Something that has always intrigued me, but is "unfortunate" for those living in the Southern Hemisphere is that their seasons do not match up to the liturgical calendar. Imagine Advent in June for us! Some hymns in the Office make specific reference to seasonal observances which would disagree with Southern Hemisphere seasons.
One part of me says, the Church is Universal, so don't get all worried about it. The other hints at a legitimate "localized" concession to invert the liturgical calendar in the Southern Hemisphere (i.e. Advent in June, Easter in October, etc.)