Cold Start to December (Updated)

2009 December Temperature Summary
Location 2009 Dec Average Temp (F) Departure from Normal (F) Coldest High Temp So Far Cold Temp So Far
Bismarck 6.9 -11.1 -2 (Dec 13th) -17 (Dec 15th)
Williston 1.4 -14.2 -8 (Dec 13th) -27 (Dec 15th)
Dickinson 3.6 -16.8 -8 (Dec 13th) -26 (Dec 15th)
Jamestown 4.4 -12.2 -5 (Dec 13th) -14 (Dec 15th)
Minot 2.0

-15.5

-10 (Dec 13th) -17 (Dec 15th)
Why So Cold?

Shown above is the weather pattern in the mid levels of the atmosphere averaged over the first 13 days of the month of December. The cool colors (blue/purple) represent relatively low pressure in the mid level of the atmosphere, resulting from a large mid to upper level trough. This trough is responsible for the cold weather experienced thus far across western and central North Dakota. Colder than average temperatures are forecast to continue for the next 7 days.
Roller Coaster Temperatures this Fall

Shown above in the top graph depicts how temperatures have compared to average for the past year. Red signifies above average temperatures, and blue below average. As can be seen September was warm, October was cold, followed by a warm November, and a cold start to December. The bottom graph gives daily high temperatures (red) and daily low temperatures (blue). All temperatures are in Celsius


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