Halloween Weather for Northern Illinois:   Statistics for Chicago and Rockford

 

Rockford:
The following statistics comprises 108 years of data. Data collection for Rockford was at the Greater Rockford Airport.

Graph of high temperatures at Rockford on Halloween
Frequency distribution of high temperatures for Rockford. This dataset shows that the most frequent range of high temperatures on Halloween is in between 50 to 59 degree range, with a close 2nd being the 40-49 degree range. The normal high for Halloween is 56 degrees, which falls in the range of the most frequent highs. The record high is 84 degrees which was set in 1950. This is one of three times that the high temperature reached the 80s on Halloween in Rockford’s history. The coldest high temperature on Halloween is 32 degrees which occurred in 1917. In 2013, the high temperature on Halloween was 63 degrees.

Low Temperatures on Halloween at Rockford
Frequency distribution of low temperatures for Rockford. This dataset shows that the most frequent range of low temperatures on Halloween is in between 40 and 49 degrees. The normal low for Halloween is 37 degrees, which falls in the range of the second most frequent lows. The record low is 14 degrees which occurred in 1925. The highest low temperature for Halloween was 62 degrees in 1974. In 2013, the low temperature on Halloween was 44.

Graph of precipitation at Rockford on Halloween

Frequency distribution of precipitation for Rockford. This dataset shows that the most frequent amount of precipitation recorded on Halloween is 0.00”, which accounts for 56% 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 Halloween occurred in 1919 when 2.51” of rain fell. There have been 3 instances dating back to 1905 where over an inch of rain fell on Halloween. In 2013, there was 0.79" of precipitation.

There have been four instances in Rockford’s history where snow has fallen on Halloween, but there has never been a measurable amount. The last time that it has snowed on Halloween was in 1935 when a Trace of snow fell.

ADDITIONAL HALLOWEEN CLIMATE DATA  ( * MEANS LAST OCCURRENCE)

MAX TEMP
WARMEST

MIN TEMP
WARMEST
PCPN
WETTEST
SNOW
84
1950
62
1974
2.51
1919
T
1935 *
80
1935
54
1950 *
1.37
1960
0.0
2013 *
77
1944
53
1935
1.17
1985
 
75
1974 *
52
1997 *
0.80
1936
73
2000 * 
51
1981
0.79
2013
 
MAX TEMP
COLDEST
MIN TEMP
COLDEST
PCPN
DRIEST
32
1917
14
1925
0.00
2012 *
36
1996
18
1917
T
2009 *
38
1951 *
21
1923 *
0.02
1982 *
41
2002
22
1930
0.03
1933 *
42
1995 *
24
1993
0.05
1920

 

Updated 10/13/2014 ACS


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