Cooler Weather Returns

After a cool start to June, temperatures have been running 4-10°F above average over the last 10 days. The airmass was quite a bit more humid as well, with numerous “gully washers” across the state. Figure 1 shows 2-4 inches of rain fell across many southern counties, with a Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) observer in northern Scioto County reporting 5.23 inches for the week.Figure 1: Multi-sensor observed precipitation for the last seven days ending on June 14, 2021. Figure from the Midwestern Regional Climate Center (

After a couple of cold fronts on Sunday and Monday, another weak cold front will drop south across the state on Tuesday. A widely scattered shower cannot be ruled out. Behind this front, even cooler air will settle in, with overnight lows Wednesday and Thursday expected to reach the mid-40s to low-50s and daytime highs mainly in the 70s with low humidity. Temperatures will warm a bit into the weekend, as the southerly flow will bring a return to more humid conditions and an increased chance of showers and storms. Overall, we are expecting light rain totals this week across the south, with 1-2” across northern Ohio (Fig. 2).Figure 2: Forecast precipitation for the next 7 days. Valid from 8 pm Monday June 14, 2021, through 8 pm Monday June 21, 2021. Figure from the Weather Prediction Center

The latest NOAA/NWS/Climate Prediction Center outlook for the 6-10-day period (June 20 – 24) shows elevated probabilities of below-average temperatures and above-average precipitation (Fig. 3). Normal highs during the period should be 80-85°F, normal lows 60-65°F, with 1.00-1.15 inches of rain per week. The 16-Day Rainfall Outlook from NOAA/NWS/Ohio River Forecast Center also supports above-average precipitation over the next couple of weeks.Figure 3: Climate Prediction Center 6-10 Day Outlook valid for June 20 – 24, 2021 for top) temperatures and bottom) precipitation. Colors represent the probability of below, normal, or above normal conditions.

Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.