Our first Föhn days of this spring are ahead of us: the Föhn is a very warm fall wind blowing from southern directions whenever a cyclone is stuck beyond (that is, south) of the Alps.
I won't be in Vienna but in Mühlviertel when, supposedly, on friday Föhn will bring the temperature up to probably twenty degrees Celsius.
But tomorrow might already be rather warm, so probably I'll try and ride on my bicycle out to Lobau tomorrow.
This is the Danube National Park, taken on last sunday, although not the Lobau part but quite some distance further downstream; it looks much warmer here on the photo than it actually was: