Hi John, Another factor that doesn't fit the zones neatly into zip codes is altitude. In my case I am 2.5 miles/4km straight line horizontally from the official weather station, and 750'/230m higher in altitude. My rainfall is 50% more than the official measure, and I average almost 10F cooler. Here in the tropics, altitude has a much greater effect on temperature among other things than on the U.S. mainland. And we are both in the same zip code. Gary in Hilo, HI, where it rains every day, and in the winter it rains all day Zone 13/14 if there were such zones, 200"/500cm rain evenly spread throughout the year