Why Do We Have Winter? - Another Question from My Daughters

Yesterday afternoon I was playing outside in the snow with my five-year-old daughter when she asked, "why do we have winter?" She didn't ask in a complaining way (she loves playing the snow), but in a genuinely curious way. My short answer was that where we live on Earth is tilted away from the sun for part of the year and that's what makes it colder. She said, "okay, thanks Dad." When she's a little older I might show her the SciShow Kids and Crash Course Kids videos about seasons. 

Why do we have seasons? What causes the changes in weather patterns throughout the seasons? The answers to those questions and more are found in the following SciShow Kids video and Crash Course Kids video.