I am constantly surprised at seeing this number around the web. More than a year ago, I posted that I had made about 80 of these tempers for a guild on my server and that the tempers were trivial to me when my brewing skill was at 228. Very different thing from a recipe that trivials at 228.
Having failed zero of the 80 or so tempers I made, I conclude that the real trivial is most likely around 130 like most other tempers in the game. As of today, www.eqtraders.com lists the trivial as <=168. Due to the difficulty in obtaining fungoid sap, folks are (quite correctly) unwilling to trust the brewing to a low skilled brewer.