Question-and-Answer Resource for the Building Energy Modeling Community
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According to Energyplus Engineering Reference (http://bigladdersoftware.com/epx/docs/8-3/engineering-reference/outside-surface-heat-balance.html#outdoorexterior-convection):
Note that when the outside environment indicates that it is raining, the exterior surfaces (exposed to wind) are assumed to be wet. The convection coefficient is set to a very high number (1000) and the outside temperature used for the surface will be the wet-bulb temperature. (If you choose to report this variable, you will see 1000 as its value.)
It seems that you have rain data included in your weather file.
