We do have some weird ways of predicting weather! In a little village in NC, a wise man uses a brown woolly worm to predict the weather. The black stripes on his nose indicates so many weeks of winter, the brown ones indicates the warmer weather. An older gentleman who was very observant of the weather started the predictions and he was right 86% of the time. Not bad before the days of satellites, etc.

In uk we have st Swithen's day later in the year. If it rains on this day it will rain for the next forty days. As you guessed it nearly always rains.