Grandpa's Winter

Iowa Climate Division 1, Precipitation, December

1895-2013 Trend is the blue +0.01"/Decade

1895-2000 is Avg:0.77" is gray

The green is the average precipitation.

Iowa Climate Division 1, Average Temperature, December

1895-2013 Trend is the blue +.1F/Decade

1895-2000 is the gray Avg:19.7F

The purple is the Avg temperature


1. Globally averaged as the warmest decade in the past 140 years, with 1998 being the warmest year on record.

2. 1977- The "North Pacific" climatic regime shift making the end of a ~30 year cool phase of the PDO (Pacific Decadal Oscillation) and the beginning of ~21 year warm phase of the PDO; extensive drought conditions in the western U.S.

3. 1930s-Dust Bowl drought impacts 100 million acres of Great Plains.

4. carbon dioxide concentrations in the atmosphere have risen from 290 parts per million (ppm) to 369 ppm, with strong evidence pointing to the burning of fossil fuels as a primary cause of these increases.

5. There has also been increased cloud cover, particularly in the Northern Hemisphere during the past century.

What trends can you determine from your graphs of temperature and precipitation where you live?

The precipitation and the average temperature do not have any drastic changes during the month.


The statement that winters were colder in the past is an accurate statement because the graph shows that the average temperature in the past was 15 and 20's and now it is more in between 20 and 30's. The precipitation has been more stable and it stayed higher and never really went down.