For example, from Aug 20-25, 2023, Columbia Regional Airport observed six consecutive days with minimum temperatures ≥75☏.

The consecutive string of hot temperatures, especially high minimum temperatures, combined with unusually high dew points was exceptional. The event was stressful for people, pets, livestock and various plants exposed to highly uncomfortable outdoor conditions, including indoor structures without air conditioning. In addition to the drought, another extreme event during the summer of 2023 was a 6-day heat wave from August 20-25. *Rain gauges are from the NWS Cooperative Network or CoCoRaHS Observers. Missouri High and Low Rainfall Extremes for August 2023* Stock water supplies were 5% very short, 26% short, 69% adequate and 0% excellent. Hay and other roughages were 41% very short, 33% short, 26% adequate and 0% surplus. Pastures were rated at 20% good and 0% excellent compared to 30% good and 2% excellent last year. Soybean was reported 49% in good to excellent condition compared to 54% last year. Corn was reported 41% in good to excellent condition compared to 52% last year. Subsoil moisture supplies were reported 48% adequate and 3% in surplus condition compared to 35% of the state reporting subsoil moisture supplies short and 14% very short. Hydrological impacts were also reported in the form of diminished water supplies above and below the ground.Īccording to the Missouri Agricultural Statistics Service report for the week ending August 27, 2023, 59% of the state reported topsoil moisture supplies in adequate condition with 3% surplus, whereas 31% of Missouri reported short topsoil moisture supply and 7% very short. Most impacts have been agriculture related, with reports of crop, pasture, and livestock losses. Drought has impacted much of the Show Me state during the growing season and significant deficits have accumulated, Figure 12. Drought Monitor, for the last week of August, showed drought in much of Missouri despite the wetter than average conditions for the month, Figure 11. Some of the lightest and heaviest August rain gauge reports are listed in Table 1. Drier conditions occurred over a small portion of west central and far south central sections. Radar-estimates for the month indicate heaviest rainfall across the northeastern half of the state and a small portion of southwestern Missouri, Figure 10. Typical of the summer season, August rainfall was highly variable, ranging from less than 1-inch to more than 18-inches, according to rain gauge observations. Most of the rain occurred during the first half of the month. The month tied with 1902 for being the 6th wettest August on record, and it was the first wetter than average month since March, Figure 9. This phenomenon is primarily due to above average summer dew point temperatures in Missouri, Figure 7, which act to suppress maximum air temperature and elevate minimum air temperature.Ībove average rainfall impacted Missouri in August with preliminary data indicating a statewide average of 6.30 inches, 2.59 inches above the long-term average. Summer weather patterns over the past several decades indicate less variance in maximum temperature trends, Figure 5, whereas minimum summer temperatures indicate notable warming, Figure 6. It was the 4th consecutive hotter than average summer. The statewide average summer temperature was 76.1☏, 0.6° above the long-term average. Preliminary mean summer temperature data (Jun-Jul-Aug) indicate above normal conditions this year, Figure 4. Every month this year has been warmer than average, Figure 3. Seasonably cool conditions prevailed the rest of the month. The most notable feature during the month was an intense 6-day heat wave that impacted the state from August 20-25, Figure 2. Slightly above average daily August temperatures impacted Missouri with preliminary data indicating a statewide average temperature of 76.5☏, or 0.5° above the long-term average, Figure 1. MU Extension Associate Professor Emeritus August 2023 Weather and Its Impacts on Missouri Dr.

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