Now that September is here, daytime temperatures are somewhat more temperate and the mourning cloak butterfly is back in abundance.
The mourning cloak likes to avoid temperature extremes, otherwise it closes down. Over winter, it hibernates (becomes dormant to avoid the cold); over summer it aestivates (becomes dormant to avoid the heat). So, it is seen in the spring and reappears again in the fall.
This is one of many mourning cloak butterflies to be seen at this time.