Juneau Dwtn, AK: frost dates by year

Last spring and first fall frost at NOAA station USC00504094, 1966 to 2021, measured from daily minimum temperatures.

Elevation 50 ft, 58.299, -134.411. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 22	Oct 19
Earliest	Mar 14 (2016)	Sep 13 (1992)
Latest	May 19 (1992)	Nov 11 (1980)
Trend	3.5 days earlier per decade	little change (less than half a day per decade)
Years with data	28	29

At 28°F (hard freeze) the median last spring date is Apr 4 and the median first fall date is Nov 2.

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 22	no data	Apr 11	no data
2020	Apr 12	Oct 17	Apr 11	Nov 2
2019	Apr 11	Oct 8	Mar 8	Nov 27
2018	Apr 17	Nov 3	Apr 4	Nov 7
2016	Mar 14	Oct 10	Feb 19	Nov 19
2015	Apr 22	no data	Mar 17	no data
2014	Apr 14	no data	Apr 13	no data
2013	May 1	no data	Apr 29	no data
2012	Apr 9	Oct 19	Apr 1	Oct 27
2011	no data	Nov 3	no data	Nov 3
2009	Apr 23	no data	Apr 3	no data
2007	Apr 20	no data	Apr 4	no data
2005	no data	Nov 5	no data	Nov 6
2004	no data	Oct 19	no data	Oct 23
1996	no data	Sep 29	no data	Oct 1
1993	Apr 12	Oct 23	Apr 7	Nov 18
1992	May 19	Sep 13	Apr 9	Oct 14
1991	no data	Oct 16	no data	Oct 16
1990	no data	Oct 5	no data	Oct 31
1989	Apr 22	Oct 14	Apr 9	Oct 27
1988	Apr 20	no data	Feb 23	no data
1987	Apr 23	Oct 30	Mar 21	Dec 15
1986	May 10	Oct 29	Apr 13	Oct 31
1985	Apr 23	Oct 15	Apr 11	Nov 5
1984	May 7	Oct 20	Feb 10	Oct 27
1983	Apr 11	Sep 27	Apr 10	Sep 27
1982	May 3	Oct 16	Apr 14	Oct 28
1981	Apr 27	Oct 4	Mar 19	Nov 19
1980	Apr 17	Nov 11	Mar 16	Nov 30
1979	Apr 28	Nov 2	Apr 2	Nov 6
1978	no data	Nov 2	no data	Nov 8
1977	Apr 21	no data	Mar 24	no data
1976	no data	Oct 23	no data	Oct 24
1969	May 13	Oct 26	Mar 19	Nov 11
1968	May 4	Oct 12	Apr 11	Oct 30
1967	Apr 20	Nov 1	Mar 31	Nov 12
1966	no data	Oct 12	no data	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.