This poster presents data on the spatial variability of below-canopy meteorological conditions within the ridge-ravine landscape of Hoosier National Forest. The study area consists of largely unfragmented deciduous forest with deeply incised ravines. The data were collected as part of an interdisciplinary project to assess the effect of (1) within-year and between-year climatic variation and (2) projected climate change scenarios on the productivity of four abundant Neotropical migrant birds (two understory species: Acadian Flycatcher, Wood Thrush and two ground nesters: Worm-eating Warbler, Ovenbird). Understanding climatic impacts on Neotropical migratory birds is crucial because (1) they are the dominant breeding birds in midwestern forest, (2) they are particularly sensitive to environmental change, and (3) they have become a major concern in issues of biodiversity in North America. Demographic data on the birds, micrometeorological data from several forest contexts and individual nest sites, information on insect abundance, and more general characteristics of landscape pattern were collected for four summers (1994-1997). This paper presents some of the micrometeorological results, focusing on the variability of climatic conditions (specifically temperature, humidity, radiation, and soil moisture) within the ravines and around nest sites. Data were collected with an arrays of sensors located at varying elevations within the ridge and ravine landscape. Transfer functions relating data collected by the National Weather Service network to conditions within the forest also will be presented.