Read a climate the way an environmental designer does. The chart plots relative-humidity curves over temperature and humidity ratio, with the comfort zone and Givoni-style passive-strategy regions — natural ventilation, thermal mass, evaporative cooling, humidification, heating — overlaid. Plot a temperature/humidity point and it tells you the humidity ratio, dew point, enthalpy, and which strategy will get you to comfort.
Runs entirely in your browser — nothing is uploaded. Export the chart with your plotted point as PNG (or SVG).