PRISM Group, Oregon Climate Service, Oregon State University 20060621 vector digital data Helena, MT Montana State Library The former name of the data set on the NRIS web site was "precip71_00" https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Shapefiles/Precipitation2000.zip These data are estimates of average annual precipitation, in inches, for the climatological period 1971-2000. Parameter-elevation Regressions on Independent Slopes Model (PRISM) derived raster data is the underlying data set from which the data were created. PRISM is an analytical model that uses point data and a digital elevation model (DEM) to generate gridded estimates of annual, monthly and event-based climatic parameters. For further information, the online PRISM homepage can be found at https://www.prism.oregonstate.edu/. The data is available as an ESRI Grid ASCII export file, in latitude/longitude coordinates with a horizontal resolution of 0.00833 degrees, for the entire United States from the Oregon Climate Service web site. The data for Montana is available in Montana State Plane Coordinates, resampled to a resolution of 600 meters, in either GeoTIFF format or as a shapefile with polygons representing 27 precipitation ranges. There are many methods of interpolating precipitation from monitoring stations to grid points. Some provide estimates of acceptable accuracy in flat terrain, but few have been able to adequately explain the extreme, complex variations in precipitation that occur in mountainous regions. Significant progress in this area has been achieved through the development of PRISM (Parameter-elevation Regressions on Independent Slopes Model). PRISM is an analytical model that uses point data and a digital elevation model (DEM) to generate gridded estimates of monthly and annual precipitation (as well as other climatic parameters). PRISM is well suited to regions with mountainous terrain, because it incorporates a conceptual framework that addresses the spatial scale and pattern of orographic precipitation. 1971 2000 Climatological period from which the point observations were taken. Complete -116.178337 -103.611160 49.180943 44.238013 ISO 19115 Topic Category climatologyMeteorologyAtmosphere precipitation rainfall climate Montana, USA None This data is copyright 2004, PRISM Group, Oregon State University, http://www.prismclimate.org. A statement of this copyright must accompany any transfer or display of this data. The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time. Oregon Climate Service at Oregon State University mailing address

Strand Ag Hall 326, Oregon Climate Service, Oregon State University

Corvallis OR 97331-2209 541-737-5710 oregon@oce.orst.edu https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Thumbnails/20060621_606_thumb.jpg Thumbnail image of Montana 1971-2000 Average Annual Precipitation map https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20060621_606_2000_AvgPrecip71to00.gif Montana 1971-2000 Average Annual Precipitation map Point estimates of monthly precipitation originated from the following sources: 1) National Weather Service Cooperative (COOP) stations, 2) Natural Resources Conservation Service (NRCS) SNOTEL, 3) local networks, and 4) statistically in-filled missing monthly data to produce a serially complete station data set, generated by the National Center for Atmospheric Research (NCAR). National Climatic Data Center (NCDC) 2001 Asheville, NC, USA National Climatic Data Center (NCDC) Natural Resources Conservation Service 2001 Portland, OR, USA Natural Resources Conservation Service, Water and Climate Center 1971 2000 ground condition Location and values of known average monthly and annual precipitation Natural Resources Conservation Service, Water and Climate Center Unpublished Material 1971 2000 ground condition Defense Mapping Agency 1985 Washington, DC U.S. Geological Survey 1985 publication date Terrain surface input to PRISM model for estimation of precipitaion between known points. National Center for Atmospheric Research (NCAR) Unpublished material 1971 2000 ground condition Serially in-filled data set in which missing monthly values are replaced with reasonable values generated by a statistical process (kriging). The process used by the Oregon Climate Service to create this data is described at http://wwww.ocs.oregonstate.edu/prism. 2002 The 1971-2000 average annual precipitation data for the United States was downloaded from the Oregon Climate Service web site. This data was clipped to the area of Montana, projected from latitude/longitude coordinates to Montana State Plane Coordinates (and resampled from a resolution of 0.0083 degrees to 600 meters), and the precipitation units were converted from 100ths of a millimeter to inches. The grid data was classified into 27 classes and converted to shapefile format. 20060621 Raster Grid Cell 894 1537 Vector G-polygon 12937 State Plane Coordinate System 2500 45.000000 49.000000 -109.500000 44.250000 600000.000000 0.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Precip1971_2000.dbf FID Shapefile sequence number Shape Feature geometry GRIDCODE Upper limit of average annual precipitation within the polygon, inches. 7 114 Inches Range of average annual precipitation within the polygon, inches. 6-7 7-8 8-9 9-10 10-11 11-12 12-13 13-14 14-16 16-18 18-20 20-22 22-24 24-26 26-28 28-30 30-34 34-38 38-42 42-46 46-50 50-55 55-60 60-70 70-85 85-100 100-114 Each grid cell value in the raster version of the data is the estimated average annual precipitation of the point in the center of the cell, in inches. Montana State Library mailing address

PO Box 201800

Helena MT 59620-1800 406-444-5354 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov geoinfo@mt.gov Downloadable Data The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time. GeoTIFF and ESRI Shape file https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Shapefiles/Precipitation2000.zip 20140124 20130417 20060621 Montana State Library mailing address

PO Box 201800

Helena MT 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 {56375D06-3CBF-4B12-9D7B-B26166024E71}