I have analysed the annual rainfalls at seven stations in the eastern region of USA. These are all long-term records with data from as far back as 1820 (Philadelphia) and all stations have data up to 2017. These stations each have between 136 and 193 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 seven stations. The red line is of the five-year average rainfall.
This analysis of the rainfall at 7 locations in the eastern region of the USA has been repeated for the western region (9 locations) and the central region (13 locations):
The seven selected stations are representative of the eastern region of the US.
The data availability is good with few periods of missing data.
All of the seven stations show a relatively constant trend over the past 150-200 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.