Vaisala Oyj

Report Publication Announcement • Apr 17, 2013

Disclosure 306517

Vaisala - Company Announcement

Vaisala's January-March 2013 Results Published on April 24, 2013

Vaisala Corporation Stock Exchange Release April 17, 2013 at 2:00 p.m. Vaisala publishes its January-March 2013 results on Wednesday, April 24, 2013 at 2 p.m. (EEST). The stock exchange release and interim report will be available on Vaisala's website at www.vaisala.com. The CEO's presentation will be published at www.vaisala.com/investors at 4 p.m. (EEST) on the same day. Briefing Briefing for analysts and media will be arranged in Hotel Kämp, Paavo Nurmi meeting room, Pohjoisesplanadi 29, Helsinki, on Wednesday, April 24, 2013 starting at 4 p.m. (EEST). Please register to the briefing by e-mail to liisa.ahtiluoto@vaisala.com. The presentation of Kjell Forsén, President and CEO, at the briefing will be audiocast live at www.vaisala.com/investors. It will also be published at the same address as a recording by 6 p.m. (EEST) on the same day. More information: Liisa Ahtiluoto, Communications Director Tel. +358 40 730 7695 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 chosen weather-related and industrial markets. Headquartered in Finland, Vaisala employs approximately 1400 professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange. www.vaisala.com www.twitter.com/VaisalaGroup Distribution: OMX Nordic Exchange Helsinki Main media www.vaisala.com [HUG#1693703]