The effects of cold temperatures and chilling winds normally result in this off cast. It is part of the plant's response to the changing of the season. In most seasons this effect is mild and not long lasting. In extremely cold winters there could be a loss of foliage or twig dieback depending on the type of plant. This winter with the extremely dry conditions the off color could be the result of drought.
Evergreens tend to use and lose more moisture over winter than deciduous plants.
To help overcome the dry soil, a deep soaking would be recommended. Dry conditions will weaken the roots and plants which could result in a decline in growth or death.