I found a cool website in which you can input your latitude and longitude (or your zip code if you're in America) and get a chart of the sun's seasonal position at your location.
Thanks to Google Maps, I have the precise location of our house, so after a bit of data entry- voilà! (I will admit to spending a good part of the morning entering various locations and playing with the chart output.)
When we arrive in December for a short visit, we'll have (fairly weak) sunshine only from 8:30 and 14:30. But next midsummer, we'll have sunshine between 2:30 and 21:30! Better buy some window shades.