One suggestion; have you tried re-centering Southern hemisphere calendars so summer is still in the middle? The "red dot in the middle" is such a clear pattern, no reason you couldn't have it in Australia too.
(I'm one of the site creators)
While we are making suggestions, here's two more:
* pop-up with location name when hovering over a fingerprint.
* adjust colours in temperature scale to personal taste. And/or adjust temperature range in each category (my freezing cold may be another person's chilly).
EDIT: now I see the last interval is just very large: -9°C to 0°C. Something around -5°C would work better, as this is roughly where the physical properties of the world change, because road salt stops working.