The following images show changes in mean annual precipitation each decade since the 70’s. 

It is interesting to see these decadal changes, which are often quite significant.  For example, the 70’s decade was unusually dry across the Southeast U.S. while the following decade was unusually wet. 

These changes are likely due to a combination of natural decadal oscillations, such as the Pacific Decadal Oscillation and Atlantic Multi-Decadal Oscillation as well as longer-term climate change. 

The above data, 2000 – 2009, indicates a decadal increase in precipitation across a majority of the nation. The following timeline plot indicates that this trend of increased annual precipitation likely has continued through recent years.

Let’s focus on a closer look at a plot of annual precipitation (since 1969) for the important Midwest agricultural region. Note the significant uptick in annual precipitation over the past 10 years. 

2019 Wettest Year Of Record?

Although the final numbers will not be available until next week, it is looking like 2019 will be the wettest year on record.