Sunny days, cool nights

We have had a long stretch of temperatures in the 40's or 50's during the day and near or below freezing at night. I left the plastic covers over the garden for most of the week, but will leave them off this week as there are currently no freeze warnings. I covered the asparagus with chicken wire to discourage squirrels from digging around them. The lettuce looks like it may be ready to begin harvesting in a couple of weeks.