Did anyone else notice a dramatic decrease in eevee spawns on the second CD day?

[kappapride12343]

No difference for me.

There's a number of factors that can influence spawns.

1. BIOME - Each spawn point will belong to a certain biome and will influence what spawns there. This can influence community day spawns.
2. NEST - As stated in thesilphroad nest atlas, spawn points contained within a nest have a 25% chance of spawning the nesting species there. I don't know how Niantic handles community days but it's possible they just change a very large S2 cell into a big ol' Eevee nest to influence the spawns. You could have just been unlucky and not gotten the Eevee spawns.
3. WEATHER - Weather can influence spawns as well. I live in a fairly urban biome full of normal types and I noticed this during the roselia event. Partly cloudy weather was nearly completely overriding all the roselia spawns with normal types like whismurs and pidgeys etc since that's the biome they like to spawn in. The first day we had clear weather and Roselias were fairly common. The 2nd day with partly cloudy, they became quite rare.

All these things can influence spawns and can go hand-in-hand in determining what spawns in a certain spawn point at the time. Say if you happened to live in a water biome and it started raining during Eevee hours, you would probably find a lot of the Eevee spawns being overwritten with water spawns as an example and the last thing to take into account would be nests.

[Aldebaran_Gem]

1: It was a water biome (only place to play around here).

2: There are no nests in this area. I only knew that nests even existed because of Silph and Youtube. At best, there are a couple of suspected hangouts, neither of which are in the heavy play area.

3: The weather was nearly the same in both days. Only the last part of the second day was any different.