Weather Program The Jeffers Petroglyphs Historic Site is working on developing programs dealing with the weather and climate of Minnesota. One of our Event Days is about the weather, and we plan to have other programs as well. This is still in development, so more information will be posted as it becomes available. In the meantime, here are some information/activity sheets about weather we've made up for children (and adults, if they wish!). These are in PDF format. Minnesota Average Annual Precipitation Minnesota Average Annual Snowfall Minnesota Normal Mean Annual Temperature Minnesota Normal Mean Spring Temperature Minnesota Normal Mean Summer Temperature Minnesota Normal Mean Autumn Temperature Minnesota Normal Mean Winter Temperature Minnesota USDA Planting Zones U.S. USDA Planting Zones U.S. Heat Zones U.S. Average First Frost Dates U.S. Average Last Frost Dates U.S. Percentage of Sunny Days The Water Cycle The Beaufort Scale Main Page