Standards have been established for meteorological measurements at Long-Term Ecological Research (LTER) Sites. The LTER program is designed to allow for coherence in research over the long term and to recognize that many parts of ecosystems operate over a long time scale and show directionality and periodicity in ecosystems. The following LTER sites are funded in 5-year renewable funding periods and overseen by a central coordinating committee, consisting of the principal investigators for all sites, that supplies normal National Science Foundation peer review procedures: H. J. Andrews Experimental Forest, Oreg.; Cedar Creek Natural History Area, Minn.; Central Plains Experimental Range, Colo.; Coweeta Hydrological Laboratory, N.C.; Illinois and Mississippi Rivers, Ill.; Jornada Experimental Range, N. Mex.; Konza Prairie, Kans.; Niwot Ridge/Green Lakes Valley, Colo.; North Inlet, S.C.; Northern Lakes, Wis.; Okefenokee Natural Wildlife Refuge, Ga.