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 | WY7-Day Snow Depth and SWE Data
AK | AZ | CA | CO | ID | MT | NV | NM | OR | UT | WA | WY
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)
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)
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.
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.
Additional Information
Climatic and Hydrologic Normals
This page reviews the NRCS normals, describes how normals are calculated, and provides access to current and historic normals.
Learn MoreNational Water and Climate Center
The National Water and Climate Center (NWCC) provides technical leadership, maintains unified databases and telemetry systems, and forecasts snowmelt driven water supply in support of the west-wide Snow Survey and Water Supply Forecasting Program (SSWSF).
Learn MoreSoil Climate Analysis Network
The Soil Climate Analysis Network, also known as SCAN, supports natural resource assessments and conservation activities through its comprehensive, nationwide soil moisture and climate information network.
Learn More