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NEW JERSEY 24 HOUR RAINFALL FREQUENCY DATA

Chapter 2 Estimating Runoff and Peak Discharges Part 650
Engineering Field Handbook
NJ Supplement

October 2008 - Updated

County 1 year 2 year 5 year 10 year 25 year 50 year 100 year
Atlantic 2.72 3.31 4.30 5.16 6.46 7.61 8.90
Bergen 2.75 3.33 4.26 5.06 6.25 7.29 8.43
Burlington 2.77 3.36 4.34 5.18 6.45 7.56 8.81
Camden 2.73 3.31 4.25 5.06 6.28 7.33 8.51
Cape May 2.68 3.27 4.24 5.08 6.37 7.50 8.77
 Cumberland 2.69 3.27 4.25 5.09 6.37 7.50 8.77
Essex 2.84 3.44 4.40 5.22 6.44 7.50 8.67
Gloucester 2.71 3.29 4.23 5.04 6.27 7.34 8.52
Hudson 2.74 3.31 4.24 5.02 6.18 7.19 8.30
Hunterdon 2.80 3.38 4.26 5.00 6.09 7.02 8.03
Mercer 2.74 3.31 4.23 5.02 6.20 7.21 8.35
Middlesex 2.76 3.35 4.30 5.12 6.36 7.43 8.63
Monmouth 2.79 3.38 4.37 5.23 6.52 7.66 8.93
Morris

2.94

 3.54 4.46 5.23 6.36 7.31 8.35
Ocean 2.81 3.42 4.45 5.33 6.68 7.87 9.20
Passaic 2.87 3.47 4.42 5.24 6.45 7.49 8.64
Salem 2.69 3.26 4.20 5.01 6.23 7.29 8.47
Somerset 2.77 3.34 4.25 5.02 6.17 7.16 8.24
Sussex

2.68

 3.22 4.02 4.70 5.72 6.60 7.58
Union 2.79 3.38 4.34 5.17 6.41 7.48 8.68
Warren 2.78      3.34 4.18 4.89 5.93 6.83 7.82
Notes: The average point rainfall amounts listed above were developed from data contained in NOAA Atlas 14 Volume 2.

Point rainfall estimates for specific locations may be obtained from the Precipitation Frequency Data Server located at http://hdsc.nws.noaa.gov.

For most hydrologic design procedures, the rainfall amounts listed above may be rounded to the nearest tenth of an inch.

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Last Modified: November 18, 2008