I decided to make myself a mini-greenhouse. I found an old metal shelf in the shed we weren't using and set it up on the western side of the house. I thought in this position it would be sheltered enough from the wind and stay warm. But it wasn't temperature stable enough, and the wind was drying out my trays very quickly. So today I covered it with clear table plastic I purchased from Spotlight. I used electrical tape to attach it around the back and sides, then taped a separate piece for a front access flap.
I'm hoping this will improve my seed germination rate significantly. I guess I'll keep you posted as to my degree of success.