Seasonal variability in climate time series is illustrated in Figures 1 though 3.
Three years (1971 -1973) of daily precipitation time series are shown in Figure 1. Boxes illustrate variability for spring and fall seasons within these three years. Comparing box heights indicates general greater range (variability) of precipitation amount during falls than during springs. Also there is a suggestion that spring precipitation is generally less than in fall.
Figure 2 shows three annual cycles of cold and warm seasons. Even visually it could be seen that the range of temperature fluctuations during cold seasons is greater than it is during warm seasons, i.e. intraseasonal variability of cold seasons is greater than that of warm seasons.
To analyze temporal variability of seasonal averages, all days within a cold season (example for DJF is shown in Figure 3) are averaged and plotted versus time. This plot illustrates interannual variability of the average temperature for the winter season.