When Does the First 90-Degree Day Occur? Trends and Heatwaves

Seasonal Temperature Trends

• 🌡️ The normal temperature for today is 89 degrees, with temperatures expected to drop for the rest of the month.
• 🗓️ The average last 90-degree day has been occurring later and later over the past several decades, dating back to the 1970s.
• 📈 The average last 90-degree day is now October 8th, indicating that seeing 90-degree weather late in the season is becoming more common.

Recent Weather Patterns

• ☀️ September has presented a mixed bag of weather, with many days in the 80s but also a significant number of 90-degree days, including a triple-digit heat day early in the month.
• 📈 For the first part of November, temperatures were trending cooler than normal, but are now slightly warmer than normal, with an average of 0.1 degrees above normal.

Regional Heatwave Influence

• 🌐 A heat dome pattern, typically associated with summer, is currently influencing weather across the Great Lakes and Midwest regions, not just North Texas.
• ⚠️ While 90-degree temperatures are not uncommon for North Texas this late in the year, they are less common for areas like Des Moines and Chicago.
• 🏙️ Chicago experienced 83 degrees yesterday, while St. Louis reached 92 degrees, highlighting the extent of this late-season heatwave.