December 2019

Section 1: Atlantic Coast

1-3: Rain and snow, followed by clear and cold weather.

4-7: Coastal storm moves along the Atlantic Seaboard, bringing a variety of precipitation types. Very cold air follows. Freeze conditions down into FL.

8-11: Dry and tranquil.

12-15: Widespread showers.

16-19: Cloud cover. Some breaks of sun, especially south. Chilly nights; mild days.

20-23: Rain and (over higher terrain) snow.

24-27: Rain (south) and snow (north).

28-31: Colder with snow over the Northeast states. Blustery winds diminish over the Southeast under a mix of clouds and sun.

Section 2: East of Mississippi River

1-3: Rain and snow shifts east into the Great Lakes and points south to Gulf Coast, followed by clear and cold weather.

4-7: Storm from TX moves up to OH River Valley, then New England, heavy, rain and snow across northern portions of MS, AL, and TN. Very cold air follows. Freeze conditions down into the FL panhandle.

8-11: A “winterlude” for Great Lakes and OH Valley. Dry weather down to the Gulf Coast.

12-15: Showery and milder weather.

16-19: Another “wintermission”. Nights are cold; days are milder.

20-23: Rain or snow.

24-27: Sunshine; cold and dry weather prevails. Rains near and along the Gulf Coast.

28-31: Cold and dry.

Section 3: Rockies to Mississippi River

1-3: Stormy conditions prevail: rain, snow, and strong winds are followed by clear and cold weather.

4-7: One storm from the Pacific Northwest moves to the Northern Plains by the 7th. Another developing over TX moves northeast, bringing widespread rain and wet snow.

8-11: More rain or wet snow.

12-15: Pacific storm brings widespread unsettled weather yet again.

16-19: A passing snow or rain shower.

20-23: Waves of storminess from AK produce periods of heavy rain and snow, as a series of low-pressure disturbances enter WA state and then propagate to the east. Bitterly cold temperatures follow.

24-27: Generally fair, dry, and very cold.

28-31: Moisture and energy from the Pacific Northwest brings a renewed threat of rain and snow as the year comes to a close.

Section 4: Pacific Coast to Rockies

1-3: From the Pacific Northwest Coast to the western slopes of the Rockies, stormy conditions prevail. Rain and (over higher terrain areas) wet snow then shift east.

4-7: Another storm from the Pacific Northwest moves to the Northern Rockies. Scattered precipitation across the Southwest.

8-11: Partly to mostly cloudy, with some occasional breaks of sun; residual showers. Storm develops over the Rockies.

12-15: Pacific storm brings unsettled conditions with widespread rain and snow.

16-19: Partly to mostly cloudy skies. Lingering showers still possible.

20-23: Periods of heavy rain and snow as a series of low-pressure disturbances enter WA state and then propagate to the east. Showery over the South-west.

24-27: Skies are generally fair, dry, and cold for Christmas.

28-31: Another slug of moisture and energy hits the Pacific Northwest and heads east. Meanwhile, the Southwest ends the year on a dry and chilly note.