TODAY DEC10
TEMPERATURE23
HUMIDITY85
PRESSURE30.26
WIND COND.320 3.4
  • 3320Mon
  • 3624Tue
  • 3831Wed50%
  • 4132Thu40%30%
  • 4233Fri60%50%
daynightWeather update from Fort Wayne International Airport at

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Decatur 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
January17°F35°F26°F2.9"
February18°F37°F27°F2.4"
March28°F51°F39°F3.1"
April38°F65°F51°F4.0"
May49°F75°F62°F4.9"
June59°F84°F71°F5.1"
July62°F86°F74°F4.1"
August60°F84°F72°F4.4"
September53°F79°F65°F3.3"
October42°F67°F53°F2.9"
November31°F53°F42°F3.2"
December23°F39°F31°F3.1"

Did you know?

  • The highest monthly average temperature in Decatur for July is 74 degrees.
  • The lowest monthly average temperature in Decatur for January is 26 degrees.
  • The most monthly precipitation in Decatur occurs in June with 5.1 inches.
  • The air quality index in Decatur is 5% better than the national average.
  • The pollution index in Decatur is 81% better than the national average.

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Compare Decatur, IN Weather To Other Cities

Decatur 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.
IndexDecaturIndianaNational
Air quality index475650
Pollution index951,4943,773,6185,066,862

Decatur air quality information

MeasurementTotal
Days measured365
Days with good air quality219
Days with moderate air quality145
Days w/ poor A.Q. for sensitive groups1
Days with unhealthy air quality

Decatur air quality information

PollutantTotal
Arsenic0.002%
Benzene0.020%
Carbon Tetrachloride0.002%
Lead0.010%
Mercury0.000%

Average monthly Decatur temperature with heat index

Decatur monthly precipitation with daily maximum

Decatur monthly snow depth with daily maximum

Decatur monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Rockford, OH1,1723040%
Bluffton, IN9,7023334%
Vera Cruz, IN1093334%
Berne, IN3,982476%
Monroeville, IN1,156476%
Decatur, IN9,384476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Rockcreek, OR9,3843824%
New Albany, OH9,3844314%
Rochelle, IL9,3853138%
Tomah, WI9,3804020%
Clarksville, AR9,3913530%
Decatur, IN9,384476%
Source: The Decatur, IN 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.