No-fibs — what this lab is
This is n=1 self-tracking: you log the weather you personally experienced and your own self-rated mood — the app never fetches weather data, so your logs are the only data. A Pearson r over a handful of days is suggestion, not science — weather-mood links in real research are small and vary by person (hence the appeal of self-tracking). Correlation ≠ causation: cloudy weeks also correlate with Mondays. Log at least ~2 weeks before believing your own number.