Final figures: a very humid summer

Wednesday 3 September 2025 16:21 CDT   David Braverman
ChicagoClimate changeSummerWeather

A few weeks ago I gathered up the dewpoint statistics for Inner Drive Technology WHQ to show that, yes, this summer really sucked. I promised the final numbers after summer officially ended Sunday night, and here they are:

Jun 1 to Aug 31 (UTC)

2024

2025

Avg temperature

22.6°C

23.1°C

Avg dewpoint

17.9°C

18.7°C

(June)

16.8°C

16.8°C

(July)

18.9°C

20.8°C

(August)

18.4°C

18.4°C

Total days dewpoint ≥ 20°C

27

42

Total readings dewpoint ≥ 20°C

3,791
(33.5%)

5,856
(45.0%)

Total readings

11,317

13,009

The average dewpoint for the summer and for August both dropped a lot in the last 10 days of the month. August 24th to 31st had an average dewpoint of just 12.8°C, while for the first two thirds of the month we had a tropical 20.5°C. Those 8 autumn-like days ending the summer made a huge difference.

As if to underscore that we're now officially in autumn, a cold front is pushing through the area. It's still 22°C at IDTWHQ; the overnight forecast has the temperature steadily dropping to 11°C by sunrise. If that happens, it'll be the coolest weather we've had since May 31st (9°C).

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