Vintage, I'm interested in the 10 minute average that you use for the Metar, I gather your equipment does this for you, am I correct?
My equipment is second-to-none, but, yes, the Vaisala wind instruments we have does this for us.
The use of the 10 min and 2 min average is an ICAO SARP and contained in Annex 3, para 4.5.5.
VA