The annual spate of releases in September has influenced this month’s gainers in online search frequency. For the third consecutive month, Dom Pérignon Vintage Brut has seen the largest increase in average monthly searches, which we calculate using three-month data from Wine-Searcher measured against the previous period. Dom Pérignon 2009 was released in early September, and the wine’s increase of 5,154 searches is the largest incremental monthly increase seen this year, taking it to 60,241 average searches per month: the highest of any Champagne and fifth highest of all wines.

Following last month’s narrowing of regions within the top five (only two were featured), the breadth in September significantly increased, with icons from California, Bordeaux, Piedmont, and Chile joining Champagne. The number of searches has also increased dramatically after the summer slowdown, with 19 wines seeing an increase of over 1,000 average monthly searches. The release of Opus One 2014 at the beginning of September – judged “a gorgeous wine” by our partner critic Antonio Galloni – has boosted interest in this Napa Valley stalwart, with an increase of 4,651 searches taking it to over 40,000 searches per month.

Château d’Yquem is another wine to see online search frequency rise on the back of a September release. The 2015 was released alongside Opus One 2014 at €250 ex-négociant.

The next in the table, Bartolo Mascarello Barolo, has the lowest search frequency of any of the wines above, with an average 10,075 per month. Nevertheless, with an overall Wine Lister score of 941/1,000 the wine is one of the great names of Barolo: the fourth best overall on Wine Lister.

Almaviva celebrated its twentieth anniversary in June, while its producer Viña Concha y Toro has recently entered the global ranking inside the Top 10 Beverages category within the Dow Jones Sustainability Index for the first time. With the release of Almaviva 2015 in early September adding to the interest, the wine has seen an increase of 2,858 online monthly searches, taking it to 11,291.