We address the question, Given a multifrequency system comprising an RF radar and an IR sensor, what is the probability of good multisensor propagation? We define good multisensor propagation as one in which there is no fog and/or the RF propagation conditions are at the same time superrefractive. In addressing this question, we define good IR propagation as that occurring in the absence of fog, and good RF propagation as the condition in which the propagation is superrefractive. Data were analyzed from 981 radiosondes launched during 1973 and 1974 by the U.S. Air Force at three Iranian coastal locations on and in the vicinity of the Persian Gulf. Statistics were derived which demonstrate that 98% of the time, good multisensor propagation will exist, with 99% likelihood during the summer and 94% during the winter. Ancillary statistics associated with the likelihood of occurrence of the following environmental and propagation features were derived: the potential for fog, good RF propagation, temperature inversions, extreme subrefraction, and ducting.¿ 1997 American Geophysical Union