First Measurable Snowfall Statistics for Chicago and Rockford

SNOW IS CONSIDERED MEASURABLE WHEN 0.1 INCHES OR MORE HAVE BEEN
RECORDED. THROUGH TODAY...NOVEMBER 25TH...CHICAGO-O'HARE AND
ROCKFORD AIRPORT...THE OFFICIAL CLIMATE SITES FOR CHICAGO AND
ROCKFORD...HAVE ONLY RECORDED A TRACE OF SNOWFALL FOR THE SEASON.
SOME LOCATIONS IN NORTHWEST AND NORTH CENTRAL ILLINOIS DID RECEIVE
SOME MEASURABLE SNOWFALL ON NOVEMBER 9TH AND 10TH BUT CHICAGO AND
ROCKFORD ONLY RECORDED A TRACE. HERE ARE SOME INTERESTING STATS
ABOUT THE LACK OF MEASURABLE SNOWFALL THUS FAR AT BOTH SITES.

...CHICAGO...
...122 YEARS OF RECORDS FOR FIRST DATE OF MEASURABLE SNOWFALL.*
...THE AVERAGE DATE OF FIRST MEASURABLE SNOWFALL IS 11/16.
...75 PERCENT OF THE YEARS HAD RECEIVED MEASURABLE SNOWFALL BY 11/25.
...84 PERCENT OF THE YEARS HAD RECEIVED MEASURABLE SNOWFALL BY 12/1.
...EARLIEST DATE OF FIRST MEASURABLE SNOWFALL:10/12/2006.
...LATEST DATE OF FIRST MEASURABLE SNOWFALL:12/16/1965.

...ROCKFORD...
...102 YEARS OF RECORDS FOR FIRST DATE OF MEASURABLE SNOWFALL.**
...THE AVERAGE DATE OF FIRST MEASURABLE SNOWFALL IS 11/20.
...61 PERCENT OF THE YEARS HAD RECEIVED MEASURABLE SNOWFALL BY 11/25.
...75 PERCENT OF THE YEARS HAD RECEIVED MEASURABLE SNOWFALL BY 12/1.
...EARLIEST DATE OF FIRST MEASURABLE SNOWFALL: 10/12/1909.
...LATEST DATE OF FIRST MEASURABLE SNOWFALL: 1/7/1940.

*  DATA FOR CHICAGO SINCE 1884 WITH 5 MISSING YEARS.
** DATA FOR ROCKFORD SINCE 1905 WITH 4 MISSING YEARS.

LOOKING BACK AT THE 2010-2011 SNOW SEASON...NO MEASURABLE SNOW WAS
RECORDED AT BOTH CHICAGO-O'HARE AND ROCKFORD AIRPORT UNTIL DECEMBER
1ST. IN THE CURRENT FORECAST PERIOD...WET SNOW MAY MIX IN WITH
RAIN SHOWERS LATE SATURDAY NIGHT INTO SUNDAY...BUT NO MEASURABLE
SNOW IS EXPECTED. AFTER THAT...THERE IS A DISTINCT POSSIBILITY
THAT THE FIRST MEASURABLE SNOWFALL OF THE SEASON MAY NOT OCCUR AT
CHICAGO AND ROCKFORD UNTIL AFTER DECEMBER 1ST.

$$

RC


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