JANUARY 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	Snowfall
1	32	17	24	41	0	0.06	0.3
2	31	17	24	41	0	0.07	0.3
3	31	17	24	41	0	0.06	0.4
4	31	17	24	41	0	0.06	0.3
5	31	17	24	41	0	0.06	0.3
6	31	17	24	41	0	0.07	0.3
7	31	17	24	41	0	0.06	0.4
8	31	17	24	41	0	0.06	0.3
9	31	17	24	41	0	0.06	0.4
10	31	17	24	41	0	0.06	0.3
11	31	16	24	41	0	0.06	0.3
12	31	16	24	41	0	0.06	0.4
13	31	16	24	41	0	0.05	0.3
14	31	16	24	41	0	0.06	0.4
15	31	16	24	42	0	0.06	0.3
16	31	16	24	42	0	0.05	0.3
17	31	16	23	42	0	0.06	0.4
18	31	16	23	42	0	0.05	0.4
19	31	16	23	42	0	0.05	0.4
20	31	16	23	42	0	0.06	0.3
21	31	16	24	42	0	0.05	0.4
22	31	16	24	42	0	0.05	0.4
23	31	16	24	41	0	0.05	0.3
24	31	16	24	41	0	0.06	0.4
25	31	16	24	41	0	0.04	0.3
26	31	16	24	41	0	0.05	0.4
27	31	16	24	41	0	0.05	0.3
28	31	17	24	41	0	0.05	0.4
29	31	17	24	41	0	0.05	0.3
30	32	17	24	41	0	0.05	0.4
31	32	17	24	41	0	0.05	0.4
MONTH	31.0	16.5	23.8	1279	0	1.73	10.8

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.

SOURCE: www.weather.gov/lot/January_Normals_Chicago

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