If you had to estimate time spent outside in the winter vs the summer (or fall/spring), how do the seasons compare?

We live where it is cold more than it is warm, so getting outside is harder. LO1 goes outside for 20 minutes a day at school, and then both girls will go out occasionally to play in the snow. But it's not even close to as much as it is in the warmer months. Some days it's not at all. The other day though it was in the upper 50's and they spent almost 3 hours outside. When it warms up we will be out daily, and in the summer a good portion of the day.