Time Magazine says 98F is dangerously hot for people who live in Phoenix to play sports.
How Climate Change Is Affecting the NFL | TIME
On October 4, 1933 the temperature in the San Francisco Bay Area was 98F, and it was “ideal for harvesting” but “a little too warm for personal comfort.”
Oct 05, 1933, page 1 – Hollister Advance at Newspapers.com
Oct 04, 1933, page 1 – The Sacramento Union at Newspapers.com
I played on the soccer team at ASU in 1974 and we practiced at 3PM every day, typically in temperatures around 104F. Phoenix had 18 straight days over 110F. At that time, Time Magazine was fear-mongering about a new ice age.
30 Jun 1974, Page 31 – Arizona Republic at Newspapers.com
TIME Magazine Archive Article — Another Ice Age? — Jun. 24, 1974
