Overview Realtime Historical Map View
Heat Advisory
2026-07-15T20:00:00-05:00

* WHAT...Heat index values up to 100 expected. * WHERE...In Minnesota, Dodge, Olmsted, Winona, Mower, Fillmore, and Houston Counties. In Iowa, Winneshiek, Allamakee, and Clayton Counties. In Wisconsin, Vernon, Crawford, Richland, and Grant Counties. * WHEN...From noon Tuesday to 8 PM CDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Upper Iowa River At Decorah, Ia Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 494.4
01-02 449.2
01-03 521.25
01-04 489.75
01-05 563.0
01-06 374.0
01-07 427.5
01-08 482.0
01-09 355.0
01-10 330.2
01-11 605.8
01-12 259.67
01-13 355.5
01-14 311.2
01-15 357.5
01-16 296.4
01-17 340.75
01-18 242.0
01-19 257.75
01-20 248.33
01-21 282.0
01-22 241.75
01-23 249.75
01-24 243.0
01-25 205.0
01-26 232.25
01-27 202.0
01-28 132.25
01-29 119.67
01-30 120.25
01-31 129.25
02-01 123.75
02-02 131.0
02-03 129.0
02-04 111.75
02-05 123.0
02-06 149.5
02-07 128.0
02-08 119.0
02-09 112.67
02-10 134.0
02-11 139.0
02-12 132.5
02-13 160.0
02-14 104.33
02-15 132.0
02-16 119.33
02-17 118.67
02-18 118.67
02-19 90.0
02-20 152.67
02-21 290.5
02-22 335.0
02-23 339.5
02-24 263.0
02-25 263.0
02-26 254.67
02-27 258.0
02-28 260.0
02-29 466.0
03-01 829.33
03-02 928.5
03-03 1173.0
03-04 558.4
03-05 462.0
03-06 478.83
03-07 604.86
03-08 642.9
03-09 722.23
03-10 721.39
03-11 780.25
03-12 590.29
03-13 495.68
03-14 419.84
03-15 422.52
03-16 395.96
03-17 427.07
03-18 456.46
03-19 469.51
03-20 635.0
03-21 651.24
03-22 597.07
03-23 620.86
03-24 596.14
03-25 569.67
03-26 513.84
03-27 514.79
03-28 791.36
03-29 681.47
03-30 802.11
03-31 913.92
04-01 854.59
04-02 840.07
04-03 774.87
04-04 847.73
04-05 849.2
04-06 807.53
04-07 725.73
04-08 675.33
04-09 623.5
04-10 743.4
04-11 1021.2
04-12 852.62
04-13 709.29
04-14 705.64
04-15 1112.62
04-16 1150.85
04-17 848.54
04-18 722.58
04-19 699.17
04-20 758.92
04-21 850.79
04-22 943.07
04-23 978.31
04-24 922.86
04-25 843.92
04-26 835.71
04-27 767.79
04-28 723.29
04-29 689.29
04-30 643.08
05-01 774.23
05-02 764.54
05-03 882.62
05-04 1225.31
05-05 1137.33
05-06 1090.93
05-07 964.0
05-08 860.79
05-09 779.67
05-10 795.79
05-11 678.57
05-12 660.64
05-13 748.67
05-14 679.85
05-15 783.31
05-16 822.46
05-17 720.85
05-18 727.0
05-19 780.07
05-20 747.5
05-21 903.8
05-22 1039.53
05-23 760.53
05-24 742.53
05-25 700.93
05-26 680.2
05-27 745.13
05-28 814.47
05-29 823.53
05-30 1074.93
05-31 1095.67
06-01 931.6
06-02 785.21
06-03 843.29
06-04 828.53
06-05 771.64
06-06 708.93
06-07 682.64
06-08 622.93
06-09 657.27
06-10 1348.33
06-11 1237.87
06-12 1006.0
06-13 950.57
06-14 834.14
06-15 737.8
06-16 922.13
06-17 905.0
06-18 800.53
06-19 747.79
06-20 886.93
06-21 853.07
06-22 893.29
06-23 1701.86
06-24 2011.07
06-25 1287.86
06-26 1077.57
06-27 1007.21
06-28 1150.36
06-29 1292.64
06-30 1121.86
07-01 1141.36
07-02 1034.86
07-03 1341.29
07-04 1177.43
07-05 959.53
07-06 910.0
07-07 880.07
07-08 831.36
07-09 791.93
07-10 1179.2
07-11 1219.13
07-12 780.07
07-13 669.71
07-14 597.36
07-15 536.14
07-16 597.31
07-17 538.07
07-18 550.21
07-19 553.29
07-20 571.93
07-21 569.29
07-22 538.21
07-23 547.36
07-24 1124.93
07-25 778.36
07-26 724.86
07-27 628.64
07-28 551.43
07-29 523.21
07-30 546.57
07-31 506.43
08-01 449.0
08-02 463.79
08-03 407.08
08-04 379.62
08-05 427.71
08-06 404.71
08-07 400.23
08-08 388.67
08-09 390.5
08-10 371.17
08-11 354.0
08-12 361.86
08-13 357.21
08-14 335.0
08-15 317.15
08-16 302.0
08-17 308.42
08-18 571.45
08-19 1004.25
08-20 787.31
08-21 693.08
08-22 578.55
08-23 477.15
08-24 390.54
08-25 358.23
08-26 1054.5
08-27 573.46
08-28 637.77
08-29 826.43
08-30 1093.14
08-31 624.46
09-01 582.92
09-02 462.5
09-03 426.17
09-04 461.81
09-05 449.81
09-06 712.18
09-07 532.69
09-08 888.27
09-09 649.74
09-10 959.57
09-11 733.72
09-12 607.65
09-13 576.96
09-14 531.61
09-15 526.89
09-16 533.35
09-17 557.88
09-18 457.89
09-19 451.57
09-20 717.82
09-21 940.47
09-22 849.29
09-23 972.21
09-24 1029.0
09-25 692.85
09-26 556.21
09-27 496.43
09-28 471.85
09-29 438.85
09-30 407.33
10-01 390.33
10-02 413.73
10-03 480.33
10-04 464.53
10-05 505.8
10-06 545.95
10-07 530.18
10-08 519.26
10-09 542.03
10-10 640.95
10-11 664.26
10-12 541.26
10-13 487.92
10-14 456.0
10-15 453.5
10-16 427.69
10-17 411.85
10-18 407.08
10-19 389.67
10-20 375.75
10-21 307.6
10-22 426.25
10-23 416.45
10-24 392.89
10-25 369.43
10-26 329.24
10-27 437.63
10-28 573.63
10-29 433.18
10-30 386.0
10-31 357.15
11-01 354.53
11-02 365.13
11-03 342.96
11-04 321.2
11-05 334.51
11-06 315.89
11-07 321.24
11-08 316.4
11-09 307.9
11-10 299.32
11-11 300.92
11-12 307.74
11-13 308.18
11-14 323.62
11-15 308.58
11-16 295.47
11-17 297.43
11-18 302.95
11-19 286.29
11-20 286.81
11-21 279.68
11-22 296.38
11-23 305.14
11-24 308.76
11-25 305.34
11-26 289.79
11-27 280.92
11-28 280.01
11-29 290.54
11-30 305.29
12-01 284.92
12-02 299.06
12-03 308.29
12-04 301.88
12-05 287.53
12-06 257.28
12-07 281.34
12-08 266.22
12-09 289.45
12-10 277.54
12-11 272.87
12-12 246.22
12-13 229.25
12-14 225.97
12-15 222.04
12-16 252.86
12-17 399.75
12-18 364.38
12-19 320.38
12-20 286.4
12-21 285.2
12-22 348.14
12-23 355.0
12-24 390.8
12-25 335.17
12-26 330.5
12-27 324.33
12-28 662.0
12-29 755.75
12-30 575.8
12-31 547.0

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index