After suffering through Weatherpop and having Meteorologist begin locking up daily, I switched to WeatherDock to have weather in my menu bar. It seems to be more stable than either so far and has a more pleasing interface than Meteorologist. The menu icons are not ideal, though. They're designed for the full interface, either after you pull up the menu or you open the regular window. They lost a lot of detail and contrast in the menu bar.

A couple of suggestions for improvements. One is that there should be a variable refresh interval. The other programs have it. This seems to be refreshing once an hour, and that's way too seldom. Up to once every 15 minutes would be better. And right now, the days and nights in the menu blend together. It would be better to have alternating background colors for the rows, white for day and light gray for night. Just for the text, though. Leave the icon column with a white background so the icons don't need to be changed with transparency.