Dangerous Heat in the Southwest; Severe Thunderstorms from the Central Plains into the Ohio Valley

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Isolated to widely scattered severe storms are expected across parts of the central and southern High Plains, Great Lakes into the Ohio Valley, and parts of the Ozarks to Lower Mississippi Valley today. Read More >

4th of July Weather for Northern Illinois: Statistics for Chicago and Rockford

Rockford:

The following statistics comprises 112 years of data. Data collection for Rockford was at the Greater Rockford Airport.

To see the daily climate data for Rockford for July 4th's from 1905 to present, click here.

Frequency distribution of high temperatures for Rockford. This dataset shows that the most frequent range of high temperatures on the 4^th of July is in between 80 and 89 degrees, which is the warmest of all the holidays. The normal high for the 4^th is 85 degrees, which falls in the range of the most frequent highs. The record high is 102 degrees set way back in 2012. This is one of three times that the high temperature got above 100 in on the 4^th of July in Rockford’s history. The coldest high temperature on the 4^th is 62 degrees which occurred in 1967. In 2016, the high temperature was 79 degrees.

Frequency distribution of low temperatures for Rockford. This dataset shows that the most frequent range of low temperatures on the 4^th of July is in between 60 and 69 degrees, which is the warmest of all the holidays. The normal low for the 4^th is 63 degrees, which falls in the range of the most frequent lows. The record low is 46 which occurred in 1924 and 1967. The highest low temperature for the 4^th was 77 degrees in 1977. In 2016, the low temperature was 64 degrees.

Frequency distribution of precipitation for Rockford. This dataset shows that the most frequent amount of precipitation recorded on the 4^th of July is 0.00”, which accounts for 55% of the days in the dataset. The next most frequent range is the 0.02” to 0.25” of precipitation. The record amount of rainfall on the 4^th of July occurred in 1973 when 1.36” of rain fell. There have been 3 instances dating back to 1905 where over an inch of rain fell on the 4^th of July. In 2016, no rain fell.

ADDITIONAL 4th OF JULY CLIMATE DATA ( * MEANS LAST OCCURRENCE)

MAX TEMP WARMEST	MIN TEMP WARMEST	PCPN WETTEST
102 2012	77 1977	1.36 1973
101 1911	76 1999	1.25 1935
100 1921	75 2012	1.05 1925
96 1949	73 1993 *	0.93 1995
95 1990 *	72 1955 *	0.89 1994
94 1977 *	71 1966 *	0.68 1985
93 2002 *	70 2003 *	0.55 1932
92 1999 *	69 2004 *	0.49 1907
91 2003 *	68 2002 *	0.43 1961
90 2011	67 2010 *	0.40 1942

MAX TEMP COLDEST	MIN TEMP COLDEST	PCPN DRIEST
62 1967	46 1967 *	0.00 2016 *
66 1961 *	48 1940 *	T 1993 *
68 1972	49 1941 *	0.01 2010 *
69 1997 *	50 1972 *	0.02 2000 *
70 2009 *	51 2008 *	0.03 1998 *
73 1920 *	52 2014 *	0.04 1937
74 1998 *	53 1916 *	0.05 2003
75 1956 *	54 1907	0.07 1939 *
76 1932	55 1997 *	0.08 1997
77 2005 *	56 2013 *	0.10 1991 *

Updated 6/24/2017

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Dangerous Heat in the Southwest; Severe Thunderstorms from the Central Plains into the Ohio Valley

Climate Data for Chicago and Rockford on the 4th of July