Standardized Precipitation Index Table

CO Drainage Basin (S) Climate Division

Colorado, Climate Division 02

Precipitation Data Table

Time Scale in Months (As of the end of Sep. 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.1 1.53 2.62 3.53 4.24 5.24 7.25 8.75 10.16 12.38 13.94 15.02 17.28 23.7 38.46 43.93 51.09 71.7 92.94 113.67
Accumulated Precipitation Departure from Normal (in.) -0.59 -1.94 -2.46 -2.55 -3.49 -4.47 -4.51 -4.82 -5.27 -4.84 -4.88 -5.6 -8.44 -6.66 -2.82 -7.11 -10.81 -10.9 -10.39 -10.41
Accumulated Precipitation Percent of Average 65 44 52 58 55 54 62 64 66 72 74 73 67 78 93 86 83 87 90 92
Accumulated Precipitation Percentile (non-exceedance) 31.8 2.2 2.3 4 1.5 0.6 1.8 1.5 1.7 3.9 5.2 3.9 0.5 3.5 27.5 8.1 2.6 5.1 8.3 10
Standardized Precipitation Index -0.47 -2.02 -1.99 -1.75 -2.17 -2.52 -2.09 -2.18 -2.12 -1.76 -1.63 -1.76 -2.58 -1.81 -0.6 -1.4 -1.94 -1.64 -1.38 -1.28