You can and will still sunburn on overcast days (day 94)

Full cloudcover will block 70% – 90% of UV-B rays (the sunburn causing ones)

Properly applied spf 15 sunscreen will block 93% of UV-B rays for at least two hours.

Partial cloudcover can *increase* UV-B exposure by up to 40%, depending on conditions.

So overcast is substantially less protection than wearing weak sunscreen.

Hopefully useful for everyone, but especially all my fair-skinned friends who suffer from the same rationalizations i have: “oh, it’s cloudy, I’ll be fine.”

(I hate putting on sunscreen, but remembering how miserable I am when sunburned sometimes helps me overcome that, and I’m getting better at it being a thing I just do, like putting on a seatbelt.)

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s