15 July, a Church festival commemorating St Swithin and popularly believed to be a day on which, if it rains, it will continue raining for the next forty days.
圣斯威森日（7月15日，纪念圣斯威森的教会节日，普遍认为如当天下雨，未来40天将会连续下雨）
Example sentencesExamples
St. Swithin's Day has rather justified the reputation of its weather forecast this year, and now everybody is looking forward anxiously to the fortieth day in the hope that new conditions of weather will result.
Saturday was St Swithin's day and even the weather men were speaking gloomily of the likelihood of it raining, and going on to rain for forty days, just like the legend has it.