Kids went to open-air schools during this epidemic. In winter. In New England.

...In 1913, Providence finally opened a second open-air school. That number reached 11 in 1926, and these special facilities would serve the city for another 31 years. By that time, the concept of an open-air classroom had spread to more than 150 American cities, aiding both the minds and bodies of thousands of students...

https://www.washingtonpost.com/history/2020/09/14/open-air-schools-outdoor-coronavirus/?fbclid=IwAR17337gR5-uVkfeL09d8ImsAlqE1JmT9x3HzLuh5NOXeoedBSQMYO_gfgk