Frost history / Ephraim 1NE-Wwtp, WI
Ephraim 1NE-Wwtp, WI: frost dates by year
Last spring and first fall frost at NOAA station USC00472626, 2008 to 2024, measured from daily minimum temperatures.
Elevation 733 ft, 45.171, -87.154. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 15 | Oct 19 |
| Earliest | Apr 26 (2024) | Sep 19 (2020) |
| Latest | May 31 (2009) | Nov 8 (2015) |
| Trend | 6.7 days earlier per decade | 4.0 days earlier per decade |
| Years with data | 16 | 16 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 29.
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 |
|---|---|---|---|---|
| 2024 | Apr 26 | no data | Apr 26 | no data |
| 2023 | May 26 | Oct 9 | May 1 | Oct 31 |
| 2022 | May 5 | Oct 8 | Apr 28 | Oct 19 |
| 2021 | May 12 | Oct 24 | May 12 | Nov 10 |
| 2020 | May 13 | Sep 19 | May 13 | Oct 16 |
| 2019 | May 12 | Oct 20 | May 4 | Nov 6 |
| 2018 | May 21 | Oct 18 | May 11 | Oct 18 |
| 2017 | May 9 | Oct 26 | May 9 | Oct 26 |
| 2016 | May 18 | Oct 14 | Apr 23 | Nov 12 |
| 2015 | May 22 | Nov 8 | May 20 | Nov 8 |
| 2014 | May 17 | Oct 19 | May 5 | Oct 19 |
| 2013 | May 25 | Oct 29 | May 11 | Oct 29 |
| 2012 | Apr 29 | Oct 11 | Apr 29 | Oct 11 |
| 2011 | May 17 | Oct 28 | May 4 | Oct 28 |
| 2010 | May 10 | Nov 1 | May 10 | Nov 1 |
| 2009 | May 31 | Oct 1 | Apr 23 | Nov 6 |
| 2008 | no data | Oct 4 | 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.