Soil and air temperature, soil moisture, rainfall, and humidity were monitored after prescribed burning on a harvested, mature jack pine stand and on an adjacent, unburned and uncut forest in northeastern Minnesota. Greater temperature and humidity extremes and lower rainfall interception occurred on the burned area. Some differences between burned and unburned areas persisted for more than 17 postfire years. Early postfire herbaceous growth, later shrub development, and emergence of a sapling-sized jack pine and aspen forest all were associated with definite changes in postfire climatic conditions. Forest Sci. 27:33-39.