Vitamin D in New York City

New York City is the calculator’s former default and provides a mid-latitude comparison for northern US cities. Location affects possible vitamin D production from sunlight; it does not change the age-based dietary reference intake or determine whether a particular person needs a supplement.

See New York City's sunlight estimate in the calculator

What the monthly model shows

The chart uses latitude 40.7128°, longitude -74.0060°, and elevation 10 m. It is model version 2026.09 with reference year 2026. It is not a weather forecast or measured local UV record.

Modeled daily IU from 30 minutes between 10:00 and 14:00 local solar time, skin type II, long sleeves and pants (15% exposed), 40% cloud cover, grass surface, and SPF 0. Customize every input.
Monthly modeled vitamin D production and gap to adult RDA in New York City
MonthModeled sunlightGap to RDA*
January45 IU/day355 IU/day
February192 IU/day208 IU/day
March594 IU/day0 IU/day
April1,390 IU/day0 IU/day
May2,245 IU/day0 IU/day
June3,080 IU/day0 IU/day
July3,346 IU/day0 IU/day
August2,798 IU/day0 IU/day
September1,684 IU/day0 IU/day
October582 IU/day0 IU/day
November115 IU/day285 IU/day
December32 IU/day368 IU/day

*Mathematical gap after modeled sunlight and an assumed 200 IU/day from food. This is not a supplement recommendation.

How much vitamin D do adults need?

US dietary reference amounts are 600 IU (15 µg) daily from all sources for adults through age 70 and 800 IU (20 µg) after age 70. Individual treatment needs cannot be inferred from latitude.

Read the current NIH Office of Dietary Supplements guidance

Vitamin D and seasonal depression

Seasonal affective disorder is a form of depression related to seasonal changes in daylight. Low vitamin D can coexist with it, but research on vitamin D as a SAD treatment is mixed. Established options include clinician-guided light therapy, psychotherapy, and medication. Read the evidence guide to vitamin D and SAD.

Advertisement