In the UK, reported ATC winds are usually a 2 min average with 'instant' wind available on request. ATIS are usually updated every 30 min and the wind on this and the METAR is a 10 min average at the time of the ob and hence could be up to 20 min out of date.
Some units may not have the facility for a 2 min average report and will say 'instant wind is......'