Minus 41 °C

In 1999, the lowest temperature so far was measured in Luleå. The thermometer showed -41°C.
The Swedish record is -52°C.
Greatest snow depth: 113 cm.

Average temperatures

November: -4°C.
December: -8°C.
January: -10°C.
February: -10°C.
March: -5°C.

Why does the sea freeze?

The Gulf of Bothnia has brackish water, a mixture of freshwater and saltwater. The reason behind this is that eight major rivers flow out into the gulf. The Gulf of Bothnia is estimated to be approximately. 4/5 parts freshwater, making it the most freshwater-diluted sea water area in the world. That is why the sea freezes here every year.