CoCoRaHS, the Community Collaborative Rain, Hail and Snow network is a national, non-profit organization of backyard weather reporters who share precipitation data.  Anyone with enthusiasm for the project is welcome to join.  Support and training is offered, and the group emphasizes use of low-cost, simple measuring devices.

CoCoRaHS data is used by The National Weather Service and meteorologists all over the world.  For more details visit: cocorahs.org/.