IIRC I believe I had it refreshing only every 2-3 hours or so. Even then I was shocked to see how much of my battery it was using.
[UPDATE] I've now played with all the weather apps/widgets referred to in this thread and I'm now ready to proclaim a winner......(drum roll please).....And the winner is.....
1 Weather
It's the most clear, simply laid out with great 10 day predictions and a nice little "discussion" of current weather conditions when you open it up.
Too bad I can't put my transparency to 100%. I'm using Nova launcher.
I have accuweather on mine and also the NBC4NY weather app also. I get alerts all the time for severe weather from accuweather.
You can turn them off in the app settings.
Sent From Inside The TARDIS With My Galaxy S5