Figure 4

(a) Average temperature (solid lines, left y-axis) and t-statistic comparing neighboring nine, twelve, and fifteen-day periods before, and beginning with, each calendar day (dot-dashed lines, right y-axis). The t-statistic shown is the averaged t-statistic of the three period lengths. (b) identical presentation for wind, (c) fraction of each calendar day during which precipitation was measured, (d) total lightning discharges, (e) average relative humidity, and (f) incident shortwave (solar) radiation.