Frost history / Avon, IL
Avon, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00110356, 2008 to 2025, measured from daily minimum temperatures.
Elevation 640 ft, 40.663, -90.445. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 23 | Oct 9 |
| Earliest | Apr 10 (2010) | Sep 24 (2012) |
| Latest | May 12 (2021) | Nov 1 (2021) |
| Trend | 6.7 days later per decade | 6.2 days later per decade |
| Years with data | 11 | 12 |
At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 27.
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 17 | Oct 24 | Apr 9 | Oct 24 |
| 2024 | Apr 21 | Oct 16 | Apr 6 | Oct 17 |
| 2023 | Apr 27 | Oct 10 | Apr 24 | Oct 30 |
| 2022 | Apr 27 | Oct 8 | Apr 20 | Oct 8 |
| 2021 | May 12 | Nov 1 | Apr 22 | Nov 2 |
| 2020 | May 12 | Oct 5 | May 9 | Oct 28 |
| 2017 | Apr 23 | Oct 28 | Mar 23 | Oct 29 |
| 2015 | May 1 | no data | Apr 23 | no data |
| 2012 | Apr 23 | Sep 24 | Apr 12 | Oct 27 |
| 2011 | no data | Oct 2 | no data | Oct 21 |
| 2010 | Apr 10 | Oct 4 | Mar 27 | Oct 29 |
| 2009 | Apr 16 | Oct 5 | Apr 9 | Oct 10 |
| 2008 | no data | Oct 27 | no data | Oct 28 |
"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.