They typically preset flower buds many months before they flower. Thus, if you pruned azaleas and rhododendrons now, you'd be removing the flower buds, and there would be no blooms this year. Prune spring-flowering bulbs right after the flowers fade. Usually needled evergreens should be pruned sparingly and only as necessary to restore shape or remove damaged branches. Shorter, stouter limbs are better able to withstand snow loads with little breakage.
Longer limbs tend to hold more snow and break under the burden.
Observe where snowdrifts form. If drifts consistently block driveways, walkways, and doors, you may want to add or remove landscape plants or structures to deflect winter winds. Since winds drop snow where something slows them down, adding or removing hedges or fences can make a big difference. Boxwood, yews, and other evergreens can be planted as snowbreaks as long as you keep them safe from the threat of roof avalanches. Observing other people's grounds can give you ideas on using natural snowbreaks, as well as adding color and interest in the winterscape.