why are there so many monarch butterflies around these days?

Question

I'm in New England.

Answer 1

Monarchs are especially noted for their lengthy annual migration. They make massive southward migrations from August through October. A northward migration takes place in the spring. Female Monarchs deposit eggs for the next generation during these migrations. The population east of the Rocky Mountains overwinters in the sanctuary in Angangueo, Michoacán, Mexico, and the western population overwinters in various sites in central coastal California, United States, notably in Pacific Grove and Santa Cruz. The length of these journeys far exceeds the lifetime of most Monarchs, which is less than two months for butterflies born in early summer. The last generation of the summer lives up to 7 months, during which it flies to the overwinter location. This generation does not reproduce until it leaves the overwinter location the following spring, but it is actually this generation's children and great-grandchildren that return to their northern location in the spring. How the species manages to return to the same overwintering spots over a gap of several generations is still a subject of research; the flight patterns are inherited, based on a combination of circadian rhythm and the position of the sun on the sky.[1]

Answer 2

Environmental factors were favorable and so they had an extremal successful mating season.

Answer 3

They are beginning their migration south to Mexico.

Answer 4

There are so much because they mate alot