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 Jan. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.54 0.93 1.54 2.02 3.29 6.18 8.3 10.15 12.96 13.68 14.25 14.55 17.61 22.28 31.52 37.31 48.93 62.67 77.85 88.58
Accumulated Precipitation Departure from Normal (in.) 0.07 -0.09 -0.11 -0.6 -0.53 0.15 -0.22 -0.09 0.66 -0.12 -0.52 -0.78 0.64 0.93 0.86 0.63 2.94 1.38 1.27 -3.31
Accumulated Precipitation Percent of Average 115 91 93 77 86 103 97 99 105 99 96 95 104 104 103 102 106 102 102 96
Accumulated Precipitation Percentile (non-exceedance) 67 47.3 47.7 30.1 36.5 57.2 48.7 51.4 63 50.9 45.1 41.1 60.8 63 59.9 57.1 71.8 60 58.3 34.3
Standardized Precipitation Index 0.44 -0.07 -0.06 -0.52 -0.35 0.18 -0.03 0.04 0.33 0.02 -0.12 -0.22 0.27 0.33 0.25 0.18 0.58 0.25 0.21 -0.4