I remember talk about a similar ladybug swarm back when I was a kid. It was a dry summer and it was assumed they were looking for areas with more water. Other

I remember talk about a similar ladybug swarm back when I was a kid. It was a dry summer and it was assumed they were looking for areas with more water. Other than that, insects are often quite small and their altitude varies with the weather. Low-flying swallows are seen as a sign of coming rain here in Finland, as the insects are closer to the ground when the atmospheric pressure is low.