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When are there jellyfish in Denmark?

Lion's mane are recorded most in January, February, July, August, September and December .

Lion's mane (painful sting)

Recorded well above the expected rate in January, February, July, August, September and December, peaking at 5.3× the expected rate. Based on 564 records.

MonthJanFebMarAprMayJunJulAugSepOctNovDec
Recorded vs expected 5.1 1.7 0.2 0.1 0.3 0.8 5.2 5.3 2.3 0.8 0.7 2.2

True jellyfish (varies by species)

Above the expected rate in January, June, July, August and September — but those months sit in different parts of the year rather than forming one season, so the monthly figures below are worth more than any summary of them would be. Based on 2,101 records.

MonthJanFebMarAprMayJunJulAugSepOctNovDec
Recorded vs expected 1.4 0.7 0.1 0.1 0.4 1.7 7.8 4.4 2.1 0.7 0.3 0.7

Sea temperature in Denmark

Records from GBIF, the Global Biodiversity Information Facility. How the adjustment works