Vaisala - Changes in company's own shares

SHARE REPURCHASE 14.5.2012

Vaisala Corporation       ANNOUNCEMENT      14.5.2012
SHARE REPURCHASE  14.5.2012                          
In the Helsinki Stock Exchange                       
Trade date                       14.5.2012           
Bourse trade              Buy                        
Share                     VAIAS                      
Amount                                 600  Shares   
Total cost                        9.580,96  EUR      
Average price/ share               15,9683  EUR      
Highest price/ share                 16,00  EUR      
Lowest price/ share                  15,91  EUR      
Vaisala Corporation now holds a total of 9.750 shares
including the shares repurchased on 14.5.2012.       
On behalf of Vaisala Corporation                     
Nordea Bank Finland Plc                              
Petri Simberg             Julius Summanen