Eons ago, I developed software to display a psychrometric chart and perform simple calculations like dry bulb and wet bulb temperature.

I now revived this code with the help of our AI assistants. It might prove useful.

To see the values change, grab the small yellow marker with the mouse or adjust the values manually in the box above the horizontal line.

The shaded areas represent the "human comfort zone" in winter (blue) and summer (red). As set up, the chart includes temperature and humidity values recently reported, e.g., in India (43 C, 25% relative humidity) but values that are deadly to humans (wet bulb temperature above ~33 C) still fall far outside the depicted region, off to the top right.