SEPTEMBER CHICAGO NORMALS FOR TEMPERATURE, PRECIPITATION, SNOWFALL (1981-2010)

JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC

Day of Month	High	Low	Average	HDD	CDD	Precipitation
1	80	60	70	1	6	0.12
2	80	60	70	1	6	0.12
3	79	60	69	1	5	0.11
4	79	59	69	1	5	0.12
5	79	59	69	1	5	0.11
6	78	59	68	1	5	0.12
7	78	58	68	1	5	0.11
8	78	58	68	2	4	0.11
9	78	57	67	2	4	0.11
10	77	57	67	2	4	0.10
11	77	56	67	2	4	0.11
12	76	56	66	2	4	0.10
13	76	56	66	3	3	0.11
14	76	55	65	3	3	0.10
15	75	55	65	3	3	0.10
16	75	54	65	3	3	0.11
17	75	54	64	3	3	0.10
18	74	53	64	4	2	0.10
19	74	53	63	4	2	0.11
20	73	52	63	4	2	0.11
21	73	52	62	5	2	0.11
22	72	51	62	5	2	0.11
23	72	51	61	5	2	0.10
24	72	51	61	6	2	0.11
25	71	50	61	6	1	0.11
26	71	50	60	6	1	0.11
27	70	49	60	7	1	0.10
28	70	49	59	7	1	0.09
29	69	48	59	7	1	0.10
30	69	48	58	8	1	0.09
MONTH	74.8	54.3	64.6	105	92	3.2

HDD = A Heating Degree Day represents the number of degree(s) that the mean temperature for the day is below 65 degrees during a day.

CDD = A Cooling Degree Day represents the number of degree(s) that the mean temperature for the day is above 65 degrees during a day.

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Chicago Temperature and Precipitation Records for September

JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC

SEPTEMBER RECORD HIGHS…LOWS…AND PRECIPITATION FOR CHICAGO

Day	Record High Temp/Year	Record Low Max/Year	Record High Min/Year	Record Low Temp/Year	Record Precipitation Daily/Year
1	101/1953	62/1909	78/1912	45/1949	2.92/1977
2	101/1953	61/1974	78/1913	44/1946	1.55/2010
3	97/1953	59/1891	75/1973	47/1974	1.92/1961
4	95/1983	60/1902	74/1971	45/1997	2.95/1894
5	98/1899	62/1909	77/1912	44/1988	1.89/1971
6	97/1960	61/1885	78/1881	42/1984	1.53/1894
7	100/1960	61/1924	78/1922	42/1986	1.79/1980
8	96/1960	54/1883	76/1922	43/1986	1.65/1885
9	95/1983	56/1883	75/1912	43/1986	3.44/1875
10	95/2013	53/1917	77/2013	44/1943	2.48/1922
11	95/1952	56/2014	73/1961	42/1993	2.37/2000
12	96/1952	53/1902	72/1931	44/2014	2.43/1961
13	98/1939	55/1880	75/1927	39/1890	6.64/2008
14	99/1939	54/1923	76/1939	40/1985	2.42/1896
15	99/1939	55/1993	75/1927	39/2007	1.38/1936
16	92/1955	56/1959	72/1907	37/1984	1.16/1980
17	93/1955	51/1981	71/1906	37/1984	2.42/1927
18	94/1955	54/1901	71/1965	40/1903	1.50/1907
19	93/1955	52/1938	74/1908	40/1991	1.72/2001
20	92/2017	52/1901	73/1931	36/1991	1.33/2001
21	94/2017	50/1995	76/1931	39/1991	1.67/1947
22	94/2017	49/1974	73/1895	32/1995	1.73/2006
23	95/2017	51/1928	72/2017	29/1995	2.09/1961
24	93/2017	51/1942	71/1930	35/1989	1.85/1977
25	92/2017	46/1942	72/1920	30/1942	1.85/1961
26	92/2017	47/1942	71/1973	35/1928	2.71/1933
27	91/1971	49/1942	71/1971	31/1942	1.33/1936
28	92/1953	50/1893	71/1971	29/1942	3.65/1972
29	99/1953	44/1899	69/1904	32/1984	1.39/1921
30	92/1971	44/1899	69/1971	29/1984	1.27/1896

Trace Snowfall recorded on September 25, 1942

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