Frost history / Petersburg 1E, IL
Petersburg 1E, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00116765, 2015 to 2025, measured from daily minimum temperatures.
Elevation 600 ft, 40.016, -89.834. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 20 | Oct 21 |
| Earliest | Mar 23 (2017) | Oct 5 (2020) |
| Latest | May 9 (2020) | Nov 12 (2016) |
| Trend | 4.5 days later per decade | 1.9 days earlier per decade |
| Years with data | 10 | 10 |
At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 1.
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 9 | Oct 24 | Apr 9 | Nov 2 |
| 2024 | Apr 21 | Oct 16 | Mar 28 | Nov 26 |
| 2023 | Apr 24 | Oct 30 | Mar 30 | Oct 31 |
| 2022 | Apr 20 | Oct 18 | Mar 29 | Oct 18 |
| 2021 | Apr 22 | Nov 2 | Apr 21 | Nov 3 |
| 2020 | May 9 | Oct 5 | Apr 16 | Nov 2 |
| 2019 | Apr 16 | no data | Apr 1 | no data |
| 2018 | Apr 20 | Oct 16 | Apr 17 | Oct 21 |
| 2017 | Mar 23 | Oct 29 | Mar 22 | Oct 29 |
| 2016 | no data | Nov 12 | no data | Nov 12 |
| 2015 | Apr 23 | Oct 10 | Apr 4 | Oct 11 |
"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.