Cooperative Observer Water Year Precipitation
Southeast/South Central Montana and Sheridan County, Wyoming
PRELIMINARY WATER YEAR PRECIPITATION TOTALS
DATA AS OF: SEPTEMBER 2026
NOTE: Precipitation totals preceding an "*" character may be low,
because of one or more daily reports are missing in the database.
Use this data with caution.
BIG HORN COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BSBM8 BUSBY 3.06 0.37 1.25 0.04* 0.20 1.04 2.84 1.51 2.83 0.00 0.64 1.91* 15.69 -0.03 100
HDNM8 HARDIN 3.33 0.39 1.02 0.20 0.85 1.27* 1.48 2.12 2.41* 0.42 0.59 4.24 18.32 +4.57 133
BHRM8 YELLOWTAIL DAM 4.07* 0.40* 3.38* 0.30* 0.32* 2.20* 1.89* 1.97* 3.36* 0.80* 0.88* 1.03 M M M
CARBON COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BDGM8 BRIDGER 2 N 1.97 T 0.43 T 0.22 0.62 0.23 1.83 1.27 1.21 0.51 0.74* 9.03* -2.47 79
RELM8 RED LODGE 2.78 0.48 1.24* 0.35 0.42 1.78 1.58 2.60 1.91 2.13 1.45 0.65* 17.37 -5.29 77
ROBM8 ROBERTS 1 N 2.24 0.11 0.66 0.21 0.38 1.26 0.46* 1.27 1.36 0.63 0.59 0.64* 9.81 -4.40 69
CARTER COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BTWM8 BELLTOWER 2.91 M 0.66 0.26 0.01 0.51* 1.22* 0.85 1.96* 0.83 0.57 0.69* 10.47 -4.49 70
EKLM8 EKALAKA 3.67* 0.64 0.72* M M M M 0.02* M M M M M M M
NOBM8 KNOBS 4 SW 2.23 0.39 0.78 0.43 0.17 0.30 2.17 1.18 3.08 1.34 1.07 0.51* 13.65* -3.25 81
RIDM8 RIDGEWAY 1 S 3.23 0.63 0.52 0.62 0.04 0.86 1.37 1.22 3.07 2.14 0.57 0.84* 15.11* -0.56 96
CUSTER COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
KMLS MILES CITY AP 2.70 0.11 0.59 0.05 0.50 0.39 1.42 2.10 1.49 1.60 0.88 2.30* 14.13* +1.25 110
MIZM8 MIZPAH 4 NNW 3.24 0.86 0.91 0.19 0.53 0.38 M 2.01 1.29 0.97 M 1.32* 11.70 -2.81 81
POWM8 POWDERVILLE 8 NNE 3.75 0.58 0.75 0.33 0.21 0.44 1.46 0.88 1.43 0.87 0.48 1.03 12.21 -2.81 81
VOLM8 VOLBORG 2.24 0.39 1.12 0.13 0.04 0.38 1.50 0.97 3.49 0.52 0.35 2.35* 13.48* -0.49 96
FALLON COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
KBHK BAKER AP 3.00 0.58 1.07 0.32 0.29 0.18 1.00 1.42 1.54 0.79 0.57 0.97* 11.73* -2.85 80
MAKM8 MAC KENZIE 3.39 0.79 0.84 0.14 0.18 0.20 1.11 0.00* 1.14 0.50 0.46 1.21* 9.96 -4.51 69
PLEM8 PLEVNA 2.95 0.92 1.36 0.37 0.30 0.39 1.62* 0.99 2.43 0.66 0.55 1.20* 13.74 -1.90 88
GOLDEN VALLEY COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
RYTM8 RYEGATE 1.41* 0.09* 1.13* 0.00* 1.21* 0.96* 0.89* 0.37* 1.17* 0.65* 0.96* 1.63 M M M
RYGM8 RYEGATE 18 NW 1.35 0.21 1.40 0.02 1.15 1.30 0.60 0.45 1.93 1.40 0.80 1.75 12.36 -1.92 87
MUSSELSHELL COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
MELM8 MELSTONE 2.55 0.00 1.44 0.00 0.03 0.97 1.27 2.65 2.38 2.40 0.90 2.67* 17.26* +1.79 112
RLAM8 ROUNDUP 15 SW 1.72* 0.03* M M M M M M M M M M M M M
PARK COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
KLVM LIVINGSTON AP 2.53 0.33 0.86* 0.01 0.40 0.53 0.56 4.09 1.25 1.33 1.45 0.59* 13.93 -0.62 96
LVGM8 LIVINGSTON 12 S 2.76 0.51* 0.91 0.06 0.40 0.94 1.40 2.29 2.10 1.68 1.22 0.35 14.62 -1.68 90
SPDM8 SPRINGDALE 2.06* 0.43 0.99 0.03 0.56 0.27 0.98 3.29 1.35 0.63 1.28* 1.10* 12.97 -2.33 85
CYDM8 WILSALL 1 S 1.80 0.40 1.35 T 0.70 1.18 1.20 1.80 3.60 1.40 1.60 1.78* 16.81* +1.92 113
POWDER RIVER COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BIDM8 BIDDLE M M M 0.02* 0.09 0.58 1.01 1.50 1.78 0.70 0.67 0.87* 7.22 -7.53 49
BDDM8 BIDDLE 8 SW 3.25* 0.48 0.37 0.08 0.15 0.59 1.22* 0.97 3.33 1.29 0.87 0.92* 13.52 -1.73 89
4BQ BROADUS 2.70* 0.41* 0.38* T* 0.15 0.82* 0.78* 0.65* 1.70* 1.73* 0.51* 2.26* 12.09 -2.83 81
MORM8 MOORHEAD 9 NE 2.36 0.51 0.55 0.10 0.24 0.70 1.06 2.40 2.71 0.79 0.49 1.45* 13.36* +0.30 102
SONM8 SONNETTE 7 SW M M M M M M M M M M M M M M M
ROSEBUD COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BDBM8 BRANDENBERG 3.31 0.45 1.09 0.08 0.20 0.96 1.27 1.36 2.71 0.75 0.75 2.04 14.97 -0.50 97
COLM8 COLSTRIP 2.41 1.11* 3.90 0.63 1.16* 1.32 0.38 4.89 1.96 0.14* 0.97* 2.45 21.32 +4.92 130
FSYM8 FORSYTH 3.68 0.38 1.24 0.15 0.63 1.33 1.57 2.00 1.83 1.48 1.51 2.38* 18.18* +2.18 114
INEM8 INGOMAR 9 E 2.73 0.18 0.94 T 0.80 0.88 0.85 0.62 1.54 1.03 0.76 3.11* 13.44* -0.11 99
STILLWATER COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
COSM8 COLUMBUS 2.30 0.82 0.78 0.14 0.24 1.52 0.95 1.79 0.96 0.70* M M 10.20 -5.33 66
MOLM8 MOLT 6 SW 1.94* M M M M M M M M M M M M M M
MYSM8 MYSTIC LAKE 3.64 1.36 4.28 0.32 0.82 3.40 1.88 2.50 2.87 2.25 3.45 1.63* 28.40* +1.89 107
SWEET GRASS COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BGTM8 BIG TIMBER 1.67 0.46 1.02 0.01 0.29 0.62* 0.15 1.67* M M M M 5.89 -11.04 35
GBNM8 GIBSON 2 NE M M M M M M M M M M M M M M M
MVEM8 MELVILLE 4 W 1.69 0.55 0.80 0.06 1.19 1.31 0.48 1.49 1.70 1.54 0.80 2.44* 14.05* -5.73 71
TREASURE COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
HYSM8 HYSHAM 3.59 0.38 1.28 0.03 0.51 1.13 1.09 1.51 2.42 1.86 0.88 3.25* 17.93* +3.01 120
HSMM8 HYSHAM 25 SSE 3.54 0.29 0.85 0.03 0.21 0.98 1.70 2.17 2.36 0.70 1.48* 2.81* 17.12 +2.22 115
WHEATLAND COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
3HT HARLOWTON 1.26* 0.06* 0.86 0.05 1.25 1.38 0.35 1.62* 1.35* 2.01 1.06* 2.15 13.40 +0.22 102
HTNM8 HARLOWTON 11 NW 0.98 0.06 0.96 0.60 2.70 1.75 0.63 0.88 1.50 0.78 1.31 2.02* 14.17* -1.82 89
YELLOWSTONE COUNTY MT STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
KBIL BILLINGS INTL AP 1.91 0.58 1.39 0.07 0.36 1.30 0.61 1.94 1.43 1.19 0.87 4.63* 16.28* +2.05 114
BYZ BILLINGS WFO 2.12 0.51* 1.26 0.03 0.20 1.51 0.57 1.89 1.78 0.76 0.82 3.21* 14.66 -0.16 99
BWPM8 BILLINGS WATER PLANT 2.03* 0.50 1.01 0.04* 0.31 1.08* 0.74 1.13 1.57 1.44 0.75* 3.43* 14.03 -1.40 91
SBRM8 HUNTLEY EXPERIMENT STN 2.56 0.37 1.01 0.03 0.49 0.82 0.86 0.92 1.86* 2.14 0.56 3.73* 15.35 +0.91 106
PMPM8 POMPEYS PILLAR 18 N 3.04* 0.26 1.31 0.09 0.77 1.20 1.18 0.86* 1.79 2.96 1.47 3.37 18.30 +3.78 126
SHERIDAN COUNTY WY STATIONS PRECIPITATION (INCHES)
SHEF ID STATION OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP TOTAL DIFF % OF NORMAL
BHRW4 BIG HORN 3.24* 0.13 1.29 0.29 0.12 1.25* 2.45 1.83* 2.52 1.35 0.01* 0.56* 15.04 -3.55 81
BURW4 BURGESS JUNCTION 2.54 0.34 1.39 1.05 0.27 1.47* 2.37 2.98 2.13 2.25 1.01 0.59* 18.39 -5.73 76
CLRW4 CLEARMONT 5 SW 3.15* 0.00* M M M M M M M M M M M M M
DYTW4 DAYTON 2.54 0.17 2.25 0.40 0.41 0.72* 1.70 1.79 2.45 1.00* 0.58* 0.57* 14.58 -3.45 81
LTRW4 LEITER 9 N 3.60 0.59 0.64* 0.24 0.08 0.65* 1.19* 1.09* 2.51 0.04* 0.52* 0.54 11.69 -3.86 75
KSHR SHERIDAN AP 2.56 0.15 1.38 0.33 0.36 1.23 1.86 2.34 1.69 0.39 0.06 0.77* 13.12* -1.81 88
SFSW4 SHERIDAN FIELD STN 3.14 0.18 1.18 0.14 0.10 1.22 M 1.26 1.68* 0.27 M 0.72* 9.89 -3.99 71
IMLW4 SHERIDAN IML 2.60* 0.12 0.90* 0.15* 0.24 0.65* 1.90* 0.77* 4.88* 0.54* 0.01 0.78 13.54 -3.74 78
STOW4 STORY 4.76 0.49 2.76 0.68 0.61 2.20 3.31 2.14 2.85 1.28 0.08* 1.62* 22.78 -4.88 82
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