Ask people – “when do your metal gates begin to rust?” and the majority of the people will answer - after the rain. However, many metal gate owners have seen that the rust begins to appear after a week of the dry and foggy weather. Early November's weather forecast will explain the situation very well – the weather includes the high pressure, fog up to the afternoon, bright and chilly night with no rainfalls, and yet the surface of the metalwork of the gate can remain moist for most of the week.