This means that precipitation effects are dependent on precipitation frequency as well as annual amount. (geosci.uchicago.edu)
A decrease in precipitation frequency translates into even more year - to - year variability in fresh water resources for the Southwest. (sciencedaily.com)
Figure 3 shows the relationship between observed surface air temperature and observed precipitation frequency for 28 summers, demonstrating that summers were hotter when it rained less often. (giss.nasa.gov)