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Fri, Dec. 7, 2012, 8:06 a.m.

Boulder Weather

Avg. High: 47° F
Avg. Low: 23° F

Max. High: 76° F (1979)
Min. Low: -24° F (1988)

Avg. Precip: 0.9
Max. Precip: 4.20" (1913)

Average Snow: 13.0"
Max. Snow: 52.5" (1913)

Max wind: 120

December Wildflowers

Gumweed (Grindelia squarrosa)

Early Easter daisies
(Townsendia hookerii and T. exscapa)

An immature trumpeter swan overwintered at the Marshall gravel ponds, along South Boulder Creek Trail, in 2005.

A new late-fall tradition in Boulder County is the annual appearance of one or more trumpeter swans on prairie lakes and ponds. The swans usually show up just as the last open water is freezing over and most waterfowl have headed farther south.
Trumpeter swans disappeared from most of the prairie region during the first two-thirds of the 20th century. By the 1950s these majestic birds had grown very rare. Protection from hunting, along with reintroduction programs in the northern Rockies and northern plains, have helped populations to recover.
Several hundred pairs now nest in the Greater Yellowstone Basin, the Dakotas, and the Nebraska Sandhills. Several thousand pairs nest from western Alaska south and east into the Canadian prairies. In December look for migrating trumpeters, and an occasional stray tundra swan, at Boulder Reservoir, Baseline Reservoir, Sawhill Ponds, and Lake Valley Pond.

Other December Events

• Early Easter daisies (Townsendia hookerii and T. exscapa) begin to bloom
  on south-facing shales in foothills canyons.
• The Boulder and Longmont Christmas bird counts are held during the last
  or second-last weekend before Christmas. New volunteers are always welcome: www.boulderaudubon.org
• Mule deer finish up sparring maneuvers and begin shedding antlers.
  Bighorn sheep continue dueling on high mountain escarpments.
• American dippers migrate down from the mountains to fish for aquatic
  insects in Boulder and St. Vrain Creeks. Look for them along the Boulder
  Creek Trail just north of Walden Ponds.
• Pasture sage and fringed sage leaf out on sunny hillsides.

December 2011 Events

December 10-11: The full moon rises at 4:52 p.m. Dec 10.

December 13-14: Geminids meteor shower peaks. Look toward the constellation Gemini after midnight or before sunrise on the 14th. The moon will be in a waning gibbous phase in 2011 during the shower’s peak. That means the moon will rise in mid-evening and shine all the way until daybreak, so 2011 does not provide optimum conditions for watching the Geminids.

• Frost on Lodge (Lakota)
• Popping Trees (Arapaho)
• When the Deer Run Together (Cheyenne)

All photos: Steve Jones

Read Ruth Carol Cushman and Stephen Jones's Nature Almanac column in the Daily Camera "Get Out" section the first Friday of each month.

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