Vaisala - Company Announcement

Vaisala's January - June results published on August 4

Vaisala Corporation            Stock Exchange Release        July 27, 2011 at
9:30 a.m.

Vaisala publishes its Q2/2011 results on Thursday, August 4, 2011 at 9:00 a.m.
The stock exchange release will be available on the company website
atwww.vaisala.com. CEO's presentation will be published at 12:00 (GMT +3) on the
same day at www.vaisala.com/investors.

Briefing
Briefing for analysts and media will be arranged in Hotel Kämp, Paavo Nurmi
meeting room, Pohjoisesplanadi 29, Helsinki, starting at 12:00 a.m. Please
register to the briefing by email toliisa.ahtiluoto@vaisala.com.

Audiocast
A live audiocast of the presentation of Kjell Forsén, President and CEO of
Vaisala, will be sent starting at 12:00 a.m. (GMT +3). The audiocast will be
available atwww.vaisala.com/investors. It will be recorded and published at
2:00 p.m. (GMT +3) at the same address on the same day.


More information: Helena Marjaranta, SVP Communications, tel. +358 40 5819 102


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Vaisala is a global leader in environmental and industrial measurement. Building
on 75 years of experience, Vaisala contributes to a better quality of life by
providing a comprehensive range of innovative observation and measurement
products and services for meteorology, weather critical operations and
controlled environments. Headquartered in Finland, Vaisala employs over 1300
professionals worldwide and is listed on the NASDAQ OMX Helsinki stock
exchange.www.vaisala.com



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