Vitamin D in Delaware in January: sun, UV and what to expect
Too cold Too cold here in January: afternoon highs average only 8.1°C, which is too chilly for sunbathing in light clothing. Try another month or a warmer destination.
1.7 hsun window (UV 2.5+)
2.4peak UV Index
–to a full dose
8°Cafternoon high
8/30rainy days
21/30sunny days
How long in the sun in January?
- Even at midday the UV Index stays below 2.5 for most of January, so sunbathing makes little or no vitamin D. Oily fish, fortified food or a supplement matter more. Ask your doctor.
- 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 | – | – | – |
| Type II | – | – | – |
| Type III | – | – | – |
| Type IV | – | – | – |
| Type V | – | – | – |
| Type VI | – | – | – |
Minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, at Bethany Beach, 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 January
| Place | Rating | Sun window | Full dose | Afternoon high | Rainy days |
|---|---|---|---|---|---|
| Rehoboth Beach | Too cold | 1.6 h | 21 min | 9°C | 7/30 |
| Dewey Beach | Too cold | 1.6 h | 21 min | 9°C | 7/30 |
| Bethany Beach | Too cold | 1.7 h | – | 8°C | 8/30 |
| Lewes | Too cold | 1.5 h | – | 8°C | 9/30 |
| Fenwick Island | Too cold | 1.7 h | – | 8°C | 8/30 |
Other months in Delaware
- Jan Too cold
- Feb Too cold
- Mar Too cold
- Apr Too cold
- May Too cold
- Jun Excellent
- Jul Excellent
- Aug Excellent
- Sep Good
- Oct Too cold
- Nov Too cold
- Dec Too cold
Best months: June to September. Full Delaware guide