December, 12th Month - Has 31 Days
December 2010 – SWIN Wx Forecast
Conjecture of the Weather and Climate
December has 31 days. Average temperature is 36.1 degrees. The average temperature typically drops from 39.5 degrees at the 1st of December to near 34.9 degrees by the 31st. Record low of -15.0 degrees below zero occurred on December 22,1989. A record high of 77.0 degrees on December 2, 1982. Coldest December ever (average temperature) was 23.0 degrees set a record for 1989. Warmest December on record was set in 1923 with a average temperature of 46.7 degrees.
Normal precipitation is 3.41" inches. Wettest December, 8.23" inches was set in 1982. Driest, 0.56" inches in 1976. Monthly mean snowfall is 3.1" inches. Snowest December on reord is 11.5" inches in December of 2000.
December 2010 is expected be wetter, but also colder then normal on temperature.
Last of November 29th, 30th rain showers enter mainly after dark. Occasionally moderate rain on the 30th (early), ending briefly, and turning colder after mid-morning. Flurries, or light snow mainly after 10PM on the 30th.
December 02nd, 03rd.
Snow, or sleet. Cold blustry front moves through precip may turn over to sleet, or flurries before ending briefly. Another storm is developing over Rockies.
December 5th, New Moon. Systems slowing...weather tends to stretch out a day, or two longer.
Cold 4th, 5th Cold rain as system approaches from the west after dark on the 4th. May be snow at times especially along I-70. A zonal E to W jet stream could keep threat of wintry precip ongoing during late evening, early morning for a day, or two longer. Turning much colder 5th through 6. NW winds blow another day.
9th
Another snow storm moves our way. Cold, wet generally means snow when warmer moist air over runs colder air near the surface. Snow, then colder NW winds as High pressure builds in on 10th through 12th. Warming trend not too far off.
13th Mild to warm air advecting northward. Also happen to be Luna apogee, 1st Quarter. Spotty nusense showers may be around early morning along with whipping winds at times through noon as a dry cold front moves through, but any frontal showers about about won’t make it to the ground as a general rule. NW whipping winds, but winds shift back to the south around the 14th, and 15th.
17th Venus opposition to Gibbous Waxing Moon
Snowstorm over the lower Great Lakes. Some areas may get a ice storm, or sleet. Low over the Great Lakes may become a closed low becoming stationary. This may keep it windy especially over northern areas of Indiana 18th, 19th. Brisk SW wind brings a warming for a day, or two.
21st
Max low temperature is reached. Many will enjoy the warmer mornings, but it’s also windy, and possible isolated TS late in the day. Low pressure from the Denver area will have a tendency to travel NE rather to the east, and the jet stream is also further north on the 22nd, but jet stream should start to decend back south along with colder air.
24th, and 25th
A low in the Gulf spreads moisture northward in the form of snow for parts of Indiana. It is rare to get a White Christmas. This could become a major snow storm once it travels to the New England area. Some light intermittent snows are possible behind departing storm (low) on the 26th. The cold air has won out over the warm moist air. Historically the dates of 08-13-14-16, and the 30th have brought more snows then other dates in general. Merry Christmas!
28th to the 30th
Brings warming showers rains with easterly brisk winds from a low in the Gulf.
31st. Happy New Year. Overall December will be below normal, and wetter then normal.
A warm start to the New Year. Any showers about first few days of 2011 will tend to form generally after dark.
Wally
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