Comment 8 for bug 291853

... or you could leave it confimed :) The problem occurs because some locations use timezones that are defined by libgweather as "obsolete", though the library does not attempt to match the obsolete names when searching for the time zones. For example, Montreal uses "America/Montreal", which is maked obsolete in the definition of "America/Toronto", but since libgweather does not parse the "obsoletes" tags, it can't find the time zone.

If I have some time, I will make a patch for upstream.