Everywhere I've lived, humidity is a feature of climate and not weather. If you live someplace dry, it's dry. Heat is a dry heat, cold is a dry cold. So you actually can take temperature as the most significant variable.
You can see some graphs here: http://www.gids.nl/sydney/weather/ - notice how it fluctuates between about 25 and 100% humidity, particularly on the month-by-month graph.