The weather in February was to cold to leave plants out overnight. In the early morning the temperature can drop down to the high 30'sF/low 40'sF.
Depending upon the weather, I have been either leaving the plants outside during the day or putting them on a window sill facing the sun when it is cold.
I am hoping that the weather warms up enough that I can transplant the plants soon. Last year, I was able to start transplanting in mid March (see this blog entry)