Overview Realtime Historical Map View
Heat Advisory
2026-08-06T20:00:00-04:00

* WHAT...Heat index values up to 98 expected. * WHERE...Eastern Hillsborough and Interior Rockingham Counties. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Souhegan River At Merrimack, Nh Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 413.45
01-02 403.1
01-03 397.64
01-04 360.89
01-05 351.6
01-06 356.3
01-07 325.9
01-08 308.4
01-09 287.2
01-10 333.33
01-11 531.2
01-12 483.3
01-13 495.2
01-14 689.44
01-15 616.75
01-16 562.5
01-17 632.43
01-18 501.67
01-19 410.8
01-20 429.75
01-21 332.83
01-22 329.0
01-23 294.0
01-24 305.5
01-25 556.4
01-26 782.0
01-27 1120.2
01-28 985.0
01-29 735.0
01-30 507.37
01-31 426.93
02-01 550.5
02-02 431.34
02-03 371.04
02-04 325.54
02-05 317.98
02-06 337.18
02-07 320.25
02-08 349.29
02-09 317.04
02-10 293.82
02-11 294.04
02-12 385.6
02-13 355.33
02-14 281.66
02-15 317.94
02-16 300.82
02-17 281.3
02-18 348.14
02-19 393.74
02-20 379.56
02-21 330.49
02-22 299.79
02-23 331.93
02-24 388.49
02-25 402.49
02-26 567.73
02-27 486.56
02-28 608.33
02-29 654.25
03-01 483.67
03-02 432.0
03-03 523.22
03-04 500.8
03-05 490.78
03-06 393.82
03-07 482.0
03-08 652.0
03-09 582.1
03-10 541.0
03-11 577.73
03-12 550.09
03-13 542.17
03-14 563.23
03-15 547.38
03-16 565.08
03-17 578.62
03-18 640.85
03-19 524.43
03-20 473.85
03-21 450.43
03-22 429.54
03-23 412.21
03-24 449.14
03-25 478.64
03-26 486.21
03-27 471.31
03-28 471.0
03-29 550.14
03-30 631.2
03-31 735.36
04-01 742.87
04-02 782.27
04-03 714.27
04-04 749.47
04-05 787.93
04-06 756.73
04-07 716.0
04-08 716.13
04-09 767.5
04-10 714.07
04-11 665.5
04-12 618.46
04-13 566.5
04-14 593.71
04-15 587.08
04-16 567.54
04-17 628.85
04-18 592.38
04-19 503.62
04-20 488.85
04-21 457.71
04-22 508.86
04-23 466.79
04-24 597.29
04-25 486.62
04-26 413.36
04-27 506.57
04-28 561.93
04-29 451.64
04-30 423.36
05-01 476.8
05-02 657.0
05-03 549.0
05-04 517.0
05-05 472.43
05-06 645.0
05-07 566.13
05-08 435.36
05-09 399.57
05-10 451.33
05-11 553.64
05-12 425.36
05-13 350.36
05-14 297.08
05-15 263.31
05-16 288.58
05-17 343.57
05-18 348.47
05-19 331.07
05-20 298.79
05-21 278.8
05-22 258.4
05-23 274.07
05-24 328.07
05-25 305.8
05-26 312.2
05-27 360.67
05-28 281.27
05-29 248.76
05-30 239.62
05-31 238.12
06-01 269.85
06-02 234.11
06-03 289.72
06-04 273.96
06-05 232.59
06-06 227.0
06-07 322.91
06-08 332.41
06-09 313.91
06-10 258.37
06-11 219.71
06-12 246.65
06-13 231.91
06-14 215.87
06-15 238.91
06-16 200.75
06-17 175.46
06-18 177.83
06-19 179.4
06-20 166.41
06-21 145.16
06-22 137.53
06-23 128.06
06-24 191.19
06-25 171.69
06-26 163.26
06-27 201.74
06-28 200.89
06-29 270.36
06-30 214.53
07-01 184.74
07-02 205.24
07-03 237.67
07-04 247.41
07-05 230.21
07-06 205.05
07-07 168.24
07-08 144.48
07-09 136.69
07-10 149.65
07-11 177.38
07-12 181.18
07-13 206.25
07-14 171.45
07-15 139.81
07-16 132.25
07-17 199.32
07-18 139.46
07-19 218.13
07-20 180.49
07-21 137.3
07-22 122.15
07-23 109.46
07-24 138.11
07-25 121.77
07-26 103.1
07-27 98.03
07-28 92.31
07-29 90.14
07-30 99.35
07-31 212.1
08-01 157.32
08-02 113.68
08-03 103.08
08-04 125.04
08-05 128.83
08-06 88.94
08-07 74.46
08-08 71.92
08-09 68.87
08-10 78.2
08-11 86.06
08-12 83.64
08-13 140.02
08-14 115.06
08-15 155.83
08-16 128.86
08-17 119.07
08-18 126.16
08-19 120.72
08-20 118.42
08-21 126.68
08-22 98.67
08-23 123.26
08-24 164.29
08-25 225.15
08-26 143.55
08-27 131.71
08-28 107.92
08-29 175.82
08-30 166.49
08-31 135.24
09-01 107.21
09-02 89.98
09-03 190.84
09-04 123.24
09-05 100.06
09-06 84.81
09-07 89.29
09-08 146.85
09-09 172.17
09-10 149.06
09-11 130.49
09-12 151.51
09-13 163.64
09-14 152.56
09-15 119.73
09-16 102.34
09-17 96.01
09-18 86.36
09-19 281.43
09-20 207.41
09-21 146.59
09-22 124.35
09-23 119.83
09-24 109.24
09-25 132.58
09-26 153.93
09-27 149.61
09-28 134.42
09-29 115.01
09-30 172.86
10-01 235.08
10-02 152.06
10-03 129.55
10-04 100.17
10-05 210.9
10-06 204.62
10-07 164.6
10-08 144.81
10-09 142.5
10-10 125.72
10-11 112.73
10-12 118.31
10-13 121.97
10-14 112.56
10-15 129.57
10-16 123.78
10-17 136.53
10-18 178.42
10-19 154.1
10-20 122.84
10-21 178.03
10-22 173.25
10-23 157.85
10-24 246.5
10-25 218.14
10-26 187.56
10-27 252.26
10-28 237.89
10-29 278.83
10-30 296.06
10-31 362.54
11-01 518.07
11-02 421.48
11-03 419.59
11-04 445.43
11-05 343.21
11-06 303.68
11-07 310.98
11-08 277.29
11-09 239.6
11-10 244.41
11-11 259.03
11-12 288.75
11-13 355.95
11-14 373.78
11-15 305.78
11-16 261.18
11-17 262.33
11-18 260.65
11-19 253.52
11-20 233.75
11-21 227.23
11-22 213.47
11-23 215.52
11-24 278.2
11-25 285.33
11-26 264.21
11-27 274.6
11-28 383.05
11-29 299.35
11-30 265.69
12-01 356.29
12-02 403.79
12-03 392.6
12-04 397.58
12-05 365.73
12-06 357.13
12-07 337.83
12-08 351.75
12-09 470.12
12-10 384.65
12-11 517.41
12-12 568.52
12-13 450.14
12-14 435.23
12-15 514.85
12-16 450.11
12-17 394.07
12-18 414.17
12-19 669.52
12-20 615.82
12-21 535.1
12-22 549.18
12-23 586.55
12-24 777.6
12-25 732.1
12-26 877.0
12-27 682.5
12-28 562.34
12-29 638.88
12-30 483.33
12-31 446.92

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index