Frost history / Brownlee Dam, ID
Brownlee Dam, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00101180, 1966 to 2012, measured from daily minimum temperatures.
Elevation 1,844 ft, 44.836, -116.898. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 8 | Nov 2 |
| Earliest | Feb 21 (1986) | Oct 6 (1974) |
| Latest | May 5 (1977) | Dec 2 (1998) |
| Trend | 7.9 days earlier per decade | 4.3 days later per decade |
| Years with data | 44 | 43 |
At 28°F (hard freeze) the median last spring date is Mar 13 and the median first fall date is Nov 16.
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 |
|---|---|---|---|---|
| 2012 | Mar 8 | no data | Mar 7 | no data |
| 2011 | no data | Nov 2 | no data | Nov 16 |
| 2010 | Apr 12 | Nov 23 | Apr 3 | Nov 23 |
| 2009 | Mar 31 | Oct 11 | Mar 13 | Nov 15 |
| 2008 | Apr 21 | Nov 23 | Mar 31 | Nov 27 |
| 2007 | Mar 2 | Nov 14 | Mar 2 | Nov 21 |
| 2006 | Mar 13 | no data | Mar 12 | no data |
| 2005 | Feb 27 | Nov 9 | Feb 18 | Nov 15 |
| 2004 | Mar 3 | Nov 2 | Feb 22 | Nov 29 |
| 2003 | Mar 2 | Nov 1 | Feb 26 | Nov 1 |
| 2002 | Mar 19 | Oct 31 | Mar 18 | Oct 31 |
| 2001 | Apr 9 | Nov 27 | Mar 3 | Nov 27 |
| 2000 | Apr 8 | Nov 11 | Feb 25 | Nov 16 |
| 1999 | Apr 11 | Nov 22 | Mar 6 | Dec 4 |
| 1998 | Mar 8 | Dec 2 | Mar 8 | Dec 6 |
| 1997 | Apr 4 | Nov 4 | Mar 4 | Dec 5 |
| 1995 | Apr 16 | no data | Mar 8 | no data |
| 1994 | Mar 25 | Nov 2 | Mar 24 | Nov 3 |
| 1993 | Mar 11 | Nov 5 | Mar 4 | Nov 7 |
| 1992 | Apr 7 | Nov 10 | Feb 6 | Nov 24 |
| 1991 | Apr 11 | Oct 30 | Mar 7 | Oct 30 |
| 1990 | Mar 25 | Oct 20 | Mar 13 | Dec 2 |
| 1989 | Mar 30 | Oct 20 | Mar 4 | Nov 27 |
| 1988 | Apr 9 | Nov 15 | Mar 28 | Nov 27 |
| 1987 | Mar 30 | Nov 14 | Mar 29 | Nov 17 |
| 1986 | Feb 21 | Nov 10 | Feb 14 | Nov 10 |
| 1985 | Apr 20 | Oct 9 | Mar 26 | Oct 9 |
| 1984 | Mar 26 | Oct 21 | Mar 7 | Nov 15 |
| 1983 | May 3 | Nov 20 | Feb 8 | Nov 21 |
| 1982 | Apr 20 | Oct 19 | Mar 16 | Nov 12 |
| 1981 | Apr 14 | Nov 25 | Mar 7 | Nov 28 |
| 1980 | Apr 9 | Oct 23 | Mar 16 | Nov 13 |
| 1979 | Apr 26 | Oct 30 | Mar 18 | Nov 9 |
| 1978 | Apr 23 | Oct 22 | Mar 16 | Oct 30 |
| 1977 | May 5 | Nov 3 | Apr 2 | Nov 3 |
| 1976 | Apr 19 | Oct 18 | Apr 2 | Nov 13 |
| 1975 | Apr 11 | Oct 24 | Apr 2 | Oct 24 |
| 1974 | Apr 13 | Oct 6 | Mar 21 | Nov 16 |
| 1973 | Apr 8 | Nov 2 | Mar 18 | Nov 2 |
| 1972 | May 1 | Oct 30 | Mar 27 | Dec 4 |
| 1971 | Apr 1 | Oct 28 | Mar 19 | Oct 28 |
| 1970 | Apr 27 | Oct 27 | Feb 5 | Oct 27 |
| 1969 | Mar 25 | Oct 13 | Mar 13 | Nov 27 |
| 1968 | Apr 20 | Nov 5 | Apr 13 | Dec 13 |
| 1967 | Apr 22 | Nov 4 | Mar 13 | Nov 25 |
| 1966 | no data | Oct 22 | no data | Dec 9 |
"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.