Chicago, IL

Weather Forecast Office

Rockford, IL Temperature Records

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

Last Updated 12/3/2022

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
June 21, 2022	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 (these values are not activity updated after 2013)

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 (these values are not activity updated after 2013)

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)

-30	January 31, 2019
-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
	January 30, 2019	-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		February11, 2014
	January 23, 1963		January 26, 2019

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

-19	January 18, 1994	-13	January 7, 1942
	January 30, 2019		January 6, 1988
-18	January 5, 1924		January 6, 2014
	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
	January 31, 2019
-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 7^th
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 19^th
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)