Has there been more than one day above 70 this year? Maybe, cannot remember. 1990 had 4 days in the 80's before St Pats day.
Edit-just checked. 2 days so far but MDT is only at 66 as of 3 PM. So I looked at one year, 1990....it had 5 days above 70 before St Pats day (and St Pats day was in the 70's as well). So, not such a rare feat. Only one day in March, March 1, does not feature record high temps in the 70's. 17 out of the 31 March days have records 80 and over.