The ARB Cooperative Observer Network (ARBCON) is comprised of nearly 800 volunteer observers across the state of North Dakota. Observers record daily rainfall and hail occurrences at their locations for the months of April through September of each year. ARBCON reports date back to 1977 and are all available to be viewed or downloaded through the Map and Data Resources web link.
Monthly and Yearly Rainfall Maps -
Maps utilize a "vegetative" color scheme where browns, orange and yellow colors indicate drier conditions and greens and blues indicate progressively wetter conditions. Monthly maps use a common legend, so they can be easily compared to one another. Likewise, total season maps use a similar color scale, but with higher rainfall values to account for summarized precipitation over the growing season. 
30 Year Average Rainfall 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.
Cooperative Observer Data Entry -
Cooperative Observers can log in here to enter their precipitation and hail reports.
ARBCON Locations
ARBCON Reporting Instructions (132 kb) -
ARBCON HALL OF FAME -
The ARB gives special recognition to those observers who have reported rain and hail data for thirty years or more.
ARBCON 30 Year Observers -
The ARB recognizes the 10 observers who have reached their 30-year anniversary reporting rain and hail data. These observers are also the newest members of the ARBCON Hall of Fame.
ARBCON 20 Year Observers -
The ARB recognizes the 9 observers who have reached their 20-year anniversary reporting rain and hail data.
ARBCON 10 Year Observers -
The ARB recognizes the 14 observers who have reached their 10-year anniversary reporting rain and hail data.
Rain Gauge Network Comparison -
Figure 1.
See how the ARB network of volunteer observers stacks up against the National Weather Service Cooperative Observer Network.
Figure 1.
If you are interested in becoming a rain observer in your area, please email the following information to the highlighted link below or call Daniel Brothers at 701-328-2788 or 1-800-654-5981.
Name
Address
Phone Number
Email Daniel Brothers with the above information.
Name
Address
Phone Number
Email Daniel Brothers with the above information.
