Currently central and northern Europe are experiencing a very cold, false-spring like weather phenomenon.
When i look at local weather charts, the daily temperature cycle seems to be completely gone, and replaced by a constant -8°C to -10°C, see below for an example of southern Sweden.
Taking a look at ventusky.com we also see that the cold air is being advected from colder regions in Europe to southern Sweden, as seen in this screencap:
Other locations don't display this behaviour any more: The farther south I look, i.e. Berlin and Munich, the stronger the daily fluctuations get again, see both for comparison:
This 'constant temperature' seems odd enough for me to ask the question:
Is the constant temperature here in southern Sweden for a few days a lucky coincidence of temperature advection sources, or is this a known phenomenon and there is some interesting physics behind this?