Yes, Lord M has been blessed with at least dry weather for mid March meeting! But snow / ice can occur in later months as well- remember the Oulton meeting a few years back which caused a furore when they salted the track? And I remember a 2013 track day at Sillystone (where we were due to test) being cancelled after it snowed all morning......
Oh to be located on the Iberian peninsular where the IHE held their initial race meeting this year on the first w/end in March, and have the last at the end of this month!