VAISALA OY A revenue for the last year amounted to 564.60 M EUR, the most of which — 338.20 M EUR — came from its highest performing source at the moment, Weather and Environment, the year earlier bringing 313.10 M EUR. The greatest contribution to the revenue figure was made by Finland — last year it brought VAISALA OY A 400.50 M EUR, and the year before that — 358.80 M EUR.