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Snow and Climate Monitoring Predefined Reports and Maps

The National Water and Climate Center provides a number of predefined reports, using the online tools it administers for the Snow Survey and Water Supply Forecasting Program.

Snowpack: Snow Water Equivalent (SWE) and Snow Depth

Reports

Update Reports - Current and monthly snowpack, precipitation, reservoir, and streamflow data

Basin Data Report - Select "Snowpack" report type

Daily SWE Report, By SNOTEL Site: Current Water Year | Historic

Monthly SWE Report, By SNOTEL Site: Current Water Year | Historic

Daily Snow Depth and SWE Data
AK | AZ | CA | CO | ID | MT | NV | NM | OR | UT | WA | WY

7-Day Snow Depth and SWE Data
AK | AZ | CA | CO | ID | MT | NV | NM | OR | UT | WA | WY

SNOTEL Site List by State

Maps

Snow Water Equivalent > Percent of 1991-2020 Median > Stations Only | Basins Only | Stations and Basins

Snow Water Equivalent > Percent of 1991-2020 Median > Beginning of Month (SNOTEL and Snow Course) > Stations Only | Basins Only | Stations and Basins

Snow Water Equivalent > Percentile Compared to Period of Record (POR)

Snow Water Equivalent - Records

Snow Depth

Snow Depth - 3-day delta

Snow Depth - 7-day delta

Snow Density

Graphs

Water Year Graph - Current and average; SWE and precipitation


Precipitation

Reports

Update Reports - Current and monthly snowpack, precipitation, reservoir, and streamflow data

Basin Data Report - Select "Precipitation" report type

Daily Precipitation Accumulation, By SNOTEL Site - Current Water Year | Historic

Monthly Precipitation Accumulation, By SNOTEL Site - Historic

Maps

Month-to-Date > Percent of 1991-2020 Median > Stations Only | Basins Only | Stations and Basins

Water Year-to-Date > Percent of 1991-2020 Median > Stations Only | Basins Only | Stations and Basins

Water Year-to-Date > Percentile Compared to Period of Record (POR)

Water Year-to-Date - Records

Graphs

Water Year Graph - Current and average; SWE and precipitation


Temperature

Reports

Daily Minimum, Maximum, Average, By SNOTEL Site - Current Water Year | Historic

Air Temperature Bias Correction

The extended range air temperature sensors used at SNOTEL sites in the continental U.S. calculate temperature from sensor output voltage using a linear least-squares regression algorithm. It has been determined that use of the linear least-squares regression algorithm has resulted in a data bias.

The Snow Survey and Water Supply Forecasting Program is actively working on a correction technique for this issue. 

Read more about the work being done.


Snowpack and Precipitation Index Maps

The Basin Filled GIS Maps are being retired and will no longer be updated or available. The National Water and Climate Center now provides similar information in an updated format by state and content. Links to these new maps can be found on the page Snowpack and Precipitation Index Maps.


1991-2020 Climatic and Hydrologic Normals

The Snow Survey and Water Supply Forecasting (SSWSF) normals are site-specific measures of central tendency (either the median or average) for a data type, such as snow water equivalent (SWE). The statistics are calculated over a 30-year period and updated each decade, in agreement with World Meteorological Organization (WMO) standards. This 30-year reference period was chosen to characterize the current hydroclimatology at each station. The most recent medians and averages have been updated to include data for the water years 1991-2020. The National Water and Climate Center (NWCC) also provides medians and averages for the 1981-2010 and 1971-2000 reference periods for stations with sufficient data.

The normals available from the NWCC include the median and average for SWE, snow depth (snow courses only), precipitation, volumetric streamflow, and reservoir storage. Values are calculated from data collected by NRCS-managed stations and external agencies such as the U.S. Geological Survey (USGS), National Weather Service (NWS), state agencies, and private organizations. Normals are calculated for various durations including daily, month-to-date, semi-monthly, monthly, seasonal, and annual based on the data type.

Learn more about Climatic and Hydrologic Normals.

Retrieve 1991-2020 Normals

Additional Information