Standardized Precipitation Index Table

Southwest Climate Division

Arizona, Climate Division 05

Precipitation Data Table

Time Scale in Months (As of the end of Jul. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.22 0.23 0.23 0.24 0.31 0.45 0.54 0.73 2.24 2.89 4.44 5.64 6.04 6.62 6.92 8.9 13.1 19.05 22.7 25.59
Accumulated Precipitation Departure from Normal (in.) -0.34 -0.35 -0.4 -0.54 -0.92 -1.38 -1.93 -2.36 -1.19 -0.9 0.15 0.46 0.23 -0.4 -3.46 -3.33 -2.5 -1.78 -3.36 -5.74
Accumulated Precipitation Percent of Average 39 39 37 31 25 25 22 24 65 76 103 109 104 94 67 73 84 91 87 82
Accumulated Precipitation Percentile (non-exceedance) 25.1 22.6 18.5 11 3.5 4 2.6 2.3 27.4 36.6 59.1 63.5 59.1 47.9 10.9 14.7 25.9 35.5 24.8 13.5
Standardized Precipitation Index -0.67 -0.75 -0.9 -1.23 -1.82 -1.75 -1.95 -1.99 -0.6 -0.34 0.23 0.34 0.23 -0.05 -1.23 -1.05 -0.65 -0.37 -0.68 -1.11