Frost history / Broken Bow 1 N, OK
Broken Bow 1 N, OK: frost dates by year
Last spring and first fall frost at NOAA station USC00341162, 2009 to 2021, measured from daily minimum temperatures.
Elevation 475 ft, 34.050, -94.738. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 4 | Nov 13 |
| Earliest | Mar 7 (2015) | Oct 12 (2019) |
| Latest | Apr 20 (2021) | Nov 26 (2009) |
| Trend | 10.4 days later per decade | 5.3 days earlier per decade |
| Years with data | 12 | 11 |
At 28°F (hard freeze) the median last spring date is Mar 11 and the median first fall date is Nov 19.
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 |
|---|---|---|---|---|
| 2021 | Apr 20 | no data | Apr 20 | no data |
| 2020 | Apr 15 | Nov 16 | Feb 27 | Nov 30 |
| 2019 | Apr 3 | Oct 12 | Apr 2 | Nov 1 |
| 2018 | Apr 15 | Nov 9 | Mar 7 | Nov 9 |
| 2017 | Mar 15 | no data | Mar 14 | no data |
| 2016 | Mar 21 | Nov 13 | Mar 21 | Nov 19 |
| 2015 | Mar 7 | Nov 22 | Mar 7 | Nov 22 |
| 2014 | Apr 15 | Nov 9 | Mar 5 | Nov 14 |
| 2013 | Mar 28 | Nov 13 | Mar 27 | Nov 13 |
| 2012 | no data | Nov 13 | no data | Nov 24 |
| 2011 | Apr 5 | Oct 20 | Mar 6 | Nov 28 |
| 2010 | Mar 22 | Oct 30 | Mar 3 | Nov 6 |
| 2009 | Apr 7 | Nov 26 | Apr 7 | Dec 4 |
"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.