Explore the history of Les Portes-en-Ré
Analyze jellyfish observation trends from 2021 to today. This calendar shows the encounter probability based on presence and absence reports.
Select a city to display the historical calendar.
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City vigilance index
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Analysis Period
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365-day rolling average
Peak Probability
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Seasonal frequency
Annual probability calendar
Historical probability of presence by day
How to read this data?
A 50 % probability does not mean the beach is "infested". It indicates that over several years, on this date, one out of two reports mentioned jellyfish presence.
Found inaccuracies?
The more absence data we have, the more accurate this calendar becomes for swimmers and fair for municipalities.
Environmental Analysis
Statistical comparison of ocean and weather conditions between jellyfish days and clear days. Method: Welch's t-test with FDR correction (Benjamini-Hochberg). Variables sorted by statistical significance.
Learn more about the methodology