Download Brochure. The HydroBox HD TM is a portable high- resolution, shallow water echo sounder. Designed for inshore and coastal hydrographic marine surveys up to 1000 meters of water depth. Extreme ease of use, portability, and cost efficiency make this device the perfect choice for shallow water hydrography.
Guide to Helsinki weather in May The average maximum daytime temperature in Helsinki in May is a comfortable 15Â°C (59Â°F). The average night-time temperature is usually a cold 5Â°C (41Â°F).
Helsinki: Annual Weather Averages. July is the hottest month in Helsinki with an average temperature of 17Â°C (62Â°F) and the coldest is February at -6Â°C (22Â°F) . The wettest month is August with an average of 90mm of rain. The best month to swim in the sea is in August when the average sea temperature is 13Â°C (55Â°F).