Frost history / Lamoni, IA
Lamoni, IA: frost dates by year
Last spring and first fall frost at NOAA station USW00014993, 1951 to 2024, measured from daily minimum temperatures.
Elevation 1,168 ft, 40.650, -94.000. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 28 | Oct 15 |
| Earliest | Apr 7 (1955) | Sep 28 (1951) |
| Latest | May 15 (1959) | Nov 7 (1956) |
| Trend | 0.6 days earlier per decade | little change (less than half a day per decade) |
| Years with data | 12 | 12 |
At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 26.
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 21 | Oct 16 | Mar 27 | Nov 21 |
| 1961 | May 2 | Sep 28 | Apr 18 | Oct 20 |
| 1960 | May 1 | Oct 19 | Apr 10 | Oct 19 |
| 1959 | May 15 | Oct 9 | Apr 9 | Nov 5 |
| 1958 | Apr 29 | Oct 1 | Apr 29 | Nov 6 |
| 1957 | May 4 | Oct 19 | Apr 14 | Oct 25 |
| 1956 | Apr 24 | Nov 7 | Apr 24 | Nov 8 |
| 1955 | Apr 7 | Oct 15 | Mar 29 | Oct 24 |
| 1954 | May 7 | Oct 28 | Apr 8 | Oct 30 |
| 1953 | Apr 27 | Oct 27 | Apr 20 | Oct 27 |
| 1952 | Apr 16 | Oct 5 | Apr 11 | Oct 5 |
| 1951 | Apr 23 | Sep 28 | Apr 19 | Oct 24 |
"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.