Hi Cathan,
usually in real world pilots use Metar and Taf in order to have situation awareness about current weather (metar) and forecast weather (taf)
I agree with you for the wind, even if should be something like 21040KT the first 3 digits usually are wind direction with increments of 10 (where the wind is coming from) and the last 2 the velocity.
OVC is overcast at 4000 feet (you are again right)
SCT is scattered at 23000 feet
66F degree..... usually in metar/taf are in celsius
Altimeter is 2983
SST:52 F I can guess but I ve never seen that before..... SUNSET Temperature? I dunno
SEAS:5 ... I really dunno I hope someone can help.