If you are looking for engaging EE activities in the winter, the bird feeder project and an opportunity to learn about trees could be good choices!
Firstly, I would like to share with you 14 DIY bird feeder arts and crafts that will be sure to attract plenty of feathered friends for classroom excitement and observations. When children take responsibility for a bird feeder, it can help educate them about the wildlife in their community and foster an early appreciation for nature. https://www.plt.org/educator-tips/bird-feeder-projects-natural-recycled-...
In addition, winter is the perfect season to guide children about the basic biology of trees to better understand the changes that happen to trees during cold weather. Project Learning Tree (PLT) has several great activities to help children learn how trees change and adapt to the seasons. https://www.plt.org/educator-tips/how-trees-survive-cold-winters/