Damaging High Winds and Critical Fire Weather Threats in California

A strong low pressure center off the southern California Coast will produce high winds in the Sierra-Nevada mountains, and central and southern coastal ranges. Very dry conditions combined with these high winds will produce critical fire weather threats in the central and southern coastal ranges. Heavy snow in the South and Central Rockies, and Great Lakes; and heavy rain in Hawaii will continue. Read More >

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Chicago
Rockford

Weather Observations for the City of Chicago

Official Climate Sites

Location	Occupied From	Occupied To	Remarks
181 W Washington St (formerly 162 Washington St)	10/15/1870	10/08/1871	Station abandoned October 8, 1871 in Great Chicago Fire – all records lost.
427 W Randolph St (10 W Randolph prior to 1909)	10/15/1871	6/11/1872	Room rented October 14, regular observations resumes October 16
20 N Wacker Drive (80 S Market prior to 1909)	6/11/1872	6/08/1873
Roanoke Building (formerly Major Block) SE Corner Madison and LaSalle Street)	6/08/1873	1/01/1887
Chicago Opera House SW Corner Clark and Washington	1/01/1887	2/01/1890
Auditorium Tower NE Corner Wabash and Congress	2/01/1890	7/01/1905	Automatic Recording Rain gage installed 1897
U.S. Court House 219 S Dearborn St.	7/01/1905	12/31/1925	Maintained Supplemental Observations through October 15, 1970
University of Chicago Rosenwald Hall 58th St and University Ave	1/01/1926	6/30/1942	Maintained Supplemental Observations through March 31, 1962
Midway Airport South Terminal Building 6200 South Cicero Ave	7/01/1942	1/17/1980	Supplemental Observations were transferred to station Midway 3SW
O’Hare International Airport International Terminal Building	1/17/1980	3/07/1985
O’Hare International Airport Hardstand Operational Building	3/07/1985	1/19/1989
O’Hare International Airport O’Hare Corporate Tower, Rosemont	1/19/1989	2/01/1996
O’Hare International AP	2/01/1996	Present	ASOS installed

Additional Climate records (but not official for Chicago)

Location	Occupied From	Occupied To	Remarks
U.S. Court House 219 S Dearborn St.	1/01/1926	10/15/1970	Previously was official site for Chicago. Observations continued local site’s climate record.
University of Chicago Rosenwald Hall 58th St and University Ave	1/01/1916 and 7/01/1942	12/31/1925 and 3/31/1962	Temporarily was official site for Chicago. Observations continued local site’s climate record.
University of Chicago 5730 S Woodlawn Avenue	4/01/1962	10/31/1994	Previously was official site for Chicago. Observations continued local site’s climate record.
Midway Airport National Airtransport Hangar 5490 South Cicero Ave	2/13/1928	11/03/1932
Midway Airport South Terminal Building 6200 South Cicero Ave	11/03/1932	6/30/1942	Continuation of MDW climate record. Became official cite for Chicago on 7/01/1942.
Midway 3SW Cooperative Observer	1/18/1980	Present	Continuation of MDW climate records after official Chicago site was transferred to O’Hare
O’Hare International Airport International Terminal Building	10/30/1958	1/16/1980	Beginning of ORD climate records. Became official site for city of Chicago on 1/17/1980

Weather Observations for the City of Rockford

Official Climate Sites

Location	Occupied From	Occupied To	Remarks
900 Block, North Main	12/??/1872	10/??/1893	Cooperative Observer, T. D. Robertson (rainfall only)
731 North Court Street	11/??/1893	12/??/1912	Cooperative Observer, H. C. Porter (rainfall only)
1135 North Court Street	1/??/1913	6/01/1918	Cooperative Observer, Dr. John R. Porter (temperature observations added)
731 North Court Street	6/02/1918	7/29/1920	Cooperative Observer, Carson H. Porter
324 Churchill Street	7/30/1920	12/19/1950	Cooperative Observers, F. W. Knowlton and Daughter
Greater Rockford Airport Federal Facilities Building	12/19/1950	7/01/1995	Moved to Airport
Greater Rockford Airport	7/01/1995	Present	ASOS installed

Additional Climate records (but not official for Rockford)

Location	Occupied From	Occupied To	Remarks
324 Churchill Street	12/19/1950	9/23/1953	Cooperative Observers, Previously was official location for Rockford climate files.
2221 North Winnebago	9/24/1953	6/30/1957	Continuation of cooperative observer climate record after observer obtained new residence.

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Damaging High Winds and Critical Fire Weather Threats in California

History of the Chicago and Rockford weather observation sites