Summary of Monthly Hydrologic Conditions in New Jersey

Science Center Objects

The U.S. Geological Survey New Jersey Water Science Center’s monthly summary reports and tables of hydrologic conditions for surface and ground water are based on average monthly conditions for the period of record at each index station. Statistical analyses that correlate current conditions with previous climatic extremes are commonly used to develop these averages.

Map of sites used to observe the monthly conditions in New Jersey

Map of the locations for monthly condition observations(Public domain.)

The usefulness of data in assessment of the effects of climate variability or for the analysis of trends depends on the length of the period of record; therefore the USGS typically uses only stations with at least 30-years of record for analysis of hydrologic trends. The monitoring wells have a much shorter period of record; therefore the USGS is using records from wells with at least 20 years of record to provide provisional analyses of groundwater conditions, with the caveat that the data do not represent long-term conditions.

Recent data provided by the USGS in New Jersey -- including stream discharge, water levels, precipitation, and components from water-quality monitors--are preliminary and have not received final approval. Subsequent review may result in significant revisions to the data, and users are cautioned to consider carefully the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences.