Standardized Precipitation Index Table

Northeastern Climate Division

Montana, Climate Division 06

Precipitation Data Table

Time Scale in Months (As of the end of Mar. 2024)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 0.72 1.27 1.57 1.68 1.87 3.51 4.57 5.81 7.04 10.29 13.43 14.05 15.05 17.69 27.07 29.23 35.29 45.2 63.81 77.78
Accumulated Precipitation Departure from Normal (in.) 0.18 0.38 0.28 0.01 -0.21 0.64 0.54 0.42 -0.17 0.2 1.28 0.91 0.62 1.68 0.79 0.11 -4.11 -7.38 -1.96 -1.14
Accumulated Precipitation Percent of Average 133 143 121 101 90 122 113 108 98 102 111 107 104 111 103 100 90 86 97 99
Accumulated Precipitation Percentile (non-exceedance) 75.5 84.2 74.5 55.2 40.6 78.8 69.7 64.4 49.1 56.4 69.9 64.6 60.8 72.1 59.6 53 20.4 10 39.5 45.1
Standardized Precipitation Index 0.69 1 0.66 0.13 -0.24 0.8 0.51 0.37 -0.02 0.16 0.52 0.38 0.27 0.59 0.24 0.07 -0.83 -1.28 -0.27 -0.12