In general I never set out to fly in rain. So that takes out frontal conditions - we are doing it for fun and enjoyment after all. But it does happen, most usually when showers or worse thunderstorms break out when the probability of them was low or before the forecast time. In that case I will try to avoid the worst heaviest showers but accept a light shower in a deteriorating situation to get home before heavier showers/thunderstorms break out, constantly trying to have an alternate in mind.