Wrong question... Wind is relative. The question becomes "how much am I willing to suffer" and "what is my skill level on the bike" (bike handling is pretty key if the crosswinds are blowing you across the road).
Years ago in VA Beach I misjudged the weather and wound up having to ride over 10 miles directly into gale force Tropical Storm winds - 35-40 sustained with gusts over 50. I survived (hence my writing this response) but I wasn't zestfully jolly at the time. Mostly, even on "normal" extremely windy days when they post high wind warnings I still go out and ride. Unless you can plan a perfect point-to-point tailwind ride, you're going to be in a headwind 60% of the time, crosswinds 30% of the time, and blissful and effortless tailwind for 10% of the time. Guaranteed... It just happens that way.