They say that you should never knock an “old wives tale”, as they are often rooted in fact (or at least, experience)
I posted earlier about what a wonderful start to March we had had in Colorado, well the Lion turned into a Lamb on Thursday 26th. At 11:30am the temperature was 5°C (41°F) not particularly warm, but not bad for the time of year. By 2:30pm the temperature had plummeted to -12°C (10°F) and over the next 12 hours there was a blizzard that deposited over 8 inches of drifting snow.
The moral? Listen to what your granny says.. she may not be as daft as you think!