That's why I said "when you can".

Here's a small study (doesn't say time of year for some reason). Bradenton, FL compared to Erie, PA.

https://pubmed.ncbi.nlm.nih.gov/28662556/

Conclusion: Latitude was found to be a statistically significant risk factor for vitamin D deficiency. Additionally, the findings suggest that persons with darker skin tone and, to a lesser degree, men and persons who are overweight or obese are also at increased risk for vitamin D deficiency. Physicians should be cognizant of these risk factors when deciding whom to screen.

Pro tip: If you live below 35 degrees latitude you can get D every day of the year. This is because UVB rays penetrate the atmosphere at 35 degrees above the horizon.

That's why I said "when you can".

Here's a small study (doesn't say time of year for some reason)...

https://pubmed.ncbi.nlm.nih.gov/28662556/

Conclusion: Latitude was found to be a statistically significant risk factor for vitamin D deficiency. Additionally, the findings suggest that persons with darker skin tone and, to a lesser degree, men and persons who are overweight or obese are also at increased risk for vitamin D deficiency. Physicians should be cognizant of these risk factors when deciding whom to screen.