Venus Square Uranus...

starts on December 19 (using a 1 degree orb), is exact on December 20 in Kilmore at 12.52pm, leaves on December 21.  Venus at 22 degrees and 50 minutes of Sagittarius, Uranus at 22 degrees and 50 minutes of Pisces.

The planet of ease and abundance, enjoyment and pleasure, connecting with the jolting Uranus now through a square is likely to mean unexpected developments or realisations regarding finances, values and/or friendships (depending on which houses are involved in your birth chart). 

Squares are associated with a turning point, which is often surrounded by a sense of tension just before it is achieved.  Because this combination is happening in mutuable signs I get the feeling that this turning point will be best reached through compromise on both sides... although you'll probably find that Venus will do a little more compromise than Uranus! (because Venus doesn't generally like to create a scene, whereas Uranus loves to shake things up a bit).

As usual, look to see where this square is falling in the birth chart, and which houses are ruled by Venus (ones with Taurus or Libra on the cusp or intercepted in it), and Uranus (Aquarius on the cusp or in it).  If you happen to have personal planets/points in Sagittarius and/or Pisces then you are likely to feel this aspect quite strongly... Gemini and Virgo are also likely to get a strong dose of this aspect too!