There are some additional tips, though, that I want to add about daily SPF:

1) You must reapply. Often daily moisturizers have an SPF in them, as do some makeup products. Most people think they can apply these products in the morning and be covered all day. That's simply not the case. You'll need to reapply SPF every two hours to stay covered all day, particularly if you've applied a lower SPF like 15 or 18. (I typically recommend a daily SPF of at least 30.)

2) Everyone needs daily sunscreen—no matter what your skin tone or color. So many of my darker-skinned patients tell me they don't need sunscreen because their skin is already dark. Nothing could be further from the truth. Everyone can get skin cancer and premature aging (dark hyperpigmentation spots, fine lines and wrinkles, and more) from daily exposure to the sun's rays.

3) Sun rays hit your skin on sunny—and cloudy (and rainy) days. Just because there are dark clouds and rain outside doesn't mean you can skip your daily SPF. UV rays can sneak through the clouds. This same advice holds true for snowy days, too, during the winter months.

4) You still need SPF if you're indoors, particularly if you're near windows. The sun's UV rays can penetrate glass—whether you're at home, in your office, or in your car. (Only glass that's been treated with UV protection can protect you from the sun's rays.) This is another good reason to make sure you have SPF on your face, neck, décolletage (if showing), and hands.

5) Look for an SPF with broad-spectrum protection. Most sunscreens these days offer protection against both the sun's UVA (aging and cancer-causing) and UVB (burning and cancer-causing) rays. Also apply an antioxidant serum or lotion under your sunscreen for additional protection.

So do your skin a favor and apply SPF every day of the year.

Stay safe & keep your skin healthy,

There are things you can do, however, to protect and rejuvenate your skin during fall and winter: all it takes is a few tweaks to your current routine.

1) Dial down the water temp. Sure, we all want to gravitate to steamy showers when it's cold out, but hot water will only aggravate sensitive, irritated skin even more. Use warm, not hot, water when showering—and limit your time under the spray. When washing your face and neck at night, use lukewarm water. And pat, don't rub, your skin dry. (Rubbing can make chapped skin worse.)

2) Crank up a humidifier. I call these electronics one of skin's most important beauty tools during the winter. Indoor heat sucks essential moisture out of the air; without moisture, skin gets rough, dry, and lackluster. Once you add moisture back into the air with a humidifier, skin begins to look rosy again. An added benefit: the hair and scalp gets hydrated, too, eliminating static-y fly-away strands.

3) Add an exfoliator to your daily regimen. The skin sheds its dead outermost layer every 28 days, allowing new skin cells to rise to the surface of the skin. Age and harsh weather can interfere with this process, slowing it down.

But when most people think of exfoliators, they think of harsh scrubs. This is definitely not what you should be using. (Harsh exfoliators can further irritate dry, sensitive skin.) Exfoliating best bets: natural "chemical" peeling agents like glycolic, salicylic, and azelaic acids. These help gently remove the dry, dulling outer layer of skin so fresh, radiant skin cells can shine through. (You can find these natural exfoliators in cleansers, toners, moisturizers, and chemical peels.) Exfoliate once daily; nighttime is often best as sloughing off dry, dead skin cells helps nutrient-rich night crèmes to be better absorbed so you get more noticeable results.

4) Swap out your moisturizer. Set aside the lightweight hydrator you used during the spring and summer months, or layer over it with a thicker, more hydrating cream. Your skin needs more moisture now, even if you have oily skin. Some potent hydrating ingredients to look for include hyaluronic acid, which attracts moisture to the skin, and olive oil.

5) Get some exercise. While this doesn't seem like a typical "beauty" tip, getting some exercise every day is key to boosting circulation—and radiance. Blood carries oxygen to every part of the body, including the skin. It's oxygen that gives your skin a healthy, rosy glow. So even when the weather outside is frightful, still make time for some exercise—even if it's only 5 minutes here and there throughout the day. Your body, and skin, will thank you.

Stay radiant this season!