24th August Following on from St. Swithin’s 40 days earlier, St. Bartholomew’s day sets the weather for the 40 days to come. St Bartholomew’s Day also traditionally marked the deadline for gathering early honey and elderberries, before the cooler, damper weather of autumn arrived.
“If the dew is on the blackberry on Bartlemy’s Day, the frost will not come until October.” If dew is present on the blackberries on this late-summer marker day, it signals mild, humid atmospheric conditions that typically delay the first ground frosts.