- Histogram of PRCP observations by year at station (far left)
- Grey bars - show number of PRCP observations at station during each winter, with maximum of 151 (or 152 for leap years)
- Black bars - days with non-zero recorded PRCP that winter
- Red bars - days with extreme high PRCP that winter
- Histogram of extreme NAM days by year (yellow field)
- Red bars - show number of extreme high NAM days in NDJFM winter months
- Blue bars - show number of extreme low NAM days in NDJFM winter months
- Histogram of extreme PNA days by year (green field)
- Red bars - show number of extreme high PNA days in NDJFM winter months
- Blue bars - show number of extreme low PNA days in NDJFM winter months
- Years of extreme CTI (purple field)
- Red bars - shows years of moderate to strong El Niño
- Blue bars - shows years of moderate to strong La Niña
- Winter year is defined by the year of the January. End of year months of 1947 are not included in 1948 winter data, while end of year months of 1997 are included in calculations but not shown in distribution figure.
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