Climate data for Chicago (Midway Airport), 1991–2020 normals,[a] extremes 1928–present | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Record high °F (°C) | 67 (19) |
75 (24) |
86 (30) |
92 (33) |
102 (39) |
107 (42) |
109 (43) |
104 (40) |
102 (39) |
94 (34) |
81 (27) |
72 (22) |
109 (43) |
Mean maximum °F (°C) | 53.4 (11.9) |
57.9 (14.4) |
72.0 (22.2) |
81.5 (27.5) |
89.2 (31.8) |
93.9 (34.4) |
96.0 (35.6) |
94.2 (34.6) |
90.8 (32.7) |
82.8 (28.2) |
68.0 (20.0) |
57.5 (14.2) |
97.1 (36.2) |
Mean daily maximum °F (°C) | 32.8 (0.4) |
36.8 (2.7) |
47.9 (8.8) |
60.0 (15.6) |
71.5 (21.9) |
81.2 (27.3) |
85.2 (29.6) |
83.1 (28.4) |
76.5 (24.7) |
63.7 (17.6) |
49.6 (9.8) |
37.7 (3.2) |
60.5 (15.8) |
Daily mean °F (°C) | 26.2 (−3.2) |
29.9 (−1.2) |
39.9 (4.4) |
50.9 (10.5) |
61.9 (16.6) |
71.9 (22.2) |
76.7 (24.8) |
75.0 (23.9) |
67.8 (19.9) |
55.3 (12.9) |
42.4 (5.8) |
31.5 (−0.3) |
52.4 (11.3) |
Mean daily minimum °F (°C) | 19.5 (−6.9) |
22.9 (−5.1) |
32.0 (0.0) |
41.7 (5.4) |
52.4 (11.3) |
62.7 (17.1) |
68.1 (20.1) |
66.9 (19.4) |
59.2 (15.1) |
46.8 (8.2) |
35.2 (1.8) |
25.3 (−3.7) |
44.4 (6.9) |
Mean minimum °F (°C) | −3 (−19) |
3.4 (−15.9) |
14.1 (−9.9) |
28.2 (−2.1) |
39.1 (3.9) |
49.3 (9.6) |
58.6 (14.8) |
57.6 (14.2) |
45.0 (7.2) |
31.8 (−0.1) |
19.7 (−6.8) |
5.3 (−14.8) |
−6.5 (−21.4) |
Record low °F (°C) | −25 (−32) |
−20 (−29) |
−7 (−22) |
10 (−12) |
28 (−2) |
35 (2) |
46 (8) |
43 (6) |
29 (−2) |
20 (−7) |
−3 (−19) |
−20 (−29) |
−25 (−32) |
Average precipitation inches (mm) | 2.30 (58) |
2.12 (54) |
2.66 (68) |
4.15 (105) |
4.75 (121) |
4.53 (115) |
4.02 (102) |
4.10 (104) |
3.33 (85) |
3.86 (98) |
2.73 (69) |
2.33 (59) |
40.88 (1,038) |
Average snowfall inches (cm) | 12.5 (32) |
10.1 (26) |
5.7 (14) |
1.0 (2.5) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
1.5 (3.8) |
7.9 (20) |
38.8 (99) |
Average extreme snow depth inches (cm) | 7 (18) |
7 (18) |
4 (10) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
1 (2.5) |
4 (10) |
7 (18) |
Average precipitation days (≥ 0.01 in) | 11.5 | 9.4 | 11.1 | 12.0 | 12.4 | 11.1 | 10.0 | 9.3 | 8.4 | 10.8 | 10.2 | 10.8 | 127.0 |
Average snowy days (≥ 0.1 in) | 8.9 | 6.4 | 3.9 | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 1.6 | 6.3 | 28.2 |
Average ultraviolet index | 1 | 2 | 4 | 6 | 7 | 9 | 9 | 8 | 6 | 4 | 2 | 1 | 5 |
Source 1: NOAA[1][2][3], WRCC[4] | |||||||||||||
Source 2: Weather Atlas (UV)[5] |
Climate data for Chicago (O'Hare Int'l Airport), 1991–2020 normals,[a] extremes 1871–present[b] | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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) | 52.3 (11.3) |
56.8 (13.8) |
71.0 (21.7) |
80.9 (27.2) |
88.0 (31.1) |
93.1 (33.9) |
94.9 (34.9) |
93.2 (34.0) |
89.7 (32.1) |
81.7 (27.6) |
67.0 (19.4) |
56.4 (13.6) |
96.0 (35.6) |
Mean daily maximum °F (°C) | 31.6 (−0.2) |
35.7 (2.1) |
47.0 (8.3) |
59.0 (15.0) |
70.5 (21.4) |
80.4 (26.9) |
84.5 (29.2) |
82.5 (28.1) |
75.5 (24.2) |
62.7 (17.1) |
48.4 (9.1) |
36.6 (2.6) |
59.5 (15.3) |
Daily mean °F (°C) | 25.2 (−3.8) |
28.8 (−1.8) |
39.0 (3.9) |
49.7 (9.8) |
60.6 (15.9) |
70.6 (21.4) |
75.4 (24.1) |
73.8 (23.2) |
66.3 (19.1) |
54.0 (12.2) |
41.3 (5.2) |
30.5 (−0.8) |
51.3 (10.7) |
Mean daily minimum °F (°C) | 18.8 (−7.3) |
21.8 (−5.7) |
31.0 (−0.6) |
40.3 (4.6) |
50.6 (10.3) |
60.8 (16.0) |
66.4 (19.1) |
65.1 (18.4) |
57.1 (13.9) |
45.4 (7.4) |
34.1 (1.2) |
24.4 (−4.2) |
43.0 (6.1) |
Mean minimum °F (°C) | −4.5 (−20.3) |
0.5 (−17.5) |
11.8 (−11.2) |
25.6 (−3.6) |
36.7 (2.6) |
46.0 (7.8) |
54.5 (12.5) |
54.3 (12.4) |
41.8 (5.4) |
29.7 (−1.3) |
17.3 (−8.2) |
3.2 (−16.0) |
−8.5 (−22.5) |
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) | 1.99 (51) |
1.97 (50) |
2.45 (62) |
3.75 (95) |
4.49 (114) |
4.10 (104) |
3.71 (94) |
4.25 (108) |
3.19 (81) |
3.43 (87) |
2.42 (61) |
2.11 (54) |
37.86 (962) |
Average snowfall inches (cm) | 11.3 (29) |
10.7 (27) |
5.5 (14) |
1.3 (3.3) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.2 (0.51) |
1.8 (4.6) |
7.6 (19) |
38.4 (98) |
Average extreme snow depth inches (cm) | 6 (15) |
6 (15) |
4 (10) |
1 (2.5) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
1 (2.5) |
3 (7.6) |
6 (15) |
Average precipitation days (≥ 0.01 in) | 11.0 | 9.4 | 10.8 | 12.3 | 12.5 | 11.1 | 9.7 | 9.4 | 8.5 | 10.5 | 10.0 | 10.6 | 125.8 |
Average snowy days (≥ 0.1 in) | 8.5 | 6.4 | 4.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 1.6 | 6.1 | 27.8 |
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 |
Average dew point °F (°C) | 13.6 (−10.2) |
17.6 (−8.0) |
27.1 (−2.7) |
35.8 (2.1) |
45.7 (7.6) |
55.8 (13.2) |
61.7 (16.5) |
61.0 (16.1) |
53.8 (12.1) |
41.7 (5.4) |
31.6 (−0.2) |
20.1 (−6.6) |
38.8 (3.8) |
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, dew point and sun 1961–1990)[2][8][9] |