Overview Realtime Historical Map View
Heat Advisory
2026-07-15T20:00:00-04:00

* WHAT...Heat index values up to 105 expected. * WHERE...Berks, Lehigh, Northampton, Eastern Chester, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...From 10 AM to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Lehigh River At Walnutport, Pa 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 2636.82
01-02 2704.0
01-03 2766.36
01-04 2467.0
01-05 2342.0
01-06 2277.78
01-07 2106.67
01-08 1927.4
01-09 1839.9
01-10 3096.09
01-11 3067.27
01-12 3879.0
01-13 3147.0
01-14 3138.18
01-15 3134.18
01-16 2957.8
01-17 2613.64
01-18 2015.3
01-19 2005.0
01-20 1978.27
01-21 2134.0
01-22 1826.25
01-23 1895.71
01-24 2718.75
01-25 3609.78
01-26 3658.25
01-27 3768.57
01-28 3468.75
01-29 3127.78
01-30 2861.11
01-31 2553.33
02-01 2960.0
02-02 2633.75
02-03 2286.25
02-04 2470.0
02-05 2540.0
02-06 2130.11
02-07 2099.4
02-08 1898.75
02-09 1902.91
02-10 1833.4
02-11 1813.3
02-12 1905.5
02-13 2066.1
02-14 1917.1
02-15 1702.0
02-16 1774.0
02-17 2814.44
02-18 2464.44
02-19 2164.0
02-20 2020.0
02-21 1991.0
02-22 1989.0
02-23 1970.5
02-24 2037.9
02-25 2664.44
02-26 2355.0
02-27 2500.73
02-28 2461.82
02-29 3000.0
03-01 2411.82
03-02 2477.27
03-03 2612.73
03-04 2355.18
03-05 2257.83
03-06 2735.0
03-07 2597.5
03-08 2496.67
03-09 2328.33
03-10 2471.54
03-11 2395.38
03-12 2362.31
03-13 3168.46
03-14 2543.07
03-15 2538.57
03-16 2392.14
03-17 2600.71
03-18 2403.57
03-19 2529.87
03-20 2326.0
03-21 2121.73
03-22 2451.14
03-23 2415.53
03-24 2456.2
03-25 2465.6
03-26 2356.8
03-27 2066.6
03-28 2049.53
03-29 2185.93
03-30 2168.2
03-31 2421.14
04-01 2346.07
04-02 2313.27
04-03 2518.13
04-04 3077.67
04-05 3122.13
04-06 2822.73
04-07 2598.27
04-08 3091.73
04-09 2752.4
04-10 2534.4
04-11 2277.07
04-12 2069.57
04-13 2006.14
04-14 2640.14
04-15 2266.15
04-16 2809.69
04-17 2795.85
04-18 2492.0
04-19 2200.0
04-20 2294.31
04-21 2191.43
04-22 2209.0
04-23 2222.14
04-24 2105.71
04-25 1856.14
04-26 1885.0
04-27 2033.21
04-28 1789.86
04-29 1690.64
04-30 1852.14
05-01 3461.4
05-02 3206.07
05-03 2917.43
05-04 2558.0
05-05 2425.33
05-06 2663.33
05-07 2742.0
05-08 3012.67
05-09 2663.33
05-10 2962.67
05-11 2555.33
05-12 2372.87
05-13 2218.93
05-14 2562.93
05-15 2307.86
05-16 2448.14
05-17 3112.86
05-18 3239.73
05-19 2747.13
05-20 2435.57
05-21 2421.6
05-22 2179.27
05-23 2186.67
05-24 2441.47
05-25 2262.8
05-26 1909.07
05-27 1947.6
05-28 1793.0
05-29 1797.47
05-30 1976.93
05-31 1988.8
06-01 1954.87
06-02 1869.67
06-03 2007.8
06-04 1771.07
06-05 1630.07
06-06 1638.21
06-07 1575.0
06-08 1558.07
06-09 1501.2
06-10 1534.0
06-11 1517.87
06-12 2153.79
06-13 2087.21
06-14 1882.36
06-15 1921.14
06-16 1675.93
06-17 1573.27
06-18 1481.67
06-19 1510.57
06-20 1585.36
06-21 1443.43
06-22 1546.86
06-23 1390.0
06-24 1490.71
06-25 1458.14
06-26 1284.21
06-27 1215.93
06-28 1425.5
06-29 1499.14
06-30 1327.0
07-01 1814.0
07-02 1953.93
07-03 1872.79
07-04 1667.93
07-05 1437.67
07-06 1286.8
07-07 1367.29
07-08 1473.71
07-09 1446.43
07-10 1646.53
07-11 1683.13
07-12 1398.93
07-13 1247.73
07-14 1134.8
07-15 1176.21
07-16 1490.57
07-17 1283.79
07-18 1279.07
07-19 1164.43
07-20 1057.0
07-21 1080.29
07-22 1079.43
07-23 1195.64
07-24 1587.79
07-25 1927.57
07-26 1970.07
07-27 1767.21
07-28 1755.57
07-29 1593.5
07-30 1459.21
07-31 1164.0
08-01 1100.08
08-02 1168.14
08-03 1436.64
08-04 1459.79
08-05 2014.36
08-06 1337.36
08-07 1481.36
08-08 1652.85
08-09 1217.62
08-10 1326.92
08-11 1240.43
08-12 1256.14
08-13 1233.79
08-14 1921.79
08-15 1770.36
08-16 1811.38
08-17 1648.85
08-18 1402.58
08-19 1396.38
08-20 1212.54
08-21 1176.54
08-22 1248.33
08-23 1742.0
08-24 2180.15
08-25 1967.85
08-26 1835.57
08-27 1920.57
08-28 1678.64
08-29 1790.86
08-30 1535.79
08-31 1936.64
09-01 2017.29
09-02 4424.5
09-03 1676.21
09-04 1810.43
09-05 1819.07
09-06 2054.0
09-07 2226.71
09-08 2112.43
09-09 2559.07
09-10 2005.79
09-11 2196.21
09-12 2189.43
09-13 2033.5
09-14 1769.21
09-15 1583.86
09-16 1460.07
09-17 1183.93
09-18 1109.07
09-19 2396.14
09-20 1661.0
09-21 1586.79
09-22 1459.23
09-23 1221.86
09-24 2097.71
09-25 1610.5
09-26 1713.36
09-27 1660.79
09-28 1469.93
09-29 1811.29
09-30 1980.46
10-01 1637.69
10-02 1453.54
10-03 1410.08
10-04 1218.0
10-05 1726.36
10-06 1663.29
10-07 1554.5
10-08 1676.36
10-09 1627.62
10-10 1337.57
10-11 1226.36
10-12 1707.93
10-13 1563.36
10-14 1432.07
10-15 1428.38
10-16 1296.5
10-17 1526.29
10-18 1454.43
10-19 1248.86
10-20 1480.93
10-21 1359.0
10-22 1205.43
10-23 1227.79
10-24 1138.79
10-25 1051.29
10-26 978.79
10-27 1061.0
10-28 1274.57
10-29 1295.14
10-30 1786.79
10-31 2115.07
11-01 2489.29
11-02 2201.5
11-03 2148.29
11-04 1889.86
11-05 1457.08
11-06 1524.69
11-07 1554.08
11-08 1413.77
11-09 1289.15
11-10 1357.54
11-11 1250.85
11-12 1331.31
11-13 1603.77
11-14 1673.43
11-15 1622.86
11-16 1584.86
11-17 1498.57
11-18 1384.62
11-19 1281.85
11-20 1193.31
11-21 1218.79
11-22 1185.08
11-23 1332.14
11-24 1774.08
11-25 1878.15
11-26 1755.0
11-27 2047.64
11-28 1994.21
11-29 1845.0
11-30 1985.71
12-01 2113.93
12-02 1988.21
12-03 1890.5
12-04 1746.79
12-05 1656.79
12-06 1607.23
12-07 1671.21
12-08 1986.93
12-09 1987.86
12-10 1856.23
12-11 1961.23
12-12 2071.62
12-13 1727.15
12-14 1665.25
12-15 1677.82
12-16 1682.6
12-17 1955.6
12-18 2343.9
12-19 3008.4
12-20 2621.09
12-21 2491.92
12-22 3143.62
12-23 2670.0
12-24 3116.08
12-25 3846.38
12-26 3473.77
12-27 3416.17
12-28 3574.0
12-29 3700.27
12-30 3525.33
12-31 2854.08

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index