A cold start to March is not unusual. At least, not in this neck of
the woods.
The comments on this ng seem to convey rather short memories.
Both March 2005 and 2006 started cold.
4th and 7th March 2005 min -3.0C
2nd March 2006 min -3.7C.

It was coldest at the start of March 1986, with -5.7C on 3rd.

Perhaps we are just longing for this extended winter to end.

Len Wood
Wembury, SW Devon, 83 m asl.