Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

CHICAGO NORMALS (1991-2020)
JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC

May Normals for Chicago for Temperature and Precipitation

Day of Month	High	Low	Average	HDD	CDD	Precipitation
1	65.1	45.6	55.4	10.2	0.6	0.15
2	65.5	46	55.7	9.9	0.6	0.14
3	65.9	46.3	56.1	9.6	0.7	0.15
4	66.2	46.7	56.4	9.3	0.7	0.15
5	66.6	47	56.8	9	0.8	0.14
6	67	47.3	57.2	8.7	0.9	0.14
7	67.3	47.7	57.5	8.5	1	0.15
8	67.7	48	57.8	8.2	1	0.15
9	68.1	48.3	58.2	7.9	1.1	0.15
10	68.4	48.6	58.5	7.7	1.2	0.15
11	68.8	49	58.9	7.4	1.3	0.15
12	69.1	49.3	59.2	7.1	1.4	0.15
13	69.5	49.6	59.6	6.9	1.5	0.16
14	69.9	49.9	59.9	6.7	1.6	0.15
15	70.2	50.3	60.2	6.4	1.7	0.14
16	70.6	50.6	60.6	6.2	1.8	0.15
17	70.9	50.9	60.9	6	1.9	0.15
18	71.2	51.2	61.2	5.8	2	0.14
19	71.6	51.6	61.6	5.6	2.2	0.15
20	71.9	51.9	61.9	5.4	2.3	0.15
21	72.3	52.2	62.3	5.2	2.4	0.15
22	72.6	52.5	62.6	5	2.6	0.15
23	73	52.9	62.9	4.8	2.7	0.14
24	73.3	53.2	63.3	4.6	2.8	0.14
25	73.7	53.5	63.6	4.4	3	0.14
26	74	53.9	63.9	4.1	3.1	0.13
27	74.3	54.2	64.3	3.9	3.2	0.14
28	74.7	54.6	64.6	3.7	3.3	0.14
29	75	54.9	65	3.5	3.5	0.13
30	75.4	55.2	65.3	3.3	3.6	0.13
31	75.7	55.6	65.6	3.1	3.8	0.14

MONTH	70.5	50.6	60.6	198.1	60.3	4.49

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Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

May Normals for Temperature and Precipitation for Chicago