@JamesBon92007 I guess you already have checked this site
Getting to CBX | Cross Border Xpress . But I seems logistics would get to complicated to get to the CBX in your case
You can also fly to Los Cabos, and then either catch another short flight to Loreto, or just catch a bus or drive north. it's an incredible road trip that can anyway get done in one day. Many people do that, there are many stops in between totally worthwhile.
Baja Califrnia is definitely arid, and desert-like in many places, but there are many oasis scattered along the way, and the almost ever present mountan range is actually full of water. The canyons are pretty green all year round and many coastal towns too.
Cooler months are winter and spring months. Ambient temp is super nice then, but the water can drop to the low 60s, which is not that bad honestly. Visibility during those months can be reduced too, but in the other hand is whale and whaleshark season. From Loreto you can see the blue whales (which is on of the only places in the world where they gather), fin whales, pilot whales etc... and 2 hours drive from town, on the pacific side you can see the gray whales, which are incredibly friendly. A few hours south, you can get to La Paz and see dozens of whalesharks 5 minutes from the docks. So pretty awesome area if you ask me.
Water temp, and visibility gets suuuper nice and warm during the summer and fall months. It gets pretty hot, but the sea conditions are excelent and at its best for diving. We also receive the visit of the mobula ray schools (THOUSANDS), and it's the reproduction season for many fish, so you can expect a lot of life.
So as you can see, every season has its perks, but divewise, i like summer and fall better.