Overview Realtime Historical Map View
Extreme Heat Warning
2026-07-16T00:00:00-06:00

* WHAT...Extremely hot daytime temperatures combined with warm overnight lows will produce cumulative heat stress. * WHERE...Portions of southeast Montana and north central Wyoming. * WHEN...Until midnight MDT Wednesday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Dangerously hot conditions with temperatures of 98 to 106 today through Wednesday. Overnight lows will remain well above normal providing only limited relief.

Tongue River At Monarch, Wy Historical Data

Historical Data


Streamflow Range


Date Average 2018 2017 2016 2015 2014 2013 2012 2011
02-12 99.0
02-13 95.0
02-14 92.0
02-15 92.0
02-16 99.0
02-17 95.0
02-18 86.0
02-19 82.0
02-20 99.0
02-21 112.0
02-25 108.0
03-02 66.0
03-03 71.0
03-04 71.0
03-05 69.0
03-06 66.0
03-07 71.0
03-08 93.5
03-09 84.0
03-10 99.33
03-11 99.67
03-12 99.67
03-13 94.67
03-14 92.33
03-15 92.33
03-16 108.75
03-17 111.0
03-18 106.6
03-19 104.8
03-20 108.75
03-21 92.8
03-22 103.5
03-23 102.83
03-24 211.86
03-25 181.43
03-26 184.0
03-27 172.0
03-28 163.43
03-29 174.57
03-30 170.0
03-31 187.67
04-01 267.71
04-02 206.57
04-03 143.43
04-04 121.71
04-05 125.14
04-06 141.57
04-07 129.0
04-08 125.86
04-09 148.67
04-10 167.33
04-11 176.5
04-12 175.17
04-13 171.14
04-14 159.14
04-15 161.5
04-16 171.33
04-17 167.83
04-18 174.8
04-19 163.5
04-20 166.5
04-21 153.86
04-22 167.14
04-23 179.67
04-24 199.57
04-25 276.83
04-26 292.57
04-27 313.71
04-28 457.0
04-29 366.43
04-30 314.0
05-01 283.75
05-02 214.71
05-03 213.86
05-04 249.25
05-05 286.5
05-06 332.38
05-07 367.88
05-08 364.43
05-09 445.13
05-10 433.57
05-11 501.75
05-12 497.0
05-13 478.5
05-14 370.14
05-15 526.0
05-16 565.25
05-17 591.38
05-18 654.75
05-19 685.5
05-20 717.63
05-21 1086.13
05-22 1138.5
05-23 1020.5
05-24 968.0
05-25 1231.63
05-26 1217.63
05-27 1150.88
05-28 1006.43
05-29 1304.86
05-30 1265.14
05-31 1357.63
06-01 1207.0
06-02 1190.25
06-03 1198.13
06-04 1185.25
06-05 1103.25
06-06 1093.5
06-07 1124.5
06-08 1158.5
06-09 1126.88
06-10 1115.63
06-11 1035.13
06-12 997.57
06-13 952.43
06-14 911.29
06-15 870.13
06-16 831.75
06-17 846.63
06-18 809.88
06-19 810.43
06-20 784.14
06-21 746.29
06-22 714.14
06-23 696.29
06-24 726.14
06-25 733.57
06-26 684.57
06-27 670.14
06-28 634.71
06-29 601.14
06-30 589.71
07-01 603.71
07-02 552.57
07-03 546.33
07-04 506.17
07-05 427.14
07-06 414.57
07-07 450.17
07-08 415.67
07-09 394.67
07-10 308.86
07-11 302.14
07-12 315.67
07-13 263.71
07-14 256.43
07-15 229.71
07-16 207.0
07-17 195.29
07-18 181.43
07-19 163.71
07-20 158.86
07-21 144.57
07-22 144.57
07-23 132.2
07-24 128.87
07-25 114.73
07-26 110.74
07-27 107.0
07-28 103.57
07-29 97.14
07-30 102.78
07-31 100.57
08-01 96.63
08-02 94.0
08-03 102.17
08-04 120.23
08-05 88.91
08-06 94.86
08-07 92.41
08-08 90.38
08-09 85.58
08-10 91.42
08-11 91.17
08-12 87.7
08-13 84.59
08-14 84.94
08-15 93.67
08-16 92.0
08-17 96.0
08-18 86.0
08-19 83.83
08-20 90.94
08-21 83.22
08-22 80.8
08-23 79.87
08-24 88.22
08-25 78.88
08-26 75.74
08-27 74.53
08-28 71.84
08-29 73.41
08-30 74.19
08-31 73.19
09-01 72.81
09-02 77.96
09-03 75.39
09-04 71.11
09-05 73.97
09-06 79.96
09-07 77.96
09-08 77.67
09-09 77.13
09-10 76.64
09-11 80.82
09-12 87.41
09-13 83.53
09-14 90.13
09-15 102.94
09-16 133.29
09-17 112.29
09-18 103.0
09-19 104.0
09-20 102.86
09-21 101.43
09-22 101.83
09-23 99.86
09-24 102.71
09-25 188.71
09-26 119.71
09-27 113.86
09-28 117.0
09-29 112.71
09-30 118.17
10-01 113.71
10-02 112.14
10-03 109.43
10-04 118.86
10-05 131.14
10-06 119.71
10-07 123.29
10-08 143.57
10-09 135.0
10-10 122.43
10-11 116.1
10-12 120.29
10-13 120.43
10-14 116.86
10-15 124.43
10-16 116.57
10-17 117.57
10-18 128.57
10-19 119.86
10-20 115.86
10-21 119.71
10-22 117.57
10-23 113.03
10-24 113.57
10-25 110.17
10-26 118.0
10-27 112.5
10-28 104.65
10-29 109.14
10-30 116.43
10-31 111.44
11-01 119.0
11-02 138.2
11-03 110.17
11-04 113.33
11-05 106.86
11-06 102.89
11-07 96.97
11-08 95.76
11-09 101.2
11-10 107.17
11-11 110.0
11-12 107.78
11-13 105.28
11-14 107.12
11-15 109.8
11-16 100.85
11-17 105.75
11-18 113.67
11-19 87.08
11-20 91.1
11-21 97.33
11-22 96.33
11-23 120.33
11-24 90.0
11-25 92.0
11-26 94.8
11-27 99.0
11-28 104.5
11-29 89.05
11-30 66.7
12-01 75.5
12-02 84.3
12-03 92.77
12-04 96.65
12-05 207.1
12-06 78.2
12-16 88.2
12-17 92.4
12-18 70.9
12-19 96.7
12-20 108.0
12-21 88.2

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index