1981-2010 Monthly and Yearly Normals for Chicago and Rockford

Chicago Monthly and Yearly Normals (1981-2010)
	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANNUAL
HIGH	31.0	35.3.	46.6	59.0	70.0	79.7	84.1	81.9	74.8	62.3	48.2	34.8	59.1
LOW	16.5	20.1	29.2	38.8	48.3	58.1	63.9	62.9	54.3	42.8	32.4	20.7	40.8
AVERAGE	23.8	27.7	37.9	48.9	59.1	68.9	74.0	72.4	64.6	52.5	40.3	27.7	49.9
HEATING DEGREE DAYS	1279	1044	841	492	225	48	4	9	105	397	741	1155	6339
COOLING DEGREE DAYS	0	0	0	9	44	165	283	238	92	11	0	0	842
PRECIPITATION	1.73	1.79	2.50	3.38	3.68	3.45	3.70	4.90	3.21	3.15	3.15	2.25	36.89
SNOWFALL	10.8	9.1	5.6	1.2	T	0.0	0.0	0.0	0.0	0.2	1.2	8.2	36.3

Rockford Monthly and Yearly Normals (1981-2010)
	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANNUAL
HIGH	29.5	34.2	46.9	60.7	71.8	81.1	84.5	82.4	75.4	62.7	47.6	33.2	59.3
LOW	13.5	17.7	27.5	38.1	48.4	58.5	63.0	61.3	52.4	40.7	30.3	17.7	39.2
AVERAGE	21.5	25.9	37.2	49.4	60.1	69.8	73.8	71.9	63.9	51.7	38.9	25.4	49.2
HEATING DEGREE DAYS	1348	1093	862	476	198	31	3	11	117	422	782	1226	6569
COOLING DEGREE DAYS	0	0	0	8	47	175	274	223	84	9	0	0	820
PRECIPITATION	1.37	1.41	2.32	3.35	4.02	4.65	3.95	4.59	3.35	2.67	2.58	1.98	36.24
SNOWFALL	10.2	7.7	4.8	0.9	T	0.0	0.0	0.0	0.0	0.1	1.7	11.3	36.7