Frost history / Mason City, NE
Mason City, NE: frost dates by year
Last spring and first fall frost at NOAA station USC00255250, 1987 to 2016, measured from daily minimum temperatures.
Elevation 2,292 ft, 41.221, -99.294. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 8 | Sep 28 |
| Earliest | Apr 10 (2003) | Sep 13 (2014) |
| Latest | May 28 (1992) | Oct 22 (2007) |
| Trend | little change (less than half a day per decade) | 3.5 days later per decade |
| Years with data | 27 | 27 |
At 28°F (hard freeze) the median last spring date is Apr 27 and the median first fall date is Oct 10.
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 |
|---|---|---|---|---|
| 2016 | Apr 12 | no data | Apr 12 | no data |
| 2015 | May 21 | Oct 16 | May 12 | Oct 29 |
| 2014 | May 17 | Sep 13 | May 17 | Oct 28 |
| 2013 | May 4 | Oct 8 | Apr 26 | Oct 18 |
| 2012 | no data | Sep 23 | no data | Oct 2 |
| 2009 | May 10 | Sep 29 | Apr 28 | Oct 4 |
| 2008 | May 14 | Oct 14 | Apr 28 | Oct 16 |
| 2007 | Apr 16 | Oct 22 | Apr 15 | Oct 23 |
| 2006 | May 12 | Oct 12 | Apr 26 | Oct 12 |
| 2005 | May 15 | Sep 29 | May 3 | Oct 7 |
| 2004 | May 14 | Oct 2 | May 14 | Oct 14 |
| 2003 | Apr 10 | Sep 19 | Apr 9 | Oct 25 |
| 2002 | May 18 | Sep 27 | Apr 25 | Oct 13 |
| 2001 | Apr 23 | Sep 24 | Apr 18 | Oct 16 |
| 2000 | Apr 22 | Sep 25 | Apr 21 | Oct 6 |
| 1999 | Apr 19 | Sep 21 | Apr 19 | Sep 29 |
| 1998 | May 8 | Oct 7 | Apr 18 | Oct 22 |
| 1997 | May 20 | Oct 14 | May 9 | Oct 25 |
| 1996 | Apr 27 | Sep 28 | Apr 23 | Oct 10 |
| 1995 | May 11 | Sep 22 | Apr 27 | Sep 22 |
| 1994 | May 1 | Oct 9 | Apr 30 | Oct 9 |
| 1993 | May 3 | Sep 15 | May 3 | Oct 9 |
| 1992 | May 28 | Sep 28 | Apr 27 | Oct 9 |
| 1991 | May 6 | Sep 19 | May 6 | Sep 19 |
| 1990 | May 10 | Sep 23 | May 1 | Oct 10 |
| 1989 | May 10 | Sep 14 | May 6 | Sep 23 |
| 1988 | Apr 28 | Oct 4 | Apr 28 | Oct 24 |
| 1987 | Apr 22 | Oct 3 | Apr 10 | Oct 7 |
"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.