When I was in high school, I worked at my dad's greenhouse. We had 4 glass greenhouses, each 100 ft long and contained about 5000 windows each. Each summer for 4 years, we took out all the glass from one house. I scraped and cleaned windows. We had a cutter that would clean the channel on each side of the bar of old putty, then we had to wire brush the bars and paint them. Then we replaced the windows and for permanence, we added an aluminum bar cap that sealed the window and kept the wood from being exposed to the elements.
It was usually in the high 80s to 90s and with the typical high humidity for the Ohio Valley. We would start early, around 6:30, and knock off around 2pm. Otherwise things in the sun were pretty much unbearable. It would take about 2 months to complete the job and that would be during July and August. Sometimes you would get the pop up thunderstorm that would cool things down for 20 minutes and the make the humidity go up even more.
We also replaced the tar roof over the office area in the back one summer. I can't say it was enjoyable, but it had to be done.
I don't ever remember the weather service issuing warnings about excessive heat. They tried to tell you what to expect and you prepared to work around it.
Last Thursday, I walked 18 holes, starting at 3:30. The TV seemed to mention heat warnings at every chance. Dew point was in the 70s, and the temp got up to 94. I wasn't really sure I would make it by about the 14th hole, but I persevered. We finished about 8:00. I'll do it again tomorrow if it isn't raining.