Also, and I’m not saying this to deny climate change: variations between the coldness of a given winter and when spring onsets will, in general, greatly affect

Also, and I’m not saying this to deny climate change: variations between the coldness of a given winter and when spring onsets will, in general, greatly affect insect populations. Climate affects both how many survive the winter and how they migrate. Add oscillating patterns to that as predatory animals react delayed to that. Some years you will see huge winged ants, other years will be heavy with mosquitoes, other years will have giant hornets.