The days are also at their longest in summer, with the solstice in late June offering over 20 hours of daylight. The summer sun provides so much light, the Aurora Borealis is unlikely to be seen until late August. As daylight hours rapidly decrease in the fall, however, chances of seeing the Northern Lights increase. While snow can fall even in summer, snow that arrives in September tends to stay rather than melt away. Winter announces its arrival not just with snow, but with extreme temperatures and ever-less sunlight. Access into the park and services offered are limited between late September and late April, though self-sufficient folks will find plenty to do in winter. Temperatures can be well below 0 F by November, and on the winter solstice - just before Christmas - Denali receives less than 5 hours of true daylight.
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