Record envelope, standing records and threshold days for Port Alexander (USC00507557), Alaska, United States, with 69 years of record.
Key Facts for Port Alexander
Port Alexander (USC00507557) is a weather station in Alaska, United States at 56.25 latitude and -134.64 longitude, 4 m (12 ft) above sea level.
The station reports from 1949 to 2017, 69 years of record.
1,464 records set at Port Alexander still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Port Alexander tied a daily record low maximum temperature of 13.3 C (55.9 F) on 29 July 2017.
About the Station
Location: Alaska, United States, 56.25 latitude, -134.64 longitude.
Elevation: 4 m (12 ft).
Period of record: 1949 to 2017, 69 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Port Alexander. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Port Alexander, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.1 C (52.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Feb
11.1 C (52.0 F)
-15.6 C (3.9 F)
n/a
n/a
Mar
12.2 C (54.0 F)
-13.9 C (7.0 F)
n/a
n/a
Apr
21.7 C (71.1 F)
-7.8 C (18.0 F)
n/a
n/a
May
25.0 C (77.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
30.0 C (86.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
28.9 C (84.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
27.8 C (82.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
23.3 C (73.9 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
16.7 C (62.1 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
12.8 C (55.0 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
12.2 C (54.0 F)
-17.8 C (0.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Port Alexander still stand. 1955 holds the most, with 58.
Standing records at Port Alexander by the year they were set
Year set
Standing records
1949
20
1950
46
1951
49
1952
41
1953
26
1954
49
1955
58
1956
47
1957
19
1958
43
1959
21
1960
18
1961
26
1962
29
1963
16
1978
2
1979
33
1980
29
1981
43
1982
37
1983
22
1984
31
1985
25
1986
25
1987
27
1988
8
1989
23
1990
28
1991
8
1992
32
1993
32
1994
25
1995
38
1996
28
1997
26
1998
18
1999
16
2000
9
2001
16
2002
31
2003
27
2004
40
2005
38
2006
32
2007
15
2008
14
2009
13
2010
21
2011
13
2012
20
2013
14
2014
24
2015
42
2016
23
2017
8
All-Time Record Progression
6 new records
6 all-time records were set at Port Alexander between 28 January 1996 and 23 June 2012. Each dot is a new record.
When Port Alexander set new all-time records
Date
Kind
Detail
1996-01-28
Record low minimum temperature
Record low minimum temperature -18.3 C (-0.9 F)
1999-09-18
Record daily precipitation
Record daily precipitation 198.4 mm (7.8 in)
2002-11-26
Record daily precipitation
Record daily precipitation 224.0 mm (8.8 in)
2004-06-19
Record high maximum temperature
Record high maximum temperature 28.3 C (82.9 F)
2004-06-20
Record high maximum temperature
Record high maximum temperature 30.0 C (86.0 F)
2012-06-23
Record high minimum temperature
Record high minimum temperature 16.7 C (62.1 F)
Wettest Day of Each Month
Nov: 224.0 mm (8.8 in)
The wettest day on record for each calendar month at Port Alexander. The most was 224.0 mm (8.8 in) on 26 November 2002.
Record daily precipitation for each month at Port Alexander
Month
Record daily precipitation (mm)
Date
Jan
180.8 mm (7.1 in)
16 January 1985
Feb
116.8 mm (4.6 in)
26 February 1993
Mar
101.6 mm (4.0 in)
22 March 1952
Apr
108.7 mm (4.3 in)
15 April 1999
May
125.7 mm (4.9 in)
6 May 1982
Jun
104.4 mm (4.1 in)
18 June 1992
Jul
193.5 mm (7.6 in)
7 July 1952
Aug
139.4 mm (5.5 in)
31 August 1988
Sep
198.4 mm (7.8 in)
18 September 1999
Oct
176.3 mm (6.9 in)
9 October 1960
Nov
224.0 mm (8.8 in)
26 November 2002
Dec
155.7 mm (6.1 in)
10 December 1962
Period of Record Coverage
1949 to 2017
Complete yearUnder 90 percent of days
55 years of record at Port Alexander, 1949 to 2017. 17 years have data for under 90 percent of days and are left out of rankings: 1949, 1963, 1978, 1979, 1988, 1991, 1998, 1999 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 27 complete years at Port Alexander, 1950 to 2011. Blue stripes are years cooler than the station's own mean of 6.7 C (44.1 F); red stripes are warmer. The coolest year was 1950, at 5.5 C (41.9 F), and the warmest was 1993, at 8.4 C (47.1 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Port Alexander as warming stripes, 1950 to 2011
Year
Annual mean temperature
Difference from the station mean
1950
5.5 C
-1.25 C
1951
5.8 C
-0.91 C
1952
6.7 C
-0.01 C
1953
6.9 C
+0.17 C
1954
6.0 C
-0.76 C
1955
5.6 C
-1.19 C
1956
5.6 C
-1.16 C
1957
7.2 C
+0.42 C
1959
6.8 C
+0.08 C
1960
7.2 C
+0.42 C
1961
6.7 C
-0.05 C
1962
6.7 C
-0.09 C
1980
6.9 C
+0.10 C
1983
7.5 C
+0.78 C
1985
6.4 C
-0.39 C
1987
7.5 C
+0.70 C
1989
7.2 C
+0.40 C
1990
6.9 C
+0.16 C
1992
7.2 C
+0.45 C
1993
8.4 C
+1.66 C
1994
6.9 C
+0.17 C
1995
6.9 C
+0.16 C
1996
6.2 C
-0.58 C
2006
6.8 C
+0.09 C
2007
7.1 C
+0.36 C
2008
6.5 C
-0.21 C
2011
7.2 C
+0.45 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1949 to 2017
Yearly extremes at Port Alexander: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
30.0 C (86.0 F)
2004
24.4 C (75.9 F)
55
Coldest night (TNn)
-18.3 C (-0.9 F)
1996
-10.0 C (14.0 F)
55
Wettest day (Rx1day)
224.0 mm (8.8 in)
2002
119.9 mm (4.7 in)
55
Wettest five days (Rx5day)
404.3 mm (15.9 in)
2004
266.5 mm (10.5 in)
55
Longest dry spell (CDD)
27 days
1951
14 days
55
Hottest day (TXx)
The hottest day of the year at Port Alexander, 1949 to 2017. The record is 30.0 C (86.0 F) in 2004, marked on the chart; the median year is 24.4 C (75.9 F).
Hottest day (TXx) at Port Alexander by year
Year
Hottest day (TXx)
1949
21.1 C (70.0 F)
1950
23.9 C (75.0 F)
1951
26.1 C (79.0 F)
1952
25.6 C (78.1 F)
1953
22.2 C (72.0 F)
1954
22.2 C (72.0 F)
1955
22.8 C (73.0 F)
1956
23.3 C (73.9 F)
1957
25.0 C (77.0 F)
1958
26.7 C (80.1 F)
1959
21.7 C (71.1 F)
1960
21.7 C (71.1 F)
1961
22.2 C (72.0 F)
1962
22.8 C (73.0 F)
1963
23.9 C (75.0 F)
1978
10.0 C (50.0 F)
1979
22.2 C (72.0 F)
1980
27.2 C (81.0 F)
1981
23.9 C (75.0 F)
1982
25.6 C (78.1 F)
1983
24.4 C (75.9 F)
1984
21.7 C (71.1 F)
1985
22.8 C (73.0 F)
1986
25.0 C (77.0 F)
1987
25.0 C (77.0 F)
1988
23.3 C (73.9 F)
1989
25.0 C (77.0 F)
1990
26.7 C (80.1 F)
1991
26.7 C (80.1 F)
1992
27.2 C (81.0 F)
1993
27.8 C (82.0 F)
1994
24.4 C (75.9 F)
1995
24.4 C (75.9 F)
1996
26.1 C (79.0 F)
1997
25.6 C (78.1 F)
1998
24.4 C (75.9 F)
1999
27.2 C (81.0 F)
2000
23.3 C (73.9 F)
2001
22.8 C (73.0 F)
2002
25.6 C (78.1 F)
2003
23.3 C (73.9 F)
2004
30.0 C (86.0 F)
2005
27.8 C (82.0 F)
2006
23.3 C (73.9 F)
2007
25.0 C (77.0 F)
2008
22.2 C (72.0 F)
2009
28.9 C (84.0 F)
2010
25.0 C (77.0 F)
2011
23.3 C (73.9 F)
2012
28.3 C (82.9 F)
2013
27.2 C (81.0 F)
2014
23.9 C (75.0 F)
2015
26.1 C (79.0 F)
2016
23.9 C (75.0 F)
2017
20.6 C (69.1 F)
Coldest night (TNn)
The coldest night of the year at Port Alexander, 1949 to 2017. The record is -18.3 C (-0.9 F) in 1996, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at Port Alexander by year
Year
Coldest night (TNn)
1949
-13.9 C (7.0 F)
1950
-11.7 C (10.9 F)
1951
-13.3 C (8.1 F)
1952
-12.8 C (9.0 F)
1953
-15.6 C (3.9 F)
1954
-15.6 C (3.9 F)
1955
-13.9 C (7.0 F)
1956
-11.7 C (10.9 F)
1957
-10.0 C (14.0 F)
1958
-4.4 C (24.1 F)
1959
-10.0 C (14.0 F)
1960
-3.3 C (26.1 F)
1961
-7.8 C (18.0 F)
1962
-9.4 C (15.1 F)
1963
-10.6 C (12.9 F)
1978
-5.6 C (21.9 F)
1979
-12.2 C (10.0 F)
1980
-11.7 C (10.9 F)
1981
-7.8 C (18.0 F)
1982
-12.8 C (9.0 F)
1983
-3.9 C (25.0 F)
1984
-9.4 C (15.1 F)
1985
-17.2 C (1.0 F)
1986
-11.1 C (12.0 F)
1987
-7.2 C (19.0 F)
1988
-6.1 C (21.0 F)
1989
-13.3 C (8.1 F)
1990
-12.2 C (10.0 F)
1991
-3.9 C (25.0 F)
1992
-17.8 C (0.0 F)
1993
-7.2 C (19.0 F)
1994
-15.0 C (5.0 F)
1995
-14.4 C (6.1 F)
1996
-18.3 C (-0.9 F)
1997
-13.9 C (7.0 F)
1998
-5.0 C (23.0 F)
1999
-6.1 C (21.0 F)
2000
-6.7 C (19.9 F)
2001
-7.8 C (18.0 F)
2002
-6.7 C (19.9 F)
2003
-12.2 C (10.0 F)
2004
-10.0 C (14.0 F)
2005
-9.4 C (15.1 F)
2006
-11.7 C (10.9 F)
2007
-8.9 C (16.0 F)
2008
-10.6 C (12.9 F)
2009
-10.0 C (14.0 F)
2010
-3.9 C (25.0 F)
2011
-9.4 C (15.1 F)
2012
-11.1 C (12.0 F)
2013
-6.7 C (19.9 F)
2014
-5.6 C (21.9 F)
2015
-6.7 C (19.9 F)
2016
-0.6 C (30.9 F)
2017
1.1 C (34.0 F)
Wettest day (Rx1day)
The wettest day of the year at Port Alexander, 1949 to 2017. The record is 224.0 mm (8.8 in) in 2002, marked on the chart; the median year is 119.9 mm (4.7 in).
Wettest day (Rx1day) at Port Alexander by year
Year
Wettest day (Rx1day)
1949
132.1 mm (5.2 in)
1950
101.3 mm (4.0 in)
1951
97.8 mm (3.9 in)
1952
193.5 mm (7.6 in)
1953
113.5 mm (4.5 in)
1954
89.2 mm (3.5 in)
1955
132.1 mm (5.2 in)
1956
113.3 mm (4.5 in)
1957
103.9 mm (4.1 in)
1958
148.1 mm (5.8 in)
1959
118.9 mm (4.7 in)
1960
176.3 mm (6.9 in)
1961
146.1 mm (5.8 in)
1962
163.8 mm (6.4 in)
1963
118.1 mm (4.6 in)
1978
59.7 mm (2.4 in)
1979
175.5 mm (6.9 in)
1980
131.3 mm (5.2 in)
1981
92.2 mm (3.6 in)
1982
146.8 mm (5.8 in)
1983
102.1 mm (4.0 in)
1984
119.9 mm (4.7 in)
1985
180.8 mm (7.1 in)
1986
136.7 mm (5.4 in)
1987
116.3 mm (4.6 in)
1988
139.4 mm (5.5 in)
1989
108.0 mm (4.3 in)
1990
120.9 mm (4.8 in)
1991
133.4 mm (5.3 in)
1992
116.3 mm (4.6 in)
1993
116.8 mm (4.6 in)
1994
185.4 mm (7.3 in)
1995
71.9 mm (2.8 in)
1996
123.4 mm (4.9 in)
1997
126.7 mm (5.0 in)
1998
117.6 mm (4.6 in)
1999
198.4 mm (7.8 in)
2000
127.0 mm (5.0 in)
2001
82.6 mm (3.3 in)
2002
224.0 mm (8.8 in)
2003
127.3 mm (5.0 in)
2004
160.0 mm (6.3 in)
2005
152.4 mm (6.0 in)
2006
116.3 mm (4.6 in)
2007
110.7 mm (4.4 in)
2008
97.3 mm (3.8 in)
2009
96.0 mm (3.8 in)
2010
111.5 mm (4.4 in)
2011
137.7 mm (5.4 in)
2012
110.5 mm (4.4 in)
2013
115.3 mm (4.5 in)
2014
131.8 mm (5.2 in)
2015
137.9 mm (5.4 in)
2016
74.7 mm (2.9 in)
2017
50.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Port Alexander, 1949 to 2017. The record is 404.3 mm (15.9 in) in 2004, marked on the chart; the median year is 266.5 mm (10.5 in).
Wettest five days (Rx5day) at Port Alexander by year
Year
Wettest five days (Rx5day)
1949
314.7 mm (12.4 in)
1950
239.3 mm (9.4 in)
1951
212.8 mm (8.4 in)
1952
274.5 mm (10.8 in)
1953
269.6 mm (10.6 in)
1954
262.5 mm (10.3 in)
1955
251.2 mm (9.9 in)
1956
278.6 mm (11.0 in)
1957
268.2 mm (10.6 in)
1958
301.1 mm (11.9 in)
1959
276.1 mm (10.9 in)
1960
292.2 mm (11.5 in)
1961
269.1 mm (10.6 in)
1962
372.5 mm (14.7 in)
1963
263.6 mm (10.4 in)
1978
184.4 mm (7.3 in)
1979
302.5 mm (11.9 in)
1980
234.8 mm (9.2 in)
1981
195.1 mm (7.7 in)
1982
320.8 mm (12.6 in)
1983
195.9 mm (7.7 in)
1984
242.0 mm (9.5 in)
1985
304.4 mm (12.0 in)
1986
345.6 mm (13.6 in)
1987
256.0 mm (10.1 in)
1988
252.2 mm (9.9 in)
1989
249.9 mm (9.8 in)
1990
292.9 mm (11.5 in)
1991
339.3 mm (13.4 in)
1992
217.7 mm (8.6 in)
1993
321.0 mm (12.6 in)
1994
290.9 mm (11.5 in)
1995
208.8 mm (8.2 in)
1996
208.9 mm (8.2 in)
1997
202.4 mm (8.0 in)
1998
330.7 mm (13.0 in)
1999
355.6 mm (14.0 in)
2000
214.3 mm (8.4 in)
2001
212.6 mm (8.4 in)
2002
384.3 mm (15.1 in)
2003
267.4 mm (10.5 in)
2004
404.3 mm (15.9 in)
2005
284.0 mm (11.2 in)
2006
266.5 mm (10.5 in)
2007
188.4 mm (7.4 in)
2008
191.0 mm (7.5 in)
2009
273.3 mm (10.8 in)
2010
273.8 mm (10.8 in)
2011
291.0 mm (11.5 in)
2012
248.4 mm (9.8 in)
2013
193.6 mm (7.6 in)
2014
260.3 mm (10.2 in)
2015
251.7 mm (9.9 in)
2016
201.7 mm (7.9 in)
2017
110.8 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Port Alexander, 1949 to 2017. The record is 27 days in 1951, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Port Alexander by year
Year
Longest dry spell (CDD)
1949
9 days
1950
16 days
1951
27 days
1952
12 days
1953
15 days
1954
15 days
1955
16 days
1956
15 days
1957
23 days
1958
23 days
1959
11 days
1960
11 days
1961
16 days
1962
22 days
1963
7 days
1978
4 days
1979
22 days
1980
11 days
1981
15 days
1982
16 days
1983
15 days
1984
8 days
1985
18 days
1986
13 days
1987
10 days
1988
7 days
1989
16 days
1990
14 days
1991
17 days
1992
16 days
1993
13 days
1994
15 days
1995
16 days
1996
15 days
1997
11 days
1998
14 days
1999
10 days
2000
13 days
2001
14 days
2002
12 days
2003
12 days
2004
20 days
2005
9 days
2006
8 days
2007
9 days
2008
12 days
2009
16 days
2010
12 days
2011
11 days
2012
8 days
2013
13 days
2014
14 days
2015
24 days
2016
11 days
2017
5 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
27 years with a frost
Across 27 years with a frost, the median last spring frost at Port Alexander falls on 20 April and the median first autumn frost on 26 October, which leaves a median of 180 days between them.
Fitted over all years, the growing season changes by +2.5 days per decade at this station.
Frost dates and growing season at Port Alexander
Measure
Median, all years
Earliest period
Recent period (1950 to 2011)
Recent against earliest
Fitted trend
Last spring frost
20 April
n/a
20 April
n/a
-2.4 days per decade
First autumn frost
26 October
n/a
26 October
n/a
0.0 days per decade
Growing days
180 days
n/a
180 days
n/a
+2.5 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
39 years, 1950 to 2012
A day with at least 121.1 mm (4.8 in) of rain is expected about once in 2 years. A day with at least 217.8 mm (8.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Port Alexander: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
121.1 mm (4.8 in)
5 years
146.7 mm (5.8 in)
10 years
163.8 mm (6.4 in)
25 years
185.5 mm (7.3 in)
50 years
201.7 mm (7.9 in)
Longer than the 39 years of record
100 years
217.8 mm (8.6 in)
Longer than the 39 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 39 years of values from 1950 to 2012.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 193.5 mm (7.6 in) in 1952; 185.4 mm (7.3 in) in 1994; 180.8 mm (7.1 in) in 1985.
Download the Data
Data for Port Alexander standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Alexander threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.