The summers in Perth are long, hot, and dry and the winters are fairly mild (but still get a little cold). They do not do central heating, so depending on where you are, it can feel cold in the mornings during the winter (but only a few months of that). The Perth mission covers a very large area, so further north can get VERY HOT, while a little cooler in the south.
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Serve shirts have a ventilation panel in the side of the shirt making them noticeably more breathable. Missionaries serving in hot or humid places absolutely RAVE about this feature. The most popular shirt for hot-climate missions, for sure.