TODAY AUG14
TEMPERATURE68
HUMIDITY94
PRESSURE30
WIND COND.
  • 8466Tue
  • 7863Wed30%40%
  • 7963Thu20%
  • 7962Fri40%30%
  • 8263Sat
daynightWeather update from Decorah at

Castalia Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January13°F27°F19°F0.5"
February14°F29°F21°F0.4"
March29°F45°F36°F1.5"
April40°F59°F48°F3.4"
May50°F70°F60°F2.9"
June61°F79°F69°F4.3"
July65°F82°F73°F3.9"
August62°F79°F70°F4.0"
September54°F73°F63°F3.4"
October43°F61°F51°F3.0"
November31°F47°F38°F1.0"
December18°F31°F24°F0.9"

Did you know?

  • The highest monthly average temperature in Castalia for July is 73 degrees.
  • The lowest monthly average temperature in Castalia for January is 19 degrees.
  • The most monthly precipitation in Castalia occurs in June with 4.3 inches.
  • The air quality index in Castalia is 19% better than the national average.
  • The pollution index in Castalia is 89% better than the national average.

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Compare Castalia, IA Weather To Other Cities

Castalia 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.
IndexCastaliaIowaNational
Air quality index403950
Pollution index530,4841,643,8365,066,862

Castalia air quality information

MeasurementTotal
Days measured361
Days with good air quality264
Days with moderate air quality97
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Castalia air quality information

PollutantTotal
Arsenic0.000%
Benzene0.010%
Carbon Tetrachloride0.001%
Lead0.002%
Mercury0.000%

Average monthly Castalia temperature with heat index

Castalia monthly precipitation with daily maximum

Castalia monthly snow depth with daily maximum

Castalia monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Monona, IA1,4953236%
St. Olaf, IA1383236%
Postville, IA2,2814020%
Waukon, IA3,7864020%
Decorah, IA7,9854020%
Castalia, IA1884020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Pike, NY1884118%
Mineral, CA1883824%
Stuckey, SC1881570%
Fulton, AL1883138%
Moorefield, AR188476%
Castalia, IA1884020%
Source: The Castalia, 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.