Standardized Precipitation Index Table

Northwest Climate Division

North Dakota, Climate Division 01

Precipitation Data Table

Time Scale in Months (As of the end of May 2020)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.06 1.5 1.86 2.01 2.33 2.68 3.49 4.39 11.24 13.97 17.25 20.19 22.17 24.07 34.83 38.92 45.79 62.99 80.25 96.91
Accumulated Precipitation Departure from Normal (in.) -1.1 -1.82 -2.1 -2.39 -2.55 -2.7 -2.45 -2.49 2.83 3.72 4.68 4.28 2.28 2.8 3.09 1.8 -1.8 -0.52 0.82 1.56
Accumulated Precipitation Percent of Average 49 45 47 46 48 50 59 64 134 136 137 127 111 113 110 105 96 99 101 102
Accumulated Precipitation Percentile (non-exceedance) 22.2 9.7 6.8 3.8 3.3 2.8 5.4 7 89.4 92.6 94.8 89.9 74.1 78.3 75.6 65.6 38.7 48.2 55.6 58.5
Standardized Precipitation Index -0.77 -1.3 -1.49 -1.77 -1.83 -1.92 -1.6 -1.48 1.25 1.45 1.62 1.28 0.65 0.78 0.69 0.4 -0.29 -0.04 0.14 0.21