TOUGH TO TURN THE CORNER...
The average date of the first 70 degree temperature in Cedar Rapids is March 31st. Its already come and gone. Even worse, the chances of any consistent warmth look small the next 2 weeks (perhaps even 3 weeks) over most of my area. I'll give you 3 reasons why in the form of teleconnections.
First there is the EPO (eastern Pacific Oscillation). It's forecast by the EURO to be largely negative through April 23rd.
The negative EPO phase teleconnects to below normal temperatures in April.
Second is the AO (Arctic Oscillation). It is also forecast to spend the next 3 weeks in a negative phase.