Standardized Precipitation Index Table

AR Drainage Basin Climate Division

Colorado, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.49 0.79 1.15 1.69 2.08 2.69 3.17 4.44 7.33 9.45 11.3 14.11 15.7 18.77 29.45 34.34 47.65 61.66 76.32 88.02
Accumulated Precipitation Departure from Normal (in.) -1.01 -1.67 -1.87 -1.8 -1.97 -1.99 -2.48 -2.41 -1.73 -2.1 -1.97 -1.22 -2.66 -1.23 -1.2 -1 1.67 0.38 -0.25 -3.82
Accumulated Precipitation Percent of Average 33 32 38 48 51 58 56 65 81 82 85 92 85 94 96 97 104 101 100 96
Accumulated Precipitation Percentile (non-exceedance) 10.2 3.3 2.6 4.9 5.1 7 6 9.2 22.8 21.2 25.7 36.1 21.5 37.8 40.3 43 63.5 53.8 49.8 31.8
Standardized Precipitation Index -1.27 -1.85 -1.94 -1.65 -1.64 -1.48 -1.55 -1.33 -0.74 -0.8 -0.65 -0.36 -0.79 -0.31 -0.25 -0.18 0.34 0.09 -0.01 -0.47