TODAY DEC11
TEMPERATURE24
HUMIDITY81
PRESSURE30.11
WIND COND.230 9.2
  • 3322Tue
  • 3324Wed
  • 3524Thu20%
  • 3621Fri
  • 3823Sat
daynightWeather update from Marshalltown, Marshalltown Municipal Airport at

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Union Average Temperature

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
January12°F28°F20°F1.5"
February14°F30°F22°F2.6"
March29°F50°F38°F5.4"
April38°F62°F50°F7.2"
May51°F73°F61°F8.0"
June62°F83°F72°F7.9"
July63°F85°F74°F5.1"
August62°F82°F72°F6.6"
September55°F79°F66°F5.4"
October44°F65°F54°F5.7"
November28°F49°F38°F2.2"
December13°F26°F20°F1.8"

Did you know?

  • The highest monthly average temperature in Union for July is 74 degrees.
  • The lowest monthly average temperature in Union for December is 20 degrees.
  • The most monthly precipitation in Union occurs in May with 8 inches.
  • The air quality index in Union is 25% better than the national average.
  • The pollution index in Union is 76% better than the national average.

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Compare Union, IA Weather To Other Cities

Union 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.
IndexUnionIowaNational
Air quality index373950
Pollution index1,171,9301,643,8365,066,862

Union air quality information

MeasurementTotal
Days measured214
Days with good air quality210
Days with moderate air quality4
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Union air quality information

PollutantTotal
Arsenic0.060%
Benzene0.010%
Carbon Tetrachloride0.002%
Lead0.004%
Mercury0.050%

Average monthly Union temperature with heat index

Union monthly precipitation with daily maximum

Union monthly snow depth with daily maximum

Union monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
New Providence, IA2733726%
Albion, IA5733726%
Eldora, IA2,6633726%
Hubbard, IA8913726%
Owasa, IA543726%
Union, IA4873726%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Fredonia, KY4873628%
Hometown, WV4873432%
Badger, IA4873726%
Baneberry, TN4873922%
Wainwright, AK4883726%
Union, IA4873726%
Source: The Union, 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.