CFAES Give Today
Agronomic Crops Network

Ohio State University Extension


Weather Update: Cranking up the Heat

Ask around and most folks will agree that it has been a peculiar summer when it comes to the weather. Most headlines point out the heat, from Florida to the desert southwest, as the globe just experienced its warmest July on record (1850-2023). For Ohio, we have benefited from numerous cool mornings and comfortable days, but the same northerly wind pattern also brought frequent wildfire smoke filled skies to the region. Overall, temperatures since July 1st are running near to slightly below average (Figure 1-left). Along with the mild temperatures, the latter half of the summer has been considerably wetter than our start, with most areas of Ohio running well above average (Figure 1-right). CoCoRaHS observations over this time include reports of 13-14” in parts of Brown, Clinton, Cuyahoga, and Geauga Counties. On the flip side, dry conditions linger across portions of NW Ohio, where only 4-6” of rain has fallen over this same period in places like Putnam, Paulding, and Allen Counties. For more information, check out the State Climate Office and sign up for our monthly and quarterly climate summaries.

 Figure 1: (Left) Average temperature departure from 1991-2020 normals for the period July 1, - August 20, 2023. (Right) Percent of Normal precipitation for July 1 – August 20, 2023. Figures courtesy of the Midwestern Regional Climate Center.


A major pattern shift has brought strong high pressure to the region and a significant heatwave across the bulk of the central U.S. With Ohio on the eastern edge of this heatwave, temperatures this week will vary greatly from downwind Lake Erie in the northeast to Cincinnati. Highs on Tuesday and Wednesday in the far northeastern counties will remain comfortable in the upper 70s to low 80s, while the southwestern half of the state bakes under 90-95 degree temperatures. There could be a few showers or storms across the northern counties on Tuesday through Thursday. The heat really pushes into Ohio on Thursday, where locations from Cincinnati to Dayton to Columbus could top 100°F. If these locations do hit 100°F, it will be the first time since the summer of 2012. Overnight lows throughout the period will remain in the upper 60s to mid 70s. High temperatures in the 90s will continue into Friday before a strong cold front and a few showers and storms usher in cooler air for the weekend. The current forecast shows 0.10-0.5 inches of rain is expected this week, with slightly heavier amounts in northeast Ohio (Figure 2).  

 Figure 2). Precipitation forecast from the Weather Prediction Center for 8am Monday August 21  – 8am Monday August 28, 2023.

The Climate Prediction Center’s 8-14 Day Outlook and the 16-Day Rainfall Outlook from NOAA/NWS/Ohio River Forecast Center indicate that probabilities for temperatures and precipitation are leaning toward below average for the period of August 29 – September 4, 2023 (Figure 3). For this time of year, the average high-temperature range is 81-85°F, the average low-temperature range is 61-64°F, and the average weekly total precipitation is about 0.70-0.80 inch.

 Figure 3) Climate Prediction Center 8-14 Day Outlook valid for August 29 – September 4, 2023, for left) temperatures and right) 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.