Why cities suffocate, especially at night, during heat waves

The 1^is July, the Metropolis of Lyon was sufficient under more than 36 ° C in the shade. Therefore, It was not until 5:30 a.m. Similarly, the next morning for the temperature to fall below 25 ° C … Therefore, but only in the peripheral municipalities. However, In the center of Lyon. Similarly, the temperature remained greater than 27 ° C all night, enough to complicate the chances of a restful sleep for its inhabitants.

Lyon Marseille

In Lyon, up to 4 ° C difference between the center and why cities suffocate, especially night, the periphery

Temperatures noted on 1^is July.

Graphic using data, use accessibility options to see gross data or strengthen contrasts.

The 294 Netatmo weather sensors installed by individuals in the Metropolis of Lyon were grouped according to their establishment. Here we display the middle temperature every hour, of the 1^is July 2025 at 6:30 a.m. the next day at 5:30 a.m.

In Marseille, up to 2 ° C difference between the center and the periphery

Temperatures noted on 1^is July.

Graphic using data, use accessibility options to see gross data or strengthen contrasts.

The 490 Netatmo weather sensors why cities suffocate, especially night, installed by individuals in the metropolis of Aix-Marseille were grouped according to their establishment. Here we display the middle temperature every hour, of the 1^is July 2025 at 6:30 a.m. the next day at 5:30 a.m.

Source: Netatmo, calculations The world

Same phenomenon in Marseille. While the day was cooler in the Marseille city than in the other municipalities of the metropolis. because of the sea breeze which refreshes the city during the day, the thermometer struggled to descend in the evening. During the coldest hours. the temperature of the city center was still two degrees higher than that of the other municipalities of the metropolis.

You have 89.79% of this why cities suffocate, especially night, article to read. The rest is reserved for subscribers.