Living Under the Florida Sun
St. Petersburg, Florida averages 361 days of sunshine per year, earning its nickname as the Sunshine City. While the warm climate and abundant sunlight are among the top reasons people love living here, that same sun exposure carries real health risks that many residents underestimate.
Skin cancer is the most common cancer in the United States, and Florida consistently ranks among the top states for melanoma incidence. At Zimmer Medical Group, we see the effects of sun damage regularly, and we want our patients to enjoy Florida's outdoor lifestyle while protecting their skin.
Understanding UV Radiation
Ultraviolet radiation from the sun comes in two forms that reach your skin:
- UVA rays penetrate deep into the skin, causing premature aging, wrinkles, and contributing to skin cancer. UVA rays are present at relatively constant intensity throughout the day and can pass through clouds and glass.
- UVB rays are the primary cause of sunburns and play a major role in developing skin cancer. UVB intensity peaks between 10 AM and 4 PM.
In St. Petersburg, the UV index frequently reaches 8 to 11 (very high to extreme) during summer months, but even in December and January, it regularly exceeds 3, the level at which sun protection is recommended by the World Health Organization.
Choosing the Right Sunscreen
Not all sunscreens are created equal. Here is what to look for:
SPF Rating
SPF (Sun Protection Factor) measures protection against UVB rays. The Skin Cancer Foundation recommends SPF 30 as the minimum for daily use, which blocks approximately 97 percent of UVB rays. SPF 50 blocks about 98 percent. No sunscreen blocks 100 percent of UV rays.
Broad Spectrum
Choose sunscreens labeled "broad spectrum," which protect against both UVA and UVB rays. Active ingredients that provide broad-spectrum protection include zinc oxide, titanium dioxide, avobenzone, and ecamsule.
Water Resistance
For outdoor activities in Florida's heat, where sweating is inevitable, choose water-resistant formulas rated for 40 or 80 minutes. Reapply after swimming, sweating heavily, or toweling off, regardless of the water-resistance rating.
Mineral vs. Chemical Sunscreens
- Mineral (physical) sunscreens contain zinc oxide or titanium dioxide. They sit on the skin's surface and reflect UV rays. They are less likely to cause skin irritation and begin working immediately upon application.
- Chemical sunscreens contain organic compounds that absorb UV rays and convert them to heat. They tend to be lighter and more cosmetically elegant but require 15 to 20 minutes to become effective after application.
Both types are effective when used properly. The best sunscreen is one you will actually use consistently.
How to Apply Sunscreen Correctly
Most people apply far too little sunscreen, reducing its effectiveness by 50 percent or more. Proper application involves:
- Use enough. An adult needs approximately one ounce (a shot glass full) to cover the entire body. For the face alone, use about a nickel-sized amount.
- Apply 15 to 20 minutes before sun exposure to allow chemical sunscreens to bind to the skin.
- Reapply every two hours or more often if swimming or sweating.
- Do not forget commonly missed areas: ears, back of the neck, tops of the feet, the part line in your hair, and the backs of your hands.
- Use lip balm with SPF 30 or higher. Lip skin is thin and particularly vulnerable to UV damage.
Beyond Sunscreen: Comprehensive Sun Protection
Sunscreen is important but should be part of a broader sun safety strategy:
Seek Shade During Peak Hours
UV radiation is strongest between 10 AM and 4 PM. When possible, plan outdoor activities for early morning or late afternoon. When you must be outside during peak hours, seek shade under trees, umbrellas, or covered structures.
Wear Protective Clothing
- Wide-brimmed hats (at least 3 inches) protect the face, ears, and neck far more effectively than baseball caps.
- UPF-rated clothing is specifically designed to block UV rays. A standard cotton T-shirt provides a UPF of only about 5, while UPF clothing provides 30 to 50 or more.
- UV-blocking sunglasses protect your eyes and the delicate skin around them. Look for sunglasses that block 99 to 100 percent of UVA and UVB rays.
Be Extra Cautious Near Water and Sand
Water and sand reflect UV rays, increasing your exposure by 10 to 25 percent even when you are under a beach umbrella. This reflected radiation is a major reason why people burn at the beach despite sitting in the shade.
Check the UV Index Daily
Most weather apps and websites include the daily UV index. In Florida, checking this number should be as routine as checking the temperature before heading outside.
Recognizing Sun Damage
Regular skin self-examinations are essential for early detection of skin cancer. Use the ABCDE rule for evaluating moles:
- A - Asymmetry: One half does not match the other.
- B - Border: Edges are irregular, ragged, or blurred.
- C - Color: The color is not uniform. It may include shades of brown, black, pink, red, or white.
- D - Diameter: Larger than 6 millimeters (about the size of a pencil eraser), though melanomas can be smaller.
- E - Evolving: The mole is changing in size, shape, or color.
Any mole or skin lesion that meets one or more of these criteria should be evaluated by your healthcare provider promptly.
When to Get a Professional Skin Check
We recommend annual professional skin examinations for all Florida residents, and more frequent checks for those with:
- A personal or family history of skin cancer
- Fair skin that burns easily
- A large number of moles (more than 50)
- A history of blistering sunburns, especially in childhood
- A history of tanning bed use
Early detection is key. When melanoma is caught before it spreads beyond the skin, the five-year survival rate exceeds 99 percent.
Due for a skin check or have a concerning spot? Contact Zimmer Medical Group to schedule an appointment. Living in Florida means enjoying the sunshine responsibly, and we are here to help you protect your skin.
