Weather archive in Chicago / O'Hare (airport)
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| Date / Local time | T | Po | P | Pa | U | DD | Ff | ff10 | ff3 | N | WW | W1 | W2 | Tn | Tx | Cl | Nh | H | Cm | Ch | VV | Td | RRR | tR | E | Tg | E' | sss | |
| 2026 July 21, Tuesday | 22 | 21.1 70 | 741.8 29.2 988.99 988.99 | 759.4 29.9 1012.45 1012.45 | 3.2 0.13 4.27 4.27 | 73 | Wind blowing from the north-northeast | Fresh breeze (9 m/s) (32 km/h) (20 miles/hour) (17 knots) (5 Bft) | 11 m/s 40 km/h 25 miles/hour 21 mile/hour 6 Bft | 70 – 80%. 7/10 – 8/10. 6 oktas | 600-1000 1968-3281 | 16.0 9.9 | 16.1 61 | ||||||||||||||||
19 | 27.2 81 | 738.6 29.08 984.72 984.72 | 756.1 29.77 1008.05 1008.05 | 1.0 0.04 1.33 1.33 | 45 | Wind blowing from the north-west | Fresh breeze (8 m/s) (29 km/h) (18 miles/hour) (16 knots) (5 Bft) | 12 m/s 43 km/h 27 miles/hour 23 knots 6 Bft | 20–30%. 2/10–3/10. 2 oktas | 23.3 74 | 30.6 87 | 1500-2000 4921-6562 | 16.0 9.9 | 14.4 58 | |||||||||||||||
16 | 30.0 86 | 737.6 29.04 983.39 983.39 | 754.9 29.72 1006.45 1006.45 | 0.5 0.02 0.67 0.67 | 40 | Wind blowing from the west-northwest | Moderate breeze (7 m/s) (25 km/h) (16 miles/hour) (14 knots) (4 Bft) | 11 m/s 40 km/h 25 miles/hour 21 mile/hour 6 Bft | 50%. 5/10. 4 oktas | 1500-2000 4921-6562 | 16.0 9.9 | 15.0 59 | |||||||||||||||||
13 | 28.9 84 | 737.1 29.02 982.72 982.72 | 754.5 29.7 1005.92 1005.92 | 0.8 0.03 1.07 1.07 | 48 | Wind blowing from the north-west | Fresh breeze (8 m/s) (29 km/h) (18 miles/hour) (16 knots) (5 Bft) | 12 m/s 43 km/h 27 miles/hour 23 knots 6 Bft | 50%. 5/10. 4 oktas | 23.3 74 | 29.4 85 | 1000-1500 3281-4921 | 16.0 9.9 | 16.7 62 | |||||||||||||||
10 | 27.2 81 | 736.3 28.99 981.65 981.65 | 753.6 29.67 1004.72 1004.72 | 0.2 0.01 0.27 0.27 | 62 | Wind blowing from the west-northwest | Gentle breeze (5 m/s) (18 km/h) (11 miles/hour) (10 knots) (3 Bft) | 20–30%. 2/10–3/10. 2 oktas | 600-1000 1968-3281 | 16.0 9.9 | 19.4 67 | ||||||||||||||||||
07 | 23.3 74 | 736.1 28.98 981.39 981.39 | 753.4 29.66 1004.45 1004.45 | 0.5 0.02 0.67 0.67 | 85 | Wind blowing from the west-southwest | Light breeze (3 m/s) (11 km/h) (7 miles/hour) (6 knots) (2 Bft) | 70 – 80%. 7/10 – 8/10. 6 oktas | 23.3 74 | 27.8 82 | 2500 or more, or no clouds. 8202 or more, or no clouds. | 16.0 9.9 | 20.6 69 | Trace of precipitation Trace of precipitation | 6 | ||||||||||||||
04 | 24.4 76 | 735.6 28.96 980.72 980.72 | 752.9 29.64 1003.78 1003.78 | -0.3 -0.01 -0.4 -0.4 | 82 | Wind blowing from the west-southwest | Gentle breeze (4 m/s) (14 km/h) (9 miles/hour) (8 knots) (3 Bft) | 8 m/s 29 km/h 18 miles/hour 16 knots 5 Bft | 100%. 10/10. 8 oktas | Thunderstorm, slight or moderate, without hail, but with rain and/or snow at time of observation. | 1000-1500 3281-4921 | 16.0 9.9 | 21.1 70 | Trace of precipitation Trace of precipitation | 3 | ||||||||||||||
01 | 24.4 76 | 735.9 28.97 981.12 981.12 | 753.1 29.65 1004.05 1004.05 | -0.4 -0.02 -0.53 -0.53 | 85 | Wind blowing from the west | Gentle breeze (4 m/s) (14 km/h) (9 miles/hour) (8 knots) (3 Bft) | 70 – 80%. 7/10 – 8/10. 6 oktas | 26.1 79 | 1500-2000 4921-6562 | 11.0 6.8 | 21.7 71 | |||||||||||||||||
| July 20, Monday | 22 | 24.4 76 | 736.3 28.99 981.65 981.65 | 753.8 29.68 1004.98 1004.98 | -2.1 -0.08 -2.8 -2.8 | 79 | Wind blowing from the south-west | Gentle breeze (5 m/s) (18 km/h) (11 miles/hour) (10 knots) (3 Bft) | 70 – 80%. 7/10 – 8/10. 6 oktas | Haze. | 2500 or more, or no clouds. 8202 or more, or no clouds. | 9.0 5.6 | 20.6 69 | ||||||||||||||||