DECEMBER 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	40	26	33	32	0	0.09	0.2
2	40	25	32	33	0	0.10	0.2
3	39	25	32	33	0	0.09	0.2
4	39	24	31	34	0	0.09	0.2
5	38	24	31	34	0	0.09	0.3
6	38	24	31	34	0	0.08	0.2
7	37	23	30	35	0	0.09	0.2
8	37	23	30	35	0	0.09	0.3
9	37	22	29	36	0	0.08	0.2
10	36	22	29	36	0	0.08	0.3
11	36	22	29	36	0	0.09	0.2
12	35	21	28	37	0	0.07	0.3
13	35	21	28	37	0	0.08	0.3
14	35	21	28	37	0	0.07	0.2
15	35	21	28	37	0	0.07	0.3
16	34	20	27	38	0	0.07	0.3
17	34	20	27	38	0	0.06	0.3
18	34	20	27	38	0	0.06	0.3
19	34	20	26	38	0	0.07	0.3
20	33	19	26	39	0	0.06	0.3
21	33	19	26	39	0	0.07	0.3
22	33	19	26	39	0	0.06	0.3
23	33	19	26	39	0	0.06	0.3
24	33	19	26	39	0	0.06	0.3
25	32	18	25	40	0	0.06	0.2
26	32	18	25	40	0	0.06	0.3
27	32	18	25	40	0	0.06	0.4
28	32	18	25	40	0	0.06	0.3
29	32	18	25	40	0	0.06	0.3
30	32	18	25	40	0	0.06	0.4
31	32	17	24	40	0	0.06	0.3
MONTH	34.8	20.7	27.7	1155	0	2.25	8.5

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.

CHICAGO O'HARE CURRENT AND HISTORY (3-DAY) ... | NWS Chicago Office OBSERVED WEATHER REPORTS

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SUNLIGHT DATA FOR SECURITY, TRAFFIC SAFETY, AND SPORTS
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