Europe simply states, in EU-OPS: an hour before arrival until an hour after the planned arrival time, weather must be above the minima.
ICAO ANNEX 3 contains a table, included in our Ops Manual, which states that TEMPO is not applicable for planning for transient conditions (thunderstorms, showers etc) but must be considered for persistent conditions (fog, sandstorm, continuous precipitation) and also that forecast gusts may be disregarded.
In Australia, a TREND below the minima gives you the option of carrying 60 mins weather holding, or diversion fuel. ("INTER" allows 30 mins holding, or diversion fuel.)