Thanks for the list, very useful. I'll have to dig around through the unicode pages. I think I should also expand the icon to two chars to allow things like *? (chance of snow) or ~☁ ((partly|mostly) cloudy). Or perhaps == for "Overcast"?
I was considering adding different output for different times of day: in the morning show today's forecasted high and conditions, in the evening show the forecasted low (for that night) and the conditions for the next day. It's too bad Google doesn't provide hourly forecasts.
$,=qq.\n.;print q.\/\/____\/.,q./\ \ / / \\.,q. /_/__.,q..
Happy, sober, smart: pick two.