Mcnary Dam, WA: frost dates by year

Last spring and first fall frost at NOAA station USC00455231, 1955 to 2007, measured from daily minimum temperatures.

Elevation 361 ft, 45.941, -119.298. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 30	Nov 2
Earliest	Mar 2 (2004)	Oct 7 (1970)
Latest	Apr 28 (1970)	Dec 4 (1999)
Trend	3.2 days earlier per decade	1.0 days later per decade
Years with data	52	49

At 28°F (hard freeze) the median last spring date is Mar 9 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
2007	Apr 4	no data	Feb 4	no data
2006	Mar 14	no data	Mar 3	no data
2004	Mar 2	Nov 4	Feb 14	Nov 21
2003	Mar 3	Oct 31	Feb 27	Nov 1
2002	Apr 4	Oct 25	Mar 23	Oct 30
2001	Mar 23	Nov 8	Mar 2	Nov 8
2000	Mar 9	Nov 11	Feb 20	Nov 11
1999	Apr 16	Dec 4	Feb 21	Dec 22
1998	Mar 20	Oct 30	Jan 15	Dec 19
1997	Apr 13	Oct 26	Feb 12	Dec 22
1996	Mar 26	Nov 1	Mar 26	Nov 24
1995	Mar 29	Oct 30	Mar 8	Nov 1
1994	Mar 26	Nov 3	Mar 23	Nov 21
1993	Mar 14	Nov 5	Mar 12	Nov 6
1992	Mar 29	Nov 10	Feb 6	Nov 24
1991	Mar 17	Oct 29	Mar 17	Oct 30
1990	Mar 28	Nov 26	Mar 26	Dec 7
1989	Mar 6	Oct 29	Mar 6	Dec 11
1988	Mar 20	Nov 30	Feb 26	Dec 15
1987	Mar 31	Nov 17	Mar 30	Nov 17
1986	Apr 25	Nov 10	Apr 25	Nov 10
1985	Mar 26	Oct 9	Mar 26	Nov 11
1984	Mar 6	Oct 21	Mar 5	Oct 23
1983	Apr 5	Nov 29	Feb 7	Dec 2
1982	Apr 21	Oct 20	Feb 26	Nov 10
1981	Apr 15	no data	Mar 19	no data
1980	Apr 2	Oct 13	Mar 6	Dec 6
1979	Mar 13	Nov 12	Mar 2	Nov 20
1978	Mar 15	Oct 23	Jan 24	Nov 1
1977	Mar 18	Nov 3	Feb 1	Nov 19
1976	Apr 1	Oct 19	Mar 12	Nov 23
1975	Apr 6	Nov 11	Mar 29	Nov 17
1974	Mar 23	Nov 19	Mar 21	Dec 23
1973	Apr 9	Nov 5	Feb 22	Dec 30
1972	Apr 4	Oct 30	Feb 8	Oct 30
1971	Apr 12	Oct 18	Mar 19	Oct 29
1970	Apr 28	Oct 7	Feb 28	Oct 31
1969	Mar 25	Oct 13	Mar 14	Oct 14
1968	Apr 13	Nov 1	Feb 17	Dec 19
1967	Mar 13	Nov 4	Mar 12	Nov 4
1966	Apr 19	Nov 11	Mar 23	none
1965	Mar 25	Nov 23	Mar 25	Nov 29
1964	Apr 18	Nov 6	Mar 25	Nov 14
1963	Apr 16	Oct 27	Mar 10	Nov 21
1962	Mar 31	Nov 18	Mar 13	Nov 29
1961	Apr 4	Oct 21	Jan 28	Nov 5
1960	Apr 22	Oct 30	Mar 12	Nov 4
1959	Apr 9	Oct 30	Mar 20	Nov 5
1958	Mar 13	Oct 22	Mar 13	Nov 16
1957	Mar 13	Nov 2	Feb 23	Nov 4
1956	Apr 6	Nov 14	Mar 12	Nov 18
1955	Apr 6	Nov 12	Mar 26	Nov 12

"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.