I have analysed the annual rainfalls at thirteen stations in the central region of USA. These are all long-term records with data from as far back as 1841 (Milwaukee) and all stations have data up to 2017. These stations each have between 128 and 167 years of complete annual data.
The only data that I have been able to locate is that on the KNMI (Royal Netherlands Meteorological Institute) website.
The following are plots of the annual (Jan-Dec) rainfalls at each of the thirteen stations. The red line is of the five-year average rainfall.
North Platte 1875-2017
Des Moines 1877-2017
Dodge City 1874-2017
Oklahoma City 1891-2017
St Louis 1837-2017
The thirteen selected stations are representative of the central region of the US.
The data availability is good with few periods of missing data.
All of the thirteen stations show a relatively constant trend over the past 150 years, although periodic droughts and wet periods are evident at all stations.
There is no evidence of abnormal rainfall trends during the past 20 years.
Please let me know what you think of my analyses. firstname.lastname@example.org
This article was written by Brian Gunter of Narooma, NSW, Australia. In his previous life Brian was an engineering hydrologist involved over many years in the analysis of rainfall and river flow data for the planning of water resources projects in Australia, Asia and Africa. In recent years he has been one of the Marine Rescue NSW (previously Royal Volunteer Coastal Patrol) volunteer weather observers who operate the Narooma station for the Bureau of Meteorology.