Didn't really help with the sweat problem between April and October in Texas. Or was less work than pedaling, but nothing aside from air conditioning helps with the sweat issue in Texas summer heat.
Not anymore, no. They used to be quite uncommon. Just as a reminder, we have been dumping CO2 in the atmosphere since before anyone living was ever born.
Even the generous estimates only put us at about 1°c increase by human activity. While the large scale effects of this are causing problems, it doesn't really change the fact that there are plenty of 100°F days even discounting that increase.