What's Happening Underground? Data Sheet What do you suppose will happen to underground temperatures in your tulip garden this winter and spring? On the same day each month at the same time of day, measure the outside air temperature above your garden (or find out the day's average temperature from the newspaper). Put this in the "air temperature" column below. Next, write your prediction of the soil temperature in your garden on that day. Use a soil thermometer to find out the actual soil temperature and write it on the chart. Air and Soil Temperatures January - June Month (write in date) Air Temperature Soil Temperature Soil Temperature Actual Predicted Actual January ___       February ___       March ___       April ___       May ___       June ___