Frost history / Chicago Northerly Is, IL
Chicago Northerly Is, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00111550, 2005 to 2025, measured from daily minimum temperatures.
Elevation 583 ft, 41.856, -87.609. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 7 | Nov 12 |
| Earliest | Mar 10 (2012) | Oct 12 (2006) |
| Latest | Apr 20 (2013) | Dec 3 (2009) |
| Trend | 5.1 days later per decade | 0.9 days earlier per decade |
| Years with data | 17 | 20 |
At 28°F (hard freeze) the median last spring date is Mar 22 and the median first fall date is Nov 18.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2025 | Apr 8 | Nov 9 | Mar 6 | Nov 9 |
| 2024 | Mar 28 | Nov 21 | Mar 18 | Nov 26 |
| 2022 | Apr 9 | Nov 13 | Mar 29 | Nov 18 |
| 2021 | no data | Nov 15 | no data | Nov 22 |
| 2020 | Apr 16 | Nov 2 | Apr 15 | Dec 1 |
| 2019 | no data | Oct 31 | no data | Oct 31 |
| 2018 | Apr 17 | Oct 21 | Apr 16 | Nov 9 |
| 2017 | Mar 23 | Nov 9 | Mar 22 | Nov 9 |
| 2016 | Apr 9 | Nov 19 | Apr 9 | Nov 20 |
| 2015 | Mar 29 | Nov 20 | Mar 29 | Nov 21 |
| 2014 | Apr 16 | Oct 30 | Apr 15 | Nov 12 |
| 2013 | Apr 20 | Nov 11 | Mar 22 | Nov 12 |
| 2012 | Mar 10 | Nov 12 | Mar 5 | Nov 13 |
| 2011 | Mar 29 | Nov 17 | Mar 2 | Dec 9 |
| 2010 | Mar 26 | Nov 23 | Feb 26 | Nov 25 |
| 2009 | Apr 7 | Dec 3 | Mar 13 | Dec 4 |
| 2008 | Mar 29 | Nov 10 | Mar 22 | Nov 18 |
| 2007 | Apr 8 | Nov 16 | Apr 7 | Nov 23 |
| 2006 | Mar 24 | Oct 12 | Mar 22 | Nov 3 |
| 2005 | no data | Nov 16 | no data | Nov 16 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.