Vaisala Oyj

Earnings Release • Dec 31, 2013

Vaisala Corporation Stock Exchange Release December 31, 2013 at 9:00 a.m.

Vaisala Signs a Significant Contract for Radiosondes

Vaisala has signed a contract to deliver radiosondes to its long-term customer. The deliveries start at the end of 2014 and will be completed during the summer of 2018. The value of the deal is EUR 11.0 million.

Radiosondes are meteorological devices that are used to measure pressure, temperature, humidity, wind speed and direction in the upper atmosphere. The radiosonde reaches an altitude of up to 30 kilometers and transmits continuous data to ground equipment during its ascent. The ground-based sounding system processes the data and converts it into meteorological weather messages.

For Further Information Please Contact:

Kai Konola, Executive Vice President of Vaisala Weather Business Tel. +358 40 5024 900, kai.konola[at]vaisala.com

Distribution:

NASDAQ OMX Helsinki Key media www.vaisala.com

About Vaisala

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 1,400 professionals worldwide and is listed on the NASDAQ OMX Helsinki stock exchange. www.vaisala.com www.twitter.com/VaisalaGroup