Scotland's climate is generally milder than expected (considering its location), as all of the British Isles are warmed some by the Gulf Stream and North Atlantic Drift.
There certainly are exceptions, but generally winters in Scotland are damp, cool/cold and windy, and summers rather pleasant with frequent cloudy days.
Precipitation is possible at most anytime. The upper reaches of the Northern Highlands (can-and-do) experience very cold and snowy winters, and rapidly changing weather conditions with little advance warning.
In the far north during the summer months, the dark of night is hardly felt as the sun never totally sets. In winter the sun is seldom seen.
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