A harsh winter storm has hit the world's largest butterfly sanctuary in southern Mexico, killing upwards of 1.5 million monarch butterflies, ahead of their annual migration north. The Monarch Butterfly Biosphere Reserve, a designated World Heritage Site, has a comparatively cool climate due to it's 2,700-meter (8,860-foot) elevation, typically seeing winter temperatures near the freezing mark, however this storm dropped temperatures to -12ºC (10.5ºF) and left up to a foot of snow in some areas.
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