The United State Drought Monitor publishes weekly assessment of drought levels of the U.S. Historical data for the State of California is available from Jan 4, 2001 up to present. Add description of drought categories.
library(reshape2)
library(ggplot2)
library(scales)
## Error: object 'variable' not found
Produced by T. A. Ghezzehei, using data from US Drought Monitroing
The U.S. Drought Monitor is produced in partnership between the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, and the National Oceanic and Atmospheric Administration. The data used in this analysis is available free of charge at http://droughtmonitor.unl.edu