After her initial excitement over her summer Montessori work shelf, O(5) quickly lost interest in doing "Montesori school" this summer. However, she does enjoy doing this work.
O's teacher gave me a copy of a thermometer, which I laminated. I have the laminated thermometer, a real thermometer, and a dry erase marker on the shelf. O puts the thermometer outside or inside, and then checks the temperature before filling in the laminated thermometer to match. Simple and fun!