 5% worse than the national average
The pollution index in Spearfish is 82% better than the national average

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Spearfish 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	38°F	26°F	0.8"
February	16°F	40°F	27°F	1.2"
March	26°F	53°F	38°F	2.5"
April	33°F	59°F	45°F	4.6"
May	43°F	68°F	55°F	6.2"
June	54°F	81°F	67°F	5.1"
July	61°F	89°F	75°F	3.4"
August	59°F	87°F	72°F	6.4"
September	50°F	79°F	63°F	4.3"
October	37°F	63°F	49°F	5.6"
November	25°F	51°F	37°F	3.2"
December	14°F	36°F	24°F	1.6"

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Spearfish 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	Spearfish	South Dakota	National
Air quality index	44	36	42
Pollution index	486,607	345,623	2,726,193

Spearfish 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	0.010%
Carbon Tetrachloride	0.001%
Lead	0.080%
Mercury	0.001%

Average monthly Spearfish temperature with heat index

Spearfish monthly precipitation with daily maximum

Spearfish monthly snow depth with daily maximum

Spearfish monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Fruitdale, SD	97	44	12.0%
Deadwood, SD	1,584	44	12.0%
Sturgis, SD	6,914	44	12.0%
Nisland, SD	209	44	12.0%
Lead, SD	2,979	44	12.0%
Spearfish, SD	11,702	44	12.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Crossville, TN	11,704	53	6.0%
Little Chute, WI	11,704	37	26.0%
El Campo, TX	11,695	31	38.0%
Smyrna, DE	11,694	42	16.0%
Salem, OH	11,692	42	16.0%
Spearfish, SD	11,702	44	12.0%

Source: The Spearfish, 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.