We are once again providing soil temperatures in the C.O.R.N. Newsletter for spring 2019. The Ohio Agricultural Research and Development Center (OARDC) Agricultural Research Stations located throughout the state have two and four inch soil temperatures monitored on an hourly basis.
Figure 1. Average daily air temperature (average of maximum and minimum daily temperatures; red-dashed), two and four inch soil temperatures for spring 2019 (brown and blue-solid, respectively), and two and four inch five-year average soil temperatures (brown and blue-dotted, respectively) for four OARDC stations from around Ohio (Northwest, Wooster, Western, and Piketon; see map insets). Conditions for 2019 are plotted through April 14th.
Figure 1 shows that through the first 10 days of April, warm daily average temperatures of 55-65°F (a few highs near 80°F) had all stations’ soil temperatures running above their five-year averages. Roller-coaster weather conditions since, noted by several days with average air temperatures below 50°F, have curbed or reversed these warming trends from earlier in the month. Three of the four stations currently indicate soil temperatures right at their five-year averages. The exception is Northwest, which has experienced colder air temperatures, where soil temperatures are running below their five-year averages. With similar large swings in temperatures and ample precipitation opportunities expected for the week ahead, we should see soil temperatures respond accordingly, with an overall moderate increase in soil temperatures by April 22nd.
For more complete weather records for all of the OARDC research stations, including temperature, precipitation, growing degree days, and other useful weather observations, please visit http://www.oardc.ohio-state.edu/weather1/.