YSK: Dew Point is a much better measurement for how humid it "feels" outside than relative humidity. Dew Point < 55 pleasant, 55 -60 is noticeable. 65+ is unpleasant.
from /r/YouShouldKnow
YSK: 露点は、相対湿度よりも、外気の湿度を「感じる」のに適した測定方法です。露点＜55は快適、55～60は目立ちます。65以上は不愉快です。