Vaisala - Changes in company's own shares

SHARE REPURCHASE 5.6.2012

Vaisala Corporation        ANNOUNCEMENT        5.6.2012
SHARE REPURCHASE  5.6.2012                             
In the Helsinki Stock Exchange                         
Trade date                          5.6.2012           
Bourse trade               Buy                         
Share                      VAIAS                       
Amount                                   300  Shares   
Total cost                          4.410,00  EUR      
Average price/ share                 14,7000  EUR      
Highest price/ share                   14,70  EUR      
Lowest price/ share                    14,70  EUR      
Vaisala Corporation now holds a total of 154.074 shares
including the shares repurchased on 5.6.2012.          
On behalf of Vaisala Corporation                       
Nordea Bank Finland Plc                                
Petri Simberg              Julius Summanen