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).
In winter, northern Finland is covered by snow from November to April. In the south, the snow usually arrives in December-but the amount of snowfall may vary from one year to another. North of the Arctic Circle, the winter includes a period known as the polar night, when the sun does not rise above the horizon at all. In the northernmost extremity of Finland, the polar night lasts for 51 days. In southern Finland, the shortest day is about 6 hours long. In winter, temperatures of -20Â°C are not uncommon in many areas. The average temperature in Helsinki in July is +17Â°C and in February -5,7Â°C. Obviously, the winter temperatures in Finnish Lapland can be much lower.