Wiktionary
weatherless
a. Without weather.
Usage examples of "weatherless".
The commander had noticed that most of the buildings here in this now airy but still virtually weatherless space, even the most recently constructed ones, still had roofs, many of them sloped and angled as if to shed nonexistent rain or snow.
In the bottomless space containing the gray bands, an ocean of weatherless air existed, according to instrumental indications.
The larger ones, chondrules fused together by the impact, thus became ore deposits such as are rare on weatherless basaltic Luna.