Halloween Climate Data for Rockford

Halloween Weather for Northern Illinois: Statistics for Chicago and Rockford

Rockford:
The following statistics comprises 103 years of data. Data collection for Rockford was at the Greater Rockford Airport.

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. The normal high for Halloween is 54 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. Last year, the high temperature was 63 degrees, which is in the third most common range of high temperatures.

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 35 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. Last year, the low temperature was 40 degrees, which is in the most common range of low temperatures.

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 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 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. Last year, there was no precipitation that fell on Halloween

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

MAX TEMP WARMEST	MIN TEMP WARMEST	PCPN WETTEST	SNOW
84 1950	62 1974	2.51 1919	T on many occasions
80 1935	54 1929,1948,1950	1.37 1960	0.0 on many occassions
77 1944	53 1935	1.17 1985
75 1914,1915,1968 1974	52 1921,1982,1997	0.80 1936
73 1990, 2000	51 1981	0.78 1984
71 1909,1924,1952	50 1927,1977,1998	0.70 1935
70 1927,1956,1979	49 1909,1944,1956 2000	0.60 1994
68 1948,1982,1999	48 1933,1979	0.47 1969
67 1938,1940,1964 1997	46 on many occassions	0.46 1929
66 1922,1958,1981 1986	44 1959,1967,1969 2001,2004	0.38 1973

MAX TEMP COLDEST	MIN TEMP COLDEST	PCPN DRIEST
32 1917	14 1925	0.00 on many occassions
36 1996	18 1917	T on many occassions
38 1906,1951	21 1913,1923	0.02 1907,1982
41 2002	22 1930	0.03 1917,1933
42 1911,1954,1995	24 1993	0.05 1920
43 1913,1925,1930 1993	25 on many occassions	0.07 1931,1959,1987
44 on many occassions	26 2002	0.08 1967
45 1928,1939	27 1906,1954	0.10 1921
46 1962,1970,1994	29 1928,1945,1951 1980	0.14 1911,1912
47 1967,1972,1989	30 1992,2006	0.15 1943,1963

Updated 10/28/2008

National Weather Service Weather Forecast Office