The average temperature for the Lehigh Valley for March 19 is 50 degrees, and it increases to 55 degrees by March 31.
The map to the left shows the 8-14 day forecast (March 26 - April 1). Temperatures are forecast to be below average between now and March 25. Expect high temperatures to be in the low to mid 40's through this period.
Not to mention, with colder than average temperatures comes chances for snow, even in March.
So Spring is delayed this year. Perhaps it will arrive in April!