The climate of any part of the world is due to many forces--but
basically to the amount of energy received from the sun. In mountainous
areas, such as Rocky Mountain National Park, the climate is made more
variable by the different altitudes, slopes, and exposure to solar
radiation. Like all midlatitude regions, too, the park experiences
invasions of different air masses with their varying qualities and the
storms associated with their fronts.
Few frontal storms are experienced in summer. Most of the frequent
thunderstorms are produced by the elevation and cooling warm air from
the Gulf of Mexico as it streams into the mountains from the southeast.
This season provides the great cumulus clouds that delight the
photographer. During autumn, winter, and early spring the weather is
determined by alternate invasions of cold Canadian air and cool Pacific
air. The latter brings much snow to the western side of the park, but
usually results in favorable weather on the eastern slope; the warm
chinook winds are associated with these conditions. The Canadian
air--usually heralded by blizzards on the plains below the
mountains--brings snow and below-zero temperatures to the east slope.
The winter weather at the village of Estes Park is often milder than in
most of the plains country to the east, because of the protection
afforded by the mountains from the full forces of these air movements.
In general, the weather is ideal for summer vacations, with cool, clear
nights and sunny days. The frequent afternoon showers are mere
refreshing interludes in an otherwise delightful season. The winter
weather, although often rigorous, is relatively mild for the region's
altitude, and, although the high Trail Ridge Road is snow-blocked,
scarcely ever is it a problem to drive from Estes Park village to Denver
or other plains communities.
It is always cool at night, even in midsummer, so bring warm clothes;
western garb is always socially acceptable. The region is noted for its
friendly informality. For hiking on trails and camping, old field
clothes are desirable, and stout, comfortable shoes are a necessity. A
slicker is important, since afternoon showers may be expected.