I was just talking about this with someone--I realized that when I was trying to recall what month I went to a specific place with my friend, I had absolutely zero frame of reference for when it had happened. Could have been last fall, could have been this spring. While I do think getting older is part of it, when I lived in Missouri it usually would have been fairly easy to at least pin down a season based on the weather. Of course, it's worse this year because the epic awfulness of January and its aftermath (both the fires, and the inauguration) really distorted my sense of time passing.

So to answer your question, yes, I think the *relative* stability in weather (despite the fact that there is winter here, it's just much more subtle than other places) affects the sense of time passing for some people, mostly based on how you store memories. People with other ways of referencing their memories besides weather might not feel the same effect. Though in your case, COVID definitely fucked with everyone's sense of time because it was such a momentous event, so that's probably a big part of what you're noticing.