Re the weather, soil etc all is correct, but this is the time to note the dark, dull areas & plan to do something about it now. Visit a good independant garden centre every two weeks from now & note the increasing amount of colour available for your garden as the weeks pass. Ask questions so that you can choose suitable plants for each area.
Think colour & if there are no plants that suit a problem spot think about an ornament, trellis panel or structure that draws the eye & gives a sense of impact. Don'r forget that there are some great garden paints to use on wood or brick to brighten a dull area. Have fun