Standardized Precipitation Index Table

South Central Climate Division

Montana, Climate Division 05

Precipitation Data Table

Time Scale in Months (As of the end of Feb. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.19 1.69 2.09 2.43 5.03 7.01 8.71 9.88 15.9 18.37 19.41 21.03 24.22 28.16 40.2 45.42 53.02 69.08 90.9 112.54
Accumulated Precipitation Departure from Normal (in.) 0.29 -0.23 -0.77 -1.51 -0.32 0.14 0.67 0.5 3.99 3.75 2.97 3.29 3.6 3.54 4.74 3.09 -0.15 -1.85 2.23 6.15
Accumulated Precipitation Percent of Average 132 88 73 62 94 102 108 105 134 126 118 119 117 114 113 107 100 97 103 106
Accumulated Precipitation Percentile (non-exceedance) 79.1 40.7 18.6 6.9 42.6 56.6 67.1 62.5 94.4 90.1 84.6 86.5 87.3 83.9 85.6 74.3 50.4 40.5 62.2 76.2
Standardized Precipitation Index 0.81 -0.24 -0.89 -1.48 -0.19 0.17 0.44 0.32 1.59 1.29 1.02 1.1 1.14 0.99 1.06 0.65 0.01 -0.24 0.31 0.71