We get questions regarding the whether and in general Hankø is a “windy-place” and in particular on the long-distance race you will meet rather big waves in Skagerrak.
These two whether stations are good indicators for the conditions:
https://www.yr.no/nb/historikk/graf/1-2733825/Norge/Viken/Fredrikstad/Str%C3%B8mtangen
Currents:
Currents Hankø: https://projects.met.no/~nilsmk/hanko/CLhanko.htm
Currents Oslofjord: https://fjordos.usn.no/?page_id=2470
For gribfiles with wind and currents for downloading: https://hjelp.yr.no/hc/no/articles/360009342993-V%C3%A6rdata-i-GRIB-format