Past IEM Features tagged: dec

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December Precip Hours

24 Dec 2015 05:40 AM
Wednesday was yet another wet December day over much of Iowa with rainfall totals approaching an inch for a swath of the state. The featured chart displays the number of hourly observations by month with measurable precipitation reported for Des Moines. The total hourly reports for December is the highest on record, according to the unofficial archive maintained by the IEM. It is also interesting to see that this month's total is higher than any other month this year! More chances for precipitating storms are in the forecast, so the total will likely be added to.

Voting:
Good: 30
Bad: 15
Abstain: 13

Tags:   dec   precip  

Beating December 1889

11 Dec 2015 05:38 AM
For Des Moines, the warmest December on record was way back in 1889. This December has certainly started off warm with yet another very warm day in Iowa on Thursday. The featured chart looks at the chances that this December could top the previous one. The method simply appends each previous year's Dec 11 - 31 period onto the end of this years Dec 1 - 10 period and computes the average temperature. None of these scenarios are able to top 1889, but a few of them come very close!

Voting:
Good: 40
Bad: 18
Abstain: 13

Tags:   dec  

Snow vs Precip Totals

31 Dec 2014 07:25 AM
While snowfall totals for Des Moines were rather paltry this December, the total precipitation was close to long term average for the month. The featured chart compares the total snowfall vs precipitation for the month of December for Des Moines. The precipitation total includes melted snowfall. Most of the snowfall this month has been confined to northern Iowa. The forecast to start the new year only has a chance of snow for this coming weekend.

Voting:
Good: 34
Bad: 18
Abstain: 20

Tags:   dec  


click image for better view

December extreme days

31 Dec 2010 06:03 AM
Thanks to a powerful push of warm and moist air on Thursday, temperatures soared and topped out at 61 degrees for Des Moines, which is two degrees short of a record. This high temperature was more than two standard deviations warmer than the average high (two sigma). The featured chart presents the combination of two sigma days against the average high and low temperature for December. The green symbols and lines are the values for 2010. The symbols are offset slightly for readability. The chart shows what one may intuitively expect, that cold months have a number of very cold days and vice versa. This year shows up as a somewhat rare combination of having a below average month along with an above two sigma warm day (yesterday).

Voting:
Good: 53
Bad: 24

Tags:   dec  


Another cold December

20 Dec 2010 05:53 AM
The featured chart presents the Iowa average December temperature along with a 30 year moving average. Five out of the past six years have seen well below temperatures, but nothing compared to 2000 or 1983. The moving average shows that the general trend has been for colder Decembers. Clicking the image will give a view back to 1893.

Voting:
Good: 25
Bad: 3

Tags:   dec  


click image for better view

Hope after a cold start

09 Dec 2010 05:50 AM
The start of December has been on the cold side with an average of just 20 degrees for Ames so far. The featured chart presents some hope for warmer weather comparing the first 8 days of December versus the remaining 23. The cold starts most frequently see warmer weather for the remaining period, but only a few are above the overall average (blue dash). The far outlier to the left in the image was 2005, where the average temperature was only 6 degrees for the first 8 days of December. Thankfully, above freezing temperatures are expected today and tomorrow.

Voting:
Good: 17
Bad: 6

Tags:   dec