The recent record rainfall produced a record mosquito population as of late. Their numbers have increased dramatically over the last few days and this has me thinking of our first frost. When is the average first frost? Statistics compiled by the Illinois State Climatologist indicate that on average we can expect our first frost during the first or second week of October. Our first 32° or lower temperature last year was later, it occurred on October 28th. It’s interesting to note that the standard height for air temperature sensors is around 4 to 5 feet above the ground and on calm and clear nights, the temperature at ground level can be a few degrees colder than reported by most thermometers. So, it is possible to get frost when the air temperature may still indicate that it is above freezing.
We’ll have to wait and see what date our first fall frost will occur. I’m not looking forward to cold temperatures but a brief frost followed by warmer temperatures would make outdoor activities a little more pleasant.