Scott,
Thanks for help.
This line around 503 in ajaxWDwx.js made the change I was looking for. I changed snow to 1, which I believe is level of accuray in US.
var imperialDP = // decimal places
{ Temp:1 ,Wind:1 ,Baro:2 ,Rain:2 ,Snow:1 ,Alti:0 ,Dist:2 ,UV:0 };