Winter darkness and improved EVP results - is there actual correlation?

I've been doing EVP recordings for about four years now and I've noticed something that might be worth discussing: my results are noticeably better during the winter months, particularly December through February. Not just more recordings, but higher quality, clearer voices, more coherent messages.

I've tried to control for other variables - same equipment, same locations, similar ambient conditions. The only major variable is the length and intensity of darkness. My hypothesis is that either: (a) spirits are more active in winter darkness, (b) my own sensitivity is somehow heightened by lower light and longer nights, or (c) electromagnetic conditions change seasonally and that somehow affects recording.

Has anyone else noticed this pattern with their own EVP work? Or am I just pattern-matching? Interested in whether this is widely reported or if I'm just finding correlations in my own limited dataset.

Could be multiple factors: atmospheric pressure changes between seasons, temperature affecting equipment performance, your own mental state being different in winter (darker, more introspective, maybe more 'open' to contact). EVP is notoriously difficult to isolate variables in because so much of it depends on the operator's expectations and state of mind.

Electromagnetic activity does vary seasonally - solar activity cycles, geomagnetic storms, all that stuff. Winter has different atmospheric conditions which could theoretically affect signal propagation. Whether that translates to better EVP, I'm less sure. But it's not crazy to think seasonal variables could play a role.

I got absolutely brilliant EVP results one summer at 2am in a cemetery. Temperature had dropped massively, humidity was high. Maybe it's not darkness itself but specific environmental conditions that happen to cluster in winter? Low temperature, high humidity, specific pressure patterns?

You should do a proper blind test - have someone analyse your winter versus summer recordings without knowing which is which and see if there's genuine quality difference. Personal assessment of your own data is notoriously unreliable.