Vaisala Corporation ANNOUNCEMENT 8.6.2012 SHARE REPURCHASE 8.6.2012 In the Helsinki Stock Exchange Trade date 8.6.2012 Bourse trade Buy Share VAIAS Amount 900 Shares Total cost 13.500,00 EUR Average price/ share 15,0000 EUR Highest price/ share 15,00 EUR Lowest price/ share 15,00 EUR Vaisala Corporation now holds a total of 157.874 shares including the shares repurchased on 8.6.2012. On behalf of Vaisala Corporation Nordea Bank Finland Plc Petri Simberg Julius Summanen