Summons to the Annual General Meeting 2006

Vaisala Oyj’s Annual General Meeting will be held on Thursday March 22, 2007, at 5 p.m. at the company’s head office, Vanha Nurmijärventie 21, 01670 Vantaa.

Following items will be on the agenda of the Annual General Meeting:

1. Items specified in Article 13 of the Articles of Association.

Right of attendance

Shareholders who are registered in the company’s share register maintained by the Finnish Central Securities Depository Ltd by 12 March 2007 may attend the Annual General Meeting. Shareholders whose shares have not been transferred to the book-entry securities system may also attend the Annual General Meeting provided that such shareholders were registered in the company’s share register before 21 October 1994. In such cases, shareholders must present evidence that their shareholding rights have not been transferred to the book-entry securities system.

Documentation

Documents relating to financial statements and the Board’s proposals to the Annual General Meeting are available as copies for the shareholders to see at the company’s head office in Vantaa, Vanha Nurmijärventie 21, for a week before the Annual General Meeting. On request, copies will be sent to shareholders.

Notice of attendance

Shareholders wishing to attend the Annual General Meeting must notify the company no later than 4 p.m. on Wednesday 14 March 2007. Notification can be made either by letter addressed to Vaisala Oyj, Nina Andersin, P.O.Box 26, FIN-00421 Helsinki, Finland, by telefax to +358 9 8949 2206, by e-mail at nina.andersin@vaisala.com , or by telephone on weekdays between 9 to 11 a.m., tel. +358 9 8949 2201. Letter authorizing a proxy to vote on behalf of a shareholder should be sent to the company before expiry of the notification.

Election of the members of the Board of Directors and auditors

Board member Yrjö Neuvo is in turn to retire by rotation. Shareholders representing more than 10 percent of all the votes in the company have informed that they will propose to the Annual General Meeting held on 22 March 2007 that the number of Board members should be six. The Board proposes the re-election of Mr Yrjö Neuvo. The Board also proposes Ms Maija Torkko as a new member.

The Board proposes PricewaterhouseCoopers Oy and Mr Hannu Pellinen APA, to be selected as Vaisala Oyj's Authorized Public Accountants. The proposed members of the Board of Directors and the Authorized Public Accountants have given their consent for the election.