National Weather Service United States Department of Commerce

Halloween Weather for Northern Illinois:   Statistics for Chicago and Rockford

 

Chicago:


The following statistics comprises 148 years of data. Data collection began at the University of Chicago, then at Midway, and currently at O'Hare which is now the official station for Chicago.

To see the daily climate data for Chicago for Halloween from 1872-Present, click here.

 

High Temperatures in Chicago on Halloween
Frequency distribution of high temperatures for Chicago. This dataset shows that the most frequent range of high temperatures on Halloween is in between 50 and 59 degrees. The normal high for Halloween is 56 degrees, which falls in the range of the most frequent highs. The record high is 84 degrees set in 1950. This was the only time in Chicago’s history that the high temperature on Halloween was in the 80s. The coldest high temperature on Halloween is 31 degrees which occurred in 1873.

 

Low temperatures at Chicago on Halloween
Frequency distribution of low temperatures for Chicago. 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 39 degrees, which falls in the range of the second most frequent lows. The record low is 23 which occurred in 1873. The highest low temperature for Halloween was 65 degrees in 1974. 

 

Graph of amount of precipitation on Halloween at Chicago

Frequency distribution of precipitation for Chicago. This dataset shows that the most frequent amount of precipitation recorded on Halloween is 0.00”, which accounts for 51% of the days in the dataset. The next most frequent range is the 0.02” to 0.25”, closely followed by a trace of precipitation. The record amount of rainfall on Halloween occurred in 1994 when 2.26” of rain fell. There have been 3 instances dating back to 1872 where an inch or more of rain fell on Halloween.

There have been eight instances in Chicago’s history where snow has fallen on Halloween, with the only dates of measurable snow being on Halloween in 2014 and 2019.

ADDITIONAL HALLOWEEN CLIMATE DATA  ( * MEANS LAST OCCURRENCE)

MAX TEMP
WARMEST

MIN TEMP
WARMEST
PCPN
WETTEST
SNOW
84
1950
65
1974
2.26
1994
3.4
2019
79
1944
61
1900
1.27
1941
0.1
2014
78
1935 *
59
1933
1.04
2013
T
1993*
77
1974 *
58
1950 *
0.77
2015
76
1915 *
56
1909
0.75
1912
 
MAX TEMP
COLDEST
MIN TEMP
COLDEST

 
31
1873
23
1873

 
32
1917
24
1917

 
33
2019
25
2019*

 
37
1878
26
1996 *

 
39
1930 *
27
1913

 

 

Updated 10/25/2020