[lutusp]

IMHO a better model would take into account both ends of the temperature spectrum. There are days in the southwest so hot that one wouldn't think of going outside -- just as though it were rainy and/or cold.

In fact, because of climate change, on days when the so-called "wet-bulb temperature" gets to 35°C (95°F), people who dare to go outside will simply die. That day may arrive sooner than people think.

Imagine this: Phoenix, AZ, a day with a wet-bulb temperature at or above 35°C. Everyone is cowering inside near their air conditioners. Then the power fails. This might also happen sooner than people expect.