How high are your chances of skin cancer if you tan 2 or 3 times a month?

Because we have crappy weather here all the time lol, there are only a few good days a month to tan. And there are only a few months when its warm enough here so I tan about 12 times a year. If I go out 2 or 3 times a month for 30-40 minutes what are my chances of getting skin cancer?

I would recommend not tanning at all.

"The association of sunburns with the development of melanoma has led the indoor tanning industry to suggest that if only these people were tan, they would not sunburn, and thus their melanoma risk would decrease. This concept is erroneous. First, it remains unclear whether the "sunburns only" hypothesis of melanoma development is true. Second, tans acquired at indoor tanning parlors have been studied and have a very poor ability to prevent sunburning. Finally and most important, very fair-skinned people are at the highest risk for melanoma, and they tan poorly or not at all, and burn whether at the beach or at the tanning salon. For this high risk group, the burn versus tan debate is irrelevant.

While it is clear that ultraviolet light causes all three types of skin cancer, in the case of melanoma and basal cell carcinoma, it is not known whether burning or tanning is more carcinogenic. Even if burns are more carcinogenic than tanning (which clearly is not true for the development of squamous cell carcinoma), with currently available knowledge it is not reasonable to encourage tanning to prevent carcinogenic sunburns. Patrons can and frequently have burned themselves at indoor tanning parlors. Furthermore, indoor tanning provides little protection against burns from the sun. Most important, the tanning process itself, even in the absence of burning, injures the skin."

"If anyone thought the jury was still out on the danger of tanning machines, new research may provide the clincher. A study from Dartmouth Medical School in Lebanon, NH, links tanning device use to basal cell carcinoma (BCC) and squamous cell carcinoma (SCC), the most common forms of skin cancer.

The researchers interviewed 603 BCC and 293 SCC patients (plus 540 healthy subjects) about their sunbed and sunlamp use, history of sun exposure, sun sensitivity, sunburns, and other skin cancer risk factors. With all factors accounted for, tanning device users had 2.5 times the risk of SCC and 1.5 times the risk of BCC, compared to non-users." Source(s): http://www.skincancer.org/artificial/str...
http://www.skincancer.org/artificial/ind...

It doesn't only depend on how much you're "sunbathing" - it's a sum of all of your exposure to the sun, as well as other factors such as genetics.

If you're really worried about it, I would suggest investing in some self-tanner and going to see a dermatologist to see what damage has been done to your skin so far.
It also depends on your time you spent in the sun as a child. My mom developed skin cancer, and they said it was from her younger years in the sun. They traced it back to when she was a teen. Get a good self tanner, and save your skin! Believe me, you don't want to have to go through what my Mom went through, it is not worth it.
You've gotten some good answers here. I'd add that your cancer risks are dependent on age. If you are 20 realize that the tanning done now will show up as skin aging (wrinkles) at 40 and as you age is when your real skin cancer risks will show up. That's not to say you couldn't develop a melanoma now if you happen to have bad genetics.
Think of it this way; the odds are a lot higher than if you didn't tan at all. Even if you don't get cancer, when you're fifty, and you're all wrinkled and spotted, you'll wish you had stayed out of the sun.
Coming from a girl who was diagnosed with a Melanoma at the age of 20 at the small of my back, I would say STAY OUT OF THE SUN! They have wonderful lotions, creams, and sprays out these days that turn you into a golden brown, all without the harmful UV rays. As for asking your "odds" of getting skin cancer, like the previous answers said, there are many factors, including genetics and your predisposition to atypical moles, along with sun exposure that contribute to the formation of skin cancer, with Malignant Melanoma being one of them. Since I strictly burn, and don't tan, I can't be in the sun, but I do know that a lobster red burn like I get is somewhat similar at the cellular level to that deep brown that others get....it is all dealing with the melanin in your skin. At any rate, why risk the odds when dealing with skin cancer?? Use proper sun protection especially between the hours of 10am and 4pm, and use the self-tanning lotions to achieve the affect you want :)