National Weather Service United States Department of Commerce

Rockford’s Temperature Records
(Rockford Coop Station 1905 – 1950;
Rockford Municipal Airport 1951 – present)

 

Rockford's 100 Degree or Greater Days
Daily high temperatures of 100 degrees or greater recorded in Rockford
(from earliest to most recent).

Date Temperature
August 5, 1896 100
July 9, 1897 100
July 4, 1911 101
July 5, 1911 100
July 6, 1911 102
June 30, 1913 100
July 31, 1913  101 
September 3, 1913  100 
July 28, 1916  103 
July 29, 1916  104 
July 30, 1916  104 
July 31, 1916  105 
August 5, 1916  102 
August 19, 1916 100
August 21, 1916 100
July 31, 1917 101
August 1, 1917 100
August 5, 1918 104
August 6, 1918 102
August 7, 1918 101
 July 4, 1921 100
July 7, 1921 100
July 11, 1921 104
July 12, 1921 103
July 13, 1921 104
September 6, 1922 102
September 7, 1922 100
September 8, 1922  101 
June 24, 1923  100 
September 4, 1925 101 
September 5, 1926  100 
July 19, 1930  100 
July 20, 1930  102 
July 27, 1930 100 
August 3, 1930  100 
June 26, 1931  100 
June 28, 1931  100 
June 29, 1931  103 
June 30, 1931  102 
July 1, 1931  101 
July 28, 1931  100 
 July 15, 1932  100 
June 20, 1933  100 
June 27, 1933  103 
May 31, 1934  106 
June 1, 1934  106 
June 3, 1934  100 
June 28, 1934  103 
July 20, 1934  101 
July 21, 1934 102 
July 22, 1934  104 
July 23, 1934  104 
July 24, 1934  107 
July 25, 1934  105 
August 9, 1934  100 
July 30, 1935  100 
1*July 6, 1936  102 
1*July 7, 1936  105 
1*July 8, 1936  104 
1*July 9, 1936  101 
1*July 10, 1936  106 
1*July 11, 1936  108 
1*July 12, 1936  109 
1*July 13, 1936  110 
1*July 14, 1936  112 
*July 16, 1936  100 
*July 17, 1936  104 
*July 26, 1936  103 
*August 9, 1936  100 
*August 18, 1936  101 
 *August 22, 1936  101 
August 16, 1937  102 
September 7, 1939  103 
September 14, 1939  101 
September 15, 1939  102 
July 23, 1940  100 
July 24, 1940  100 
July 25, 1940  104 
July 28, 1941  100 
July 29, 1941  102 
August 11, 1941  101 
August 6, 1947  100 
August 18, 1947  100 
August 19, 1947  100 
August 20, 1947  100
August 23, 1947  101 
August 24, 1947  102 
August 24, 1948  100 
August 31, 1953  101 
September 1, 1953  102 
September 2, 1953  101 
July 26, 1955  102 
July 27, 1955  103 
August 21, 1955  100 
2July 1, 1956  100 
2June 20, 1988 101
June 21, 1988 100
June 25, 1988 101
July 15, 1988 102
August 1, 1988 101
August 16, 1988 104
August 17, 1988 102
July 10, 1989 100
July 19, 2011 100
July 20, 2011 100
June 28, 2012 100
July 4, 2012 102
July 5, 2012 102
July 6, 2012 104
July 7, 2012 105
July 17, 2012 100

1 Greatest number of consecutive 100 degree days (9)

*Greatest number of 100 degree days in one year (15)
2Marks a 33 year period in which temperatures did not climb to 100 degrees

 

Number of Days of 100 Degrees or More by Decade

 1893 – 1899  2
 1900 – 1909  0
 1910 – 1919  18
 1920 – 1929  11
 1930 – 1939  44
 1940 – 1949  13
 1950 – 1959  7
 1960 – 1969  0
 1970 – 1979  0
 1980 – 1989  8
 1990 – 1999  0
 2000 - 2009  0
 2010 - 2019  8

 

Greatest Consecutive Number of Days in Each Year with Maximum Temperature 90 Degrees or Higher

                                
1895...6 1896...9 1897...8 1898...5 1899...5 1900...M
1901...M 1902...M 1903...3 1904...M 1905...5 1906...3
1907...1 1908...3 1909...2 1910...5 1911...6 1912...2
1913...8 1914...6 1915...1 1916...21 1917...4 1918...4
1919...6 1920...3 1921...21 1922...8 1923...7 1924...2
1925...8 1926...4 1927...5 1928...3 1929...10 1930...5
1931...9 1932...11 1933...8 1934...8 1935...11 1936...13
1937...10 1938...4 1939...7 1940...8 1941...13 1942...5
1943...7 1944...7 1945...4 1946...M 1947...13 1948...10
1949...7 1950...3 1951...2 1952...3 1953...11 1954...3
1955...10 1956...6 1957...3 1958...2 1959...8 1960...5
1961...5 1962...3 1963...4 1964...3 1965...2 1966...4
1967...3 1968...5 1969...2 1970...4 1971...3 1972...3
1973...4 1974...3 1975...5 1976...3 1977...4 1978...5
1979...1 1980...2 1981...2 1982...1 1983...10 1984...2
1985...2 1986...4 1987...10 1988...9 1989...9 1990...3
1991...7 1992...2 1993...2 1994...5 1995...8 1996...4
1997...2 1998...4 1999...5 2000...3 2001...6 2002...5
2003...3 2004...1 2005...7 2006...3 2007...4 2008...2
2009...4 2010...2 2011...5 2012...10 2013...5   

 

Greatest Consecutive Number of Days with Maximum Temperature 90 Degrees or Higher

21 days:
     July 12 - August 1, 1916
     June 28 - July 18, 1921
13 days:
     July 6 - July 18, 1936
     July 23 - August 4, 1941
     August 2 - August 14, 1947

 

 Greatest Number of Days with Maximum Temperature 90 Degrees or Higher in Any Year

1.....62 days (1921) 7.....45 days (1933)
2.....53 days (1895) 8.....44 days (1931)
3.....52 days (1934) 9.....42 days (1916)
4.....49 days (1936) 10...40 days (1941, 1947, and 1945)
5.....46 days (1937 and 1988)  

 * Normally there are 15 days where the maximum temperature reaches at least 90 degrees at Rockford.

 

Greatest Number of Days with Maximum Temperature 90 Degrees or Higher by Month 

April..... 2 days (1930) August.....         24 days (1947)
May.....  10 days (1934) September..... 11 days (1895 and 1939)
June.....20 days (1933) October.....         4 days (1922)
July.....  27 days (1921)  

 

Least Number of Days with Maximum Temperature 90 Degrees or Higher in Any Year

1 day (1915 and 2004) 4 days (1967, 2000 and 2009)
2 days (1979 and 2008) 5 days (1907, 1969, and 1996)
3 days (1951, 1981, and 1982)  

 

Highest Temperatures Recorded in Rockford (102 degrees and higher)

112 July 14, 1936
110 July 13, 1936
109 July 12, 1936
108 July 11, 1936
107 July 24, 1934
106 May 31, 1934
June 1, 1945
July 10, 1936
105 July 31, 1916
July 25, 1934
July 7, 1936
July 7, 2012
104 July 29, 1916
July 30, 1916
August 5, 1918
July 11, 1921
July 13, 1921
July 22, 1934
July 23, 1934
July 8, 1936
July 17, 1936
July 25, 1940
August 16, 1988
July 6, 2012
103 July 28, 1916
July 12, 1921
June 29, 1931
June 27, 1933
June 28, 1934
July 26, 1936
September 7, 1939
July 27, 1955
102 July 6, 1911
August 5, 1916
August 8, 1918
September 6, 1922
July 20, 1930
July 30, 1931
July 21, 1934
July 6 1936
August 16, 1937
September 15, 1939
July 29, 1941
August 24, 1947
September 1, 1953
July 26, 1955
July 15, 1988
August 17, 1988
July 4, 2012
July 5, 2012

 

Highest Daily Mean Temperatures Recorded in Rockford
(88 degrees and higher)

93 July 14, 1936
92 July 12, 1936
July 13, 1936
91 August 6, 1918
July 24, 1934
July 11, 1936
July 6, 2012
90 July 30, 1916
July 31, 1916
July 22, 1934
July 25, 1934
July 10, 1936
September 7, 1939
July 25, 1940
July 7, 2012
89 July 5, 1911
July 29, 1916
June 29, 1931
July 29, 1941
July 27, 1955
August 16, 1988
August 17, 1988
July 20, 2011
July 4, 2012
88 July 31, 1913
July 28, 1916
August 7, 1916
August 7, 1918
August 3, 1930
August 4, 1930
June 28, 1931
June 30, 1931
July 1, 1931
July 15, 1932
July 21, 1932
July 23, 1934
August 22, 1936
July 28, 1941
August 18, 1947
August 24, 1947
July 26, 1955
July 23, 1965
August 1, 1988
August 15, 1988
July 9, 1989
July 21, 2002
July 19, 2011
July 5, 2012

 

Greatest Consecutive Number of Days in Each Year with Minimum Temperature Zero Degrees or Lower

1905...M 1906...1 1907...5 1908...3 1909...6 1910...7
1911...5 1912...17  1913...3 1914...5  1915...5  1916...5 
1917...6 1918...8 1919...4 1920...5  1921...1  1922...3 
1923...3  1924...6  1925...4  1926...3  1927...4  1928...1 
1929...5  1930...3  1931...1  1932...4  1933...6  1934...2 
1935...4  1936...8  1937...1  1938...2  1939...1  1940...4 
1941...3  1942...9  1943...3  1944...2  1945...5  1946...M 
1947...M  1948...4  1949...2  1950...5  1951...7  1952...3 
1953...3  1954...2  1955...5  1956...3  1957...7  1958...8 
1959...4  1960...3  1961...5  1962...6  1963...13  1964...2 
1965...9  1966...6  1967...4  1968...6  1969...4  1970...8 
1971...4  1972...7  1973...2  1974...4  1975...5  1976...4 
1977...8  1978...11  1979...11  1980...4  1981...4  1982...12 
1983...5  1984...8  1985...6  1986...5  1987...4  1988...7 
1989...7  1990...5  1991...3  1992...2  1993...3  1994...9 
1995...4  1996...8  1997...5  1998...1  1999...4  2000...12 
2001...2  2002...2  2003...2  2004...4  2005...4  2006...2 
2007...8  2008...3  2009...5  2010...4  2011...3  2012...2 
2013...4           

 

Greatest Consecutive Number of Days with Minimum Temperature
Zero or Lower

17 days:
     January 1 - January 17, 1912
     
13 days:
     January 19 - January 31, 1963
     

 

Greatest Number of Days with Minimum Temperature Zero Degrees or Lower in any Year

1.......45 days (1963)
2.......38 days (1977)
3.......37 days (1978)
4.......35 days (1979 and 1985)
6.......34 days (1912)
7.......31 days (1936)
8.......30 days (1929)
9.......28 days (1976)
10......27 days (1917, 1924 and 1951)

*(Normally there are 12 days where the minimum temperature falls to 0 degrees or below at Rockford.)
 

Greatest Number of Days with Minimum Temperature of Zero Degrees or Lower by Month

November..... 3 days (1929, 1950, 1976 and 1977)
December.....15 days (1963)
January..........21 days (1912, 1977)
February.... 18 days (1936)
March.......... 5 days (1943)
 

 

Least Number of Days with Minimum Temperature of Zero Degrees or Lower in any Year

1 day   (1931 and 1939)
2 days (2002 and 2012)
3 days (1906, 1921 and 1998)
5 days (1908, 1937, 1952, 1954, 1956,
1964, 1987, 1992 and 2006)
6 days (1907 and 1928)

 

 

Lowest Temperatures Recorded in Rockford (-21 degrees and lower)

-27

January 10, 1982

-22 (cont)

January 21, 1970

 

 

 

February 2, 1976

-26

January 20, 1985

 

January 16, 1977

 

 

 

January 21, 1984

-25

January 5, 1924

 

February 1, 1985

 

February 9, 1933

 

December 25, 2000

 

January 17, 1982

 

 

 

 

-21

February 1, 1918

-24

January 23, 1936

 

January 4, 1919

 

January 11, 1979

 

January 21, 1924

 

January 15, 1979

 

December 28, 1924

 

January 16, 1982

 

January 22, 1936

 

December 24, 1983

 

January 12, 1974

 

January 19, 1985

 

January 16, 1979

 

January 19, 1994

 

February 5, 1979

 

February 3, 1996

 

January 9, 1982

 

 

 

December 19, 1983

-23

January 25, 1897

 

December 23, 1983

 

December 26, 1914

 

January 10, 1988

 

January 18, 1994

 

January 15, 1994

 

 

 

January 16, 1994

-22

January 28, 1915

 

February 2, 1996

 

February 20, 1929

 

January 5, 1999

 

January 18, 1930

   
 

January 23, 1963

   

 

 

Lowest Daily Mean Temperatures Recorded in Rockford
(-11 degrees and lower)

-19

January 18, 1994

-13

January 7, 1942

 

 

 

January 6, 1988

-18

January 5, 1924

 

 

 

December 24, 1983

-12

January 21, 1970

 

February 3, 1996

 

January 2, 1979

 

 

 

January 17, 1982

-17

January 25, 1987

 

December 19, 1983

 

January 15, 1994

 

January 20, 1984

 

February 2, 1996

 

December 21, 1989

 

 

 

 

-16

January 6, 1912

-11

January 16, 1897

 

February 9, 1933

 

February 2, 1917

 

January 23, 1963

 

December 28, 1924

 

January 10, 1982

 

January 18, 1930

 

December 23, 1983

 

January 18, 1940

 

January 20, 1985

 

January 30, 1951

 

 

 

January 15, 1979

-15

January 24, 1897

 

February 5, 1979

 

January 7, 1912

 

December 22, 1989

 

January 23, 1936

 

January 31, 1996

 

January 29, 1966

 

February 4, 1996

 

January 16, 1977

 

 

 

 

 

 

-14

January 12, 1912

   
 

January 15, 1972

   
 
 
Longest Continuous Period Below Freezing
 

46 days

January 9, 1978 - February 23, 1978

 

 

43 days 

December 28, 1976 - February 8, 1977

 

 

38 days

January 16, 1936 - February 22, 1936

 

 

 33 days

 January 15, 1985 - February 16, 1985

 

 

 30 days

January 1, 1893 - January 30, 1893

 

January 21, 1979 - February 19, 1979

 
 
Longest Consecutive Number of Hours Below Zero
 

120 hours

January 31, 1996 - February 4, 1996

 
 
First Freeze of the Season
 
Average Date: October 7th
Earliest Date: September 13, 1975 (32)
Latest Date: November 4, 1973 (31)
               
 
Last Spring Freeze of the Season
 
Average Date: May 1st
Earliest Date: March 31, 1946 (32)
Latest Date: May 27, 1992 (30)
 
 
First Killing Frost (28 Degrees or Lower)
 
Average Date: October 19th
Earliest Date: September 24, 1976 (28)
Latest Date: November 10, 1994 (28)
 
 
Biggest Range in a Single Calendar Day
High and Low temperature in parentheses
 
53 Degrees: February 12, 1999 (66/13)
     
52 Degrees: March 23, 1939 (82/30)
     
50 Degrees: April 2, 1981 (79/29)
  January 18, 1996 (57/7)
 
 
Largest Temperature Change from One Day to the Next
High and Low temperatures for the days in parentheses
 
Drop of 65 Degrees: January 5-6, 1909 (54/23; 23/-11)
     
Drop of 62 Degrees: November 11-12, 1911 (74/50; 50/12)
     
Drop of 57 Degrees: February 1-2, 1976 ** (35/-9; 7/-22)
  January 18-19, 1996 (57/7; 7/0)
     
Rise of 63 Degrees: April 9-10, 1930 (73/30; 93/50)
     
Rise of 59 Degrees: February 22-23, 1936 (25/-17; 42/22)
  March 17-18, 1976 (37/11; 70/31)
     
Rise of 58 Degrees: January 29-30, 1926 (38/-6; 52/37)
     
Rise of 57 Degrees: January 21-22, 1924 (2/-21; 36/-7)
  March 31-April 1, 2003 (56/24; 81/45)