Multi-Year Seasonal Curve
2022 – 2026 overlay
20222023202420252026
Outbreak Heatmap
Weeks ≥ 4.5% ILI (outbreak threshold)
2022
2023
2024
2025
2026
W1W26W52
Temperature vs ILI
Inverse correlation across all seasons
Precipitation vs ILI
Environmental Correlation Summary
- • Lower temperatures align with higher ILI activity (r ≈ −0.62).
- • Precipitation shows weak correlation with ILI spread (r ≈ +0.14).
- • Seasonal patterns dominate variance — sin/cos week encoding captures ~71% of signal.