Chicago experienced record-breaking warm temperatures on Tuesday, with temperatures reaching 83 degrees. However, residents are now bracing themselves for what could be one of the coldest Halloweens on record. While Halloween weather in the city is usually considered cold, it has rarely been as cold or snowy as it might be this year. Only eight Halloweens in Chicago have seen snowfall since recordkeeping began. Despite this, our memories of Halloween weather tend to make it seem colder than it actually is, even if temperatures only drop from 75 to 60 degrees.
In 2019, the city experienced a chilly Halloween with temperatures dropping to 33 degrees and a record-breaking 3.4 inches of snowfall. Looking at historical data, there have been 49 Halloweens with highs in the 50s, 38 in the 60s, 35 in the 40s, and 20 in the 70s. There was only one Halloween when temperatures exceeded 80 degrees. The average high and low temperatures for October 31st are 56 degrees and 41 degrees respectively. However, this year’s forecast is a stark contrast. A low pressure system is expected to move across Minnesota and Wisconsin, bringing temperatures in the 30s, wind gusts of up to 30 mph, and potential snow showers to northeastern Illinois.
According to the current forecast, Halloween in 2023 is set to be the fifth-coldest on record, with a projected high of 38 degrees. Trick-or-treaters will experience a wind chill making it feel like the mid-to-upper 20s. The wind will strengthen in the afternoon and evening as the low-pressure system passes through. There is also a chance of snow showers throughout the day, with more scattered snow showers possible in the afternoon and evening. Although temperatures will be above freezing, “wet” snow that melts on contact may still accumulate on grass, cars, and elevated surfaces, potentially dampening non-water-resistant Halloween costumes. It is advised to plan for staying dry and warm while trick-or-treating and look forward to temperatures in the 50s returning towards the end of the week.