Frost history / New Boston Dam 17, IL
New Boston Dam 17, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00116080, 1997 to 2025, measured from daily minimum temperatures.
Elevation 548 ft, 41.193, -91.058. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 14 | Oct 25 |
| Earliest | Mar 25 (1998) | Oct 2 (2003) |
| Latest | Jun 2 (2001) | Nov 12 (2024) |
| Trend | little change (less than half a day per decade) | 5.1 days later per decade |
| Years with data | 26 | 28 |
At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 4.
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 10 |
| 2024 | Mar 28 | Nov 12 | Mar 24 | Nov 26 |
| 2023 | Apr 26 | Oct 30 | Mar 22 | Nov 1 |
| 2022 | Apr 20 | Oct 18 | Apr 17 | Oct 19 |
| 2021 | Apr 22 | Nov 3 | Apr 2 | Nov 3 |
| 2020 | May 10 | Oct 26 | Apr 16 | Nov 2 |
| 2019 | Apr 2 | Oct 26 | Apr 2 | Nov 7 |
| 2018 | Apr 21 | Oct 18 | Apr 21 | Oct 21 |
| 2017 | Apr 7 | Oct 29 | Apr 2 | Oct 29 |
| 2016 | Apr 13 | Nov 12 | Apr 10 | Nov 12 |
| 2015 | Apr 12 | Oct 18 | Mar 30 | Nov 8 |
| 2014 | Apr 16 | Nov 1 | Apr 16 | Nov 1 |
| 2013 | Apr 21 | Oct 22 | Apr 4 | Oct 26 |
| 2012 | Apr 13 | Oct 27 | Mar 6 | Oct 29 |
| 2011 | May 5 | Oct 28 | Apr 1 | Oct 29 |
| 2010 | Mar 26 | Oct 29 | Mar 26 | Nov 6 |
| 2009 | Apr 16 | Oct 10 | Mar 15 | Nov 28 |
| 2008 | no data | Oct 21 | no data | Nov 10 |
| 2007 | Apr 16 | Nov 6 | Apr 10 | Nov 7 |
| 2006 | Apr 9 | no data | Mar 27 | no data |
| 2005 | May 16 | Oct 26 | May 4 | Nov 16 |
| 2004 | Apr 14 | Oct 5 | Mar 23 | Oct 17 |
| 2003 | Apr 11 | Oct 2 | Apr 11 | Oct 3 |
| 2002 | no data | Oct 20 | no data | Nov 1 |
| 2001 | Jun 2 | Oct 18 | Mar 29 | Dec 9 |
| 2000 | Apr 13 | Oct 7 | Apr 9 | Nov 15 |
| 1999 | Mar 28 | Oct 18 | Mar 27 | Nov 16 |
| 1998 | Mar 25 | Nov 5 | Mar 25 | Nov 5 |
| 1997 | no data | Oct 18 | no data | Oct 22 |
"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.