Climate of Chicago
Data

Climate of Chicago

Section Title: Data
Table Section Text: None

Climate data for Chicago (O'Hare Int'l Airport), 1981–2010 normals, extremes 1871 – present

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year

Record high °F (°C)	67 (19)	75 (24)	88 (31)	91 (33)	98 (37)	104 (40)	105 (41)	102 (39)	101 (38)	94 (34)	81 (27)	71 (22)	105 (41)

Mean maximum °F (°C)	51.4 (10.8)	56.5 (13.6)	72.4 (22.4)	81.7 (27.6)	87.2 (30.7)	93.6 (34.2)	95.5 (35.3)	93.4 (34.1)	89.7 (32.1)	81.1 (27.3)	67.6 (19.8)	55.0 (12.8)	96.8 (36.0)

Average high °F (°C)	31.0 (−0.6)	35.3 (1.8)	46.6 (8.1)	59.0 (15.0)	70.0 (21.1)	79.7 (26.5)	84.1 (28.9)	81.9 (27.7)	74.8 (23.8)	62.3 (16.8)	48.2 (9.0)	34.8 (1.6)	59.1 (15.1)

Daily mean °F (°C)	23.8 (−4.6)	27.7 (−2.4)	37.9 (3.3)	48.9 (9.4)	59.1 (15.1)	68.9 (20.5)	74.0 (23.3)	72.4 (22.4)	64.6 (18.1)	52.5 (11.4)	40.3 (4.6)	27.7 (−2.4)	49.9 (9.9)

Average low °F (°C)	16.5 (−8.6)	20.1 (−6.6)	29.2 (−1.6)	38.8 (3.8)	48.3 (9.1)	58.1 (14.5)	63.9 (17.7)	62.9 (17.2)	54.3 (12.4)	42.8 (6.0)	32.4 (0.2)	20.7 (−6.3)	40.8 (4.9)

Mean minimum °F (°C)	−5.6 (−20.9)	−0.3 (−17.9)	11.9 (−11.2)	23.5 (−4.7)	35.6 (2.0)	44.3 (6.8)	52.0 (11.1)	52.6 (11.4)	39.2 (4.0)	28.4 (−2.0)	16.9 (−8.4)	−0.1 (−17.8)	−10.9 (−23.8)

Record low °F (°C)	−27 (−33)	−21 (−29)	−12 (−24)	7 (−14)	27 (−3)	35 (2)	45 (7)	42 (6)	29 (−2)	14 (−10)	−2 (−19)	−25 (−32)	−27 (−33)

Average precipitation inches (mm)	1.73 (44)	1.79 (45)	2.50 (64)	3.38 (86)	3.68 (93)	3.45 (88)	3.70 (94)	4.90 (124)	3.21 (82)	3.15 (80)	3.15 (80)	2.25 (57)	36.89 (937)

Average snowfall inches (cm)	10.8 (27)	9.1 (23)	5.6 (14)	1.2 (3.0)	trace	0 (0)	0 (0)	0 (0)	0 (0)	0.2 (0.51)	1.2 (3.0)	8.2 (21)	36.3 (92)

Average precipitation days (≥ 0.01 in)	10.5	8.8	11.1	12.0	11.6	10.2	9.8	9.8	8.3	10.2	10.8	11.0	124.1

Average snowy days (≥ 0.1 in)	8.2	5.9	4.2	0.9	0	0	0	0	0	0.2	1.7	6.9	28.0

Average relative humidity (%)	72.2	71.6	69.7	64.9	64.1	65.6	68.5	70.7	71.1	68.6	72.5	75.5	69.6

Mean monthly sunshine hours	135.8	136.2	187.0	215.3	281.9	311.4	318.4	283.0	226.6	193.2	113.3	106.3	2,508.4

Percent possible sunshine	46	46	51	54	62	68	69	66	60	56	38	37	56

Source: NOAA (relative humidity and sun 1961–1990)

Sentence(s)

The average high temperature in January is 31.0 °F (−0.6 °C) and the average low is 16.5 °F (−8.6 °C).

final_sentence: The average high temperature in January is 31.0 °F (−0.6 °C) and the average low is 16.5 °F (−8.6 °C).