In 1066 Harold Godewinson, the last Anglo Saxon English King of England fought, and won, at Stamford Bridge in Yorkshire against the invading "Vikings" Harald Hardrada and his own brother, Tostig.
While in the North, Harold learnt that Duke William of Normandy had landed on the south coast near Pevensey Bay.
My family and I, here in 2010, were near Cambridge at an Agriculture Show. The day was bright, but a very cold north wind was blowing in off the East Anglian Fens.
It clouded over very quickly at about 1.30 - but the rain held off, and the wind was strong enough to blow the grey clouds away.
There was a brief but beautiful sunset.
I assume the weather was dry back in 1066, for Harold had no trouble marching north in an impressive 3 days, and back again in the same time to London.
Had the weather been wet the roads would have become a quagmire & slowed them down.