Autumn may officially begin on September 22 or 23 each year, but it often feels like the weather takes a few weeks to get the memo.
Here at TIME Labs, we were curious when it begins to actually feel like fall around the country. To do so, we looked at 21 years of data from the National Oceanic and Atmospheric Administration, defining autumn as the first five consecutive days in which the high was lower than 70 percent of a region’s yearly range in temperatures. (For example, a place with yearly lows of 10 and yearly highs of 90 would have a “fall line” of 66 degrees, which is 70 percent of the distance between those extremes.) Enter your city or county below to see when you can expect cooler weather in your neighborhood.
