While focused on large boats, the following article about lightning strikes on boats is quite informative, with statistics from insurance sources and technical details about protecting boats with Faraday cages. I'll pull three quotes.
"According to the insurance provider
BoatUS, the statistics are very unexpected. Around one in 1000 boats get hit by lightning every year. If there are about
12 million registered boats in America. Knowing that allows the numbers to become a little more clear. That’s 12,000 boats every year getting hit by lightning. One in 1,000 odds are not very high at all."
"If your boat is fifteen feet or less then you can rest a little easier. Statistically speaking, it’s not likely to be hit by lightning at all. It’s not impossible, but the numbers are not even charted, really. You have a 0 in 1,000 chance. That could mean you still have a 1 in 10,000 chance, so don’t think you’re fully immune."
"At 16 feet to 25 feet your numbers increase. There’s a 0.2 in 1,000 chance of any boat at those sizes being struck."
Of all the dangers you can face at sea, lightning is one that almost no boater considers. Lightning is not a threat in the eyes of most people. It’s considered rare and unusual. You need to get that thought out of your head as a boat owner. Lightning strikes are…
www.boatsafe.com