Standardized Precipitation Index Table

Southeastern Climate Division

Montana, Climate Division 07

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.) 0.19 1.14 1.63 4.6 5.29 6.9 10.06 12.44 14.68 16.58 17.22 17.69 19.08 21.68 30.81 37.17 47.54 62.81 72.72 83.33
Accumulated Precipitation Departure from Normal (in.) -0.28 0.21 0.19 2.16 1.64 2.04 3.55 3.21 3.09 3.66 3.56 3.59 3.53 2.73 2.63 4.16 5.29 6.48 2.33 -1.15
Accumulated Precipitation Percent of Average 40 122 113 189 145 142 155 135 127 128 126 125 123 114 109 113 113 112 103 99
Accumulated Precipitation Percentile (non-exceedance) 10.7 73.1 67.4 98.1 89.8 91 97.1 91.8 86.2 87.9 87.5 87.7 86.9 79.1 74.2 82 83.8 84.3 63.5 45.8
Standardized Precipitation Index -1.24 0.62 0.45 2.07 1.27 1.34 1.9 1.39 1.09 1.17 1.15 1.16 1.12 0.81 0.65 0.91 0.99 1.01 0.35 -0.1