The ARB Cooperative Observer Network (ARBCON) is comprised of nearly 550 volunteer observers across the state of North Dakota. Since 1977, observers have recorded daily rainfall and hail occurrences at their locations for the months of April through September of each year. Starting in October 2010, some observers began snowfall reporting, thus making the network operational on a year-round basis.

Resources

ARBCON reports are all available to be viewed or downloaded through the mapping and data resources on this site.

The Interactive Precipitation Mapping link is a mapping resource for quickly displaying ARBCON data.

The Department of Water Resources Map Services are a variety of internet map servers with various themes. Our general map service uses the Department of Water Resources' vast data resources such as water data locations, drillers’ logs, aquifers, and precipitation info to integrate with spatial data holdings including aerial photography, geo-political boundaries, transportation, and hydrographic features. Our specialized map services are designed for specific data sets. We also have specialized map services related to the data they are designed to deliver such as the LiDAR map service, survey map service, and an aerial imagery map service. Click this link to go directly into the Map Services or click this link to chose presets designed for specific data sets, such as Precipitation Information.

Precipitation Maps allows you to view jpg files of monthly and yearly precipitation maps from 1977 through the present.

30 Year Average Maps - The conclusion of the 2006 growing season completed a 30 year continuous record of precipitation during the growing season in North Dakota. This has led to the completion of average rainfall maps for each month and the growing season as a whole.

Precipitation Download allows you to download data by county, latitude and longitude, or by individual Site ID number.