Storms in the Plains; Heat Wave to Begin in the Northern Tier

A slow moving weather system will bring potential for scattered strong to severe storms with damaging wind and hail with areas of locally heavy rain in the South and Central Plains through Monday. A heat wave is expected to begin across the Northern Plains, Upper Midwest, and northern Great Basin with temperatures reaching over 20 degrees above normal in some areas. Read More >

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Valentines Day Weather for Northern Illinois: Statistics for Chicago and Rockford

Chicago:
The following statistics comprises 145 years of data. However snowfall data started in 1885 so it comprises 133 years. Data collection began at the University of Chicago, then at Midway, and currently at O'Hare which is now the official station for Chicago.

Graph of High Temperatures on Valentine's Day at Chicago

Frequency distribution of high temperatures for Chicago. This dataset shows that the most frequent range of high temperatures on Valentine’s Day is in the 30 to 39 degree range. The normal high temperature at Chicago is 35 degrees, which falls right in that range. The record high temperature on Valentine's Day is 62 degrees set in 1954. The record lowest high temperature on Valentine’s Day is 8 degrees, which occurred in 1879 and 1943. In 2017, the high temperature was 50 degrees.

Graph of Low Temperatures on Valentine's Day at Chicago

Frequency distribution of low temperatures for Chicago. This dataset shows that the most frequent range of low temperatures on Valentine’s Day is in the 20 to 29 degree range. The normal low temperature at Chicago is 20 degrees which falls in that range. The record low temperature for Chicago on Valentine's Day is 11 below set in 1905. The record highest low on Valentine’s Day is 43 in 1954. The low temperature in 2017 was 31 degrees.

Graph of Precipitation on Valentine's Day in Chicago

Frequency distribution of precipitation for Chicago. This dataset shows that the most frequent amount of precipitation recorded on Valentine’s Day is 0.00”, which accounts for 39% of the days in the dataset. The next most frequent range is a Trace followed by the 0.02” to 0.25” range. The highest amount of precipitation on Valentine’s Day occurred in 1950 when 0.94” of precipitation fell. There has never been an instance of over an inch of precipitation on Valentine’s Day. In 2017, no precipitation fell.

Graph of Snowfall on Valentine's Day in Chicago

Frequency distribution of snowfall for Chicago. This dataset shows that the most frequent amount of snowfall recorded on Valentine’s Day is 0.0”, which accounts for 50% of the days in the dataset. The next most frequent range is a Trace, followed by 0.1” to 0.9”. The highest amount of snowfall recorded on Valentine’s Day occurred in 1990 when 8.3” of snow fell. In 2017, no snow fell.

ADDITIONAL VALENTINE'S DAY CLIMATE DATA ( * MEANS LAST OCCURRENCE)

MAX TEMP WARMEST	MIN TEMP WARMEST	PCPN WETTEST	SNOW MOST
62 1954	43 1954	0.94 1950	8.3 1990
61 1918	37 2005 *	0.78 1990	3.3 1973 *
58 1887	36 1919 *	0.66 1909	2.4 1991 *
56 2006 *	35 1967 *	0.59 1883
55 1984	34 1947 *	0.54 1908
53 1915	33 2013 *	0.48 1890
51 1883 *	32 1926 *	0.41 1973
50 2017 *	31 2017 *	0.39 1887
49 2005 *	29 2012 *	0.34 1988
47 1999 *	28 2001 *	0.26 1949

MAX TEMP COLDEST	MIN TEMP COLDEST	PCPN DRIEST	SNOW LEAST
8 1943 *	-11 1905	0.00 2017 *	0.0 2017 *
10 1923	-3 1943	T 2015 *	T 2012 *
14 1905	-2 1879	0.01 2009 *	0.1 2009 *
15 1875	-1 1923 *	0.02 1978 *
18 2016	0 1946 *	0.03 2007 *
19 1985	1 2015 *	0.04 1972 *
21 2007 *	2 1884	0.05 1986 *
22 2014 *	4 1985 *	0.06 1985
23 1951 *	5 1971	0.07 1918
24 1946 *	6 1986 *	0.08 1958

ACS 2/13/2018

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Storms in the Plains; Heat Wave to Begin in the Northern Tier

Climatic Data for Chicago for Valentines Day