History of the Chicago and Rockford weather observation sites

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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