April 2010 will be remembered as one of the warmest on record across central and southeast Illinois.  While few daily record high temperatures were set, most days saw both high and low temperatures well above normal.  The official climate sites at Peoria and Springfield set their warmest April on record.  Records at these sites date back to the late 1800s.  Lincoln, IL had the 7th warmest
April on record in the past 105 years.

The average temperature for April 2010 in Peoria was 59.1 degrees. 
Here are the 10 warmest Aprils on record:

RANK   AVG TEMP     YEAR(S)
 1      59.1        2010
 2      58.8        1915
 3      58.6        1955
 4      57.8        1925
 5      57.7        2001
 6      57.2        1886
 7      57.0        1977
 8      56.9        1985
 9      56.3        1942, 2006
10      56.1        1941

Records for Peoria date back to 1883

The average temperature for the month of April for Springfield was 60.9 degrees.
Here are the 10 warmest Aprils on record:

RANK   AVG TEMP     YEAR(S)
 1      60.9        2010
 2      60.4        1981
 3      60.0        1896, 1915
 4      59.9        1977
 5      59.8        1955
 6      59.4        1925, 2001
 7      58.4        1942
 8      58.3        1941
 9      58.2        2006
10      57.8        1985

Records for Springfield date back to July 1879

The average temperature for April 2010 in Lincoln, IL was 57.7 degrees. 
Here are the 10 warmest Aprils on record:

RANK   AVG TEMP     YEAR(S)
 1      59.6        1955
 2      59.5        1915
 3      59.4        1977
 4      59.0        1981
 5      58.8        1925
 6      58.0        1954
 7      57.7        2010
 8      57.2        2001
 9      57.0        1942, 1948
10      56.9        1906, 1941, 1959

Records for Lincoln date back to 1905



The map below, courtesy of NOAA MRCC, shows how widespread the above normal temperatures were across the Midwest.

After a very dry start to the month, a change in the jet stream brought a much more active weather pattern for the last week of April.  Multiple strong low pressure systems brought locally heavy rainfall and several rounds of strong to severe thunderstorms.  To see storm reports for a specific day, visit the Storm Prediction Center's Severe Weather Event Summaries page.  For the month as a whole, above normal rainfall was recorded across the west-central portions of the state, while much drier conditions were found farther east.


Click the links below to see more detailed April climate summaries for specific cities.  Only the summaries for Peoria, Springfield, and Lincoln are considered to be official climatological summaries, while the remaining sites provide supplemental data.


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