The University of Arizona

SW Monsoon Tracker - Oct 2021 | CLIMAS

 SW Climate Outlook

SW Monsoon Tracker - Oct 2021

2021 SW Monsoon Recap

What a difference a year makes! Percent of average and percent of days with rain for 2021 (Figs 1-2, p. 5) compared to 2020 (Figs. 5-6, p. 7) provide a stark reminder of the shift in monsoon precipitation was observed in the Southwest over the past two years. At the station level, some sites came close to the record, most sites recorded above normal, and nearly all recorded more precipitation in 2021 Vs. 2020 (see Fig. 4 for examples across the Southwest). The daily accumulation plots for select stations in the Southwest show when and how precipitation fell (Fig. 3, p. 6). For the most part, these totals were achieved through regular and persistent storm activity in July and August and not a few large events on just a few days. 2021 will be a hard act to follow, especially in the parts of the Southwest that saw near record totals. Regardless of the records, 2021 was a welcome and needed pivot from 2020.


Online Resources

  • Figures 1-2 - UA Climate Science Applications Program - cals.arizona.edu/climate - Data: PRISM
  • Figure 3 - CLIMAS: Climate Assessment for the Southwest - climas.arizona.edu - Data: ACIS & MesoWest
  • Figure 4 - CLIMAS: Climate Assessment for the Southwest - climas.arizona.edu - Data: NWS Monsoon Tracker
  • Figures 5-6 - UA Climate Science Applications Program - cals.arizona.edu/climate - Data: PRISM