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Northern North Sea

ERA5 reanalysis 2015-2024, 10 years

Roughest in Dec

87%

Week 49 · 3.8 m

Calmest in May

6%

Week 22 · 1.4 m

Week by week

Days above 2.5 m

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Rough end of the range — At the same height a long swell is a slow roll and a short chop is a hammering. Anything under about 6 seconds is chop.

Typical wave height

2.5 m

Wave period

7.8 s

Mean wind

41 km/h

Air temperature

9°C

Sailings that cross this water