Irish Sea

ERA5 reanalysis 2015-2024, 10 years

Roughest in Dec

46%

Week 49 · 2.3 m

Calmest in Jul

Week 29 · 0.7 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

1.4 m

Wave period

5.4 s

Mean wind

38 km/h

Air temperature

11°C

No sailing in this catalogue crosses it.