Vitamin D in Delaware in December: sun, UV and what to expect

Too cold Too cold here in December: afternoon highs average only 8.8°C, which is too chilly for sunbathing in light clothing. Try another month or a warmer destination.

1.6 hsun window (UV 2.5+)

2.5peak UV Index

21 minto a full dose

9°Cafternoon high

4/30rainy days

25/30sunny days

Open Delaware for December on the map Find stays in Delaware

How long in the sun in December?

If you travel anyway, plan your sun session around midday (roughly 11:00 to 15:00), when the UV Index peaks at about 2.5. With about a quarter of your skin bare, a full dose takes around 21 minutes for skin type III at age 30, and about 40 minutes at age 65.
Stop well before your skin turns pink. At this UV level skin type III can start to burn after about 80 minutes of midday sun, so cover up, find shade and use SPF 30+ on skin that stays out.
Water, sand and light surfaces reflect UV, so at the beach you get a little more sun than the number suggests, for the good and the bad.

Skin type	Full dose, age 30	Full dose, age 65	Time to burn
Type I	14 min	27 min	53 min
Type II	18 min	33 min	67 min
Type III	21 min	40 min	80 min
Type IV	32 min	60 min	2.0 h
Type V	43 min	80 min	2.7 h
Type VI	71 min	2.2 h	4.4 h

Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Lewes, the median coastal place. Time to burn is the time to reach one minimal erythemal dose and does not depend on age. A rough planning guide, not medical advice.

Places in Delaware in December

Place	Rating	Sun window	Full dose	Afternoon high	Rainy days
Bethany Beach	Too cold	1.7 h	21 min	9°C	5/30
Fenwick Island	Too cold	1.7 h	21 min	9°C	5/30
Lewes	Too cold	1.6 h	21 min	9°C	4/30
Rehoboth Beach	Too cold	1.4 h	21 min	10°C	7/30
Dewey Beach	Too cold	1.4 h	21 min	10°C	7/30

Other months in Delaware

Best months: June to September. Full Delaware guide

Other sunny places in December

All best places for vitamin D in December