@weatherwest@mastodon.social my daughter (a fire ranger in NW Ontario) says that most of their fires are started by lightning (there are not many humans around in that part of the world). So a combination of warm and dry and thunderstorms (with lightning and not too much rain) is what produces most of their fires. Of course, in UK and Europe there are a lot more people around and a lot more scope for wildfires to be started by human carelessness.