St. Marys, IA Weather - Forecast & Monthly Averages

TEMPERATURE	20
HUMIDITY	92
PRESSURE	102440
WIND COND.	150 14.8

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Weather Quick Facts

The highest monthly average temperature in St. Marys for July is 77.4 degrees
The lowest monthly average temperature in St. Marys for January is 23.5 degrees
The most monthly precipitation in St. Marys occurs in June with 6.5 inches
The air quality index in St. Marys is 7% better than the national average
The pollution index in St. Marys is 86% better than the national average

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St. Marys 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	14°F	35°F	23°F	0.9"
February	17°F	39°F	26°F	1.2"
March	30°F	54°F	41°F	2.2"
April	41°F	67°F	53°F	4.9"
May	51°F	76°F	63°F	4.9"
June	62°F	86°F	74°F	6.5"
July	66°F	89°F	77°F	4.2"
August	64°F	87°F	75°F	5.1"
September	56°F	81°F	68°F	3.7"
October	43°F	68°F	55°F	3.2"
November	31°F	54°F	42°F	1.8"
December	18°F	38°F	27°F	2.1"

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St. Marys 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	St. Marys	Iowa	National
Air quality index	39	39	42
Pollution index	376,148	1,154,535	2,726,193

St. Marys air quality

Measurement	Total
Days measured	365
Days with good air quality	306
Days with moderate air quality	59
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.010%
Carbon Tetrachloride	0.001%
Lead	0.001%
Mercury	0.000%

Average monthly St. Marys temperature with heat index

St. Marys monthly precipitation with daily maximum

St. Marys monthly snow depth with daily maximum

St. Marys monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
East Peru, IA	142	39	22.0%
Truro, IA	534	39	22.0%
Winterset, IA	5,309	39	22.0%
St. Charles, IA	787	39	22.0%
Indianola, IA	15,921	39	22.0%
St. Marys, IA	182	39	22.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Fort Green, FL	182	36	28.0%
Green Mountain, IA	182	39	22.0%
Berlin, IL	182	40	20.0%
Minden City, MI	182	26	48.0%
Woodland, MS	182	39	22.0%
St. Marys, IA	182	39	22.0%

Source: The St. Marys, IA 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.