One needs to account for relative humidity, which the ocean provides. Much of the US landmass between the pacific crestline and the rocky mountains is arid dese

One needs to account for relative humidity, which the ocean provides. Much of the US landmass between the pacific crestline and the rocky mountains is arid desert (from the canadian border to mexico). Second, there exist ocean-specific dynamics like el-nino, which don't really have an overland anolog.