*3.1. Precipitation*

Precipitation accumulation for each measurement period had an annual mean of 22.2 mm, with the highest seasonal mean accumulation in winter (26.3 mm) and spring (24.3 mm), and the lowest in autumn (15.3 mm) (Table 1). Likewise, the duration of precipitation had an annual mean of 278.7 min, but the longest seasonal mean duration was received in winter (424.7 min), and the shortest in autumn (192.5 min). Both average and maximum precipitation intensity were higher in summer months (0.1 mm/min and 108.1 mm/min, respectively) compared to the annual values of these parameters (0.08 and 71.5 mm/min, respectively).

The study area experienced year-round precipitation, however, most of the accumulation was in winter (frontal systems) and summer (convectional storms) (Figure 2). September and October were the driest months, most notably in 2012, 2013, and 2016. The most intense rains occurred in summer months, for example, see high values for Average Intensity (AvgInt) in the summer of 2012, 2014, 2016, 2017, 2018, and to a lesser degree 2013 and 2015. One may also notice that when Total Accumulation (TotAccum) was high and Duration was low, Maximum Intensity (MaxInt) was also

high because it follows that higher intensity rainfall occurred when high rainfall totals were received in a short time-period.


**Table 1.** Descriptive statistics of precipitation parameters by measurement period.

**Figure 2.** Time series of precipitation parameters. AvgInt and MaxInt refer to average and maximum precipitation intensity, respectively. TotAccum is the total depth of precipitation received during each weekly measurement period, and Duration is the total minutes during which precipitation was measured, for each measurement period. Columns delineate seasons (Su = summer, A = autumn, W = winter, and Sp = spring).
