Port Alsworth Alaska Weather Records (USR0000APAL)

Record envelope, standing records and threshold days for Port Alsworth Alaska (USR0000APAL), Alaska, United States, with 32 years of record.

Key Facts for Port Alsworth Alaska

Port Alsworth Alaska (USR0000APAL) is a weather station in Alaska, United States at 60.20 latitude and -154.32 longitude, 79 m (260 ft) above sea level.
The station reports from 1992 to 2023, 32 years of record.
1,464 records set at Port Alsworth Alaska still stand.
Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
Port Alsworth Alaska set a daily record high minimum temperature of 10.0 C (50.0 F) on 25 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Alaska, United States, 60.20 latitude, -154.32 longitude.
Elevation: 79 m (260 ft).
Period of record: 1992 to 2023, 32 years.
Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

20 days at or beyond a record

The band shows the record high and record low for each calendar day at Port Alsworth Alaska. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Port Alsworth Alaska, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-42.2 C (-44.0 F)	7.2 C (45.0 F)	-38.9 C (-38.0 F)
Feb	12.8 C (55.0 F)	-43.9 C (-47.0 F)	8.3 C (46.9 F)	-37.2 C (-35.0 F)
Mar	15.6 C (60.1 F)	-35.0 C (-31.0 F)	6.1 C (43.0 F)	-35.0 C (-31.0 F)
Apr	22.2 C (72.0 F)	-22.8 C (-9.0 F)	14.4 C (57.9 F)	-15.6 C (3.9 F)
May	29.4 C (84.9 F)	-14.4 C (6.1 F)	16.7 C (62.1 F)	-5.6 C (21.9 F)
Jun	32.2 C (90.0 F)	-3.3 C (26.1 F)	28.3 C (82.9 F)	-3.3 C (26.1 F)
Jul	33.9 C (93.0 F)	0.6 C (33.1 F)	27.2 C (81.0 F)	1.1 C (34.0 F)
Aug	31.7 C (89.1 F)	-2.2 C (28.0 F)	26.1 C (79.0 F)	1.1 C (34.0 F)
Sep	25.0 C (77.0 F)	-12.2 C (10.0 F)	20.0 C (68.0 F)	-3.9 C (25.0 F)
Oct	19.4 C (66.9 F)	-20.0 C (-4.0 F)	14.4 C (57.9 F)	-5.0 C (23.0 F)
Nov	13.3 C (55.9 F)	-33.3 C (-27.9 F)	n/a	n/a
Dec	12.8 C (55.0 F)	-37.2 C (-35.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Port Alsworth Alaska still stand. 1996 holds the most, with 56.

Standing records at Port Alsworth Alaska by the year they were set
Year set	Standing records
1992	29
1993	34
1994	46
1995	51
1996	56
1997	55
1998	39
1999	54
2000	53
2001	43
2002	47
2003	56
2004	56
2005	41
2006	26
2007	42
2008	53
2009	43
2010	50
2011	30
2012	54
2013	54
2014	44
2015	52
2016	44
2017	24
2018	32
2019	51
2020	13
2021	51
2022	17
2023	26
2024	43
2025	28
2026	27

Period of Record Coverage

1992 to 2026

35 years of record at Port Alsworth Alaska, 1992 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1992, 1993, 1995, 1996, 2006, 2009, 2012, 2013 and others.

Days with data per year at Port Alsworth Alaska
Year	Days with data	Share of year	Complete
1992	161	44%	No
1993	252	69%	No
1994	338	93%	Yes
1995	304	83%	No
1996	303	83%	No
1997	359	98%	Yes
1998	360	99%	Yes
1999	360	99%	Yes
2000	365	100%	Yes
2001	352	96%	Yes
2002	359	98%	Yes
2003	355	97%	Yes
2004	352	96%	Yes
2005	360	99%	Yes
2006	203	56%	No
2007	362	99%	Yes
2008	363	99%	Yes
2009	308	84%	No
2010	362	99%	Yes
2011	360	99%	Yes
2012	312	85%	No
2013	268	73%	No
2014	339	93%	Yes
2015	365	100%	Yes
2016	365	100%	Yes
2017	337	92%	Yes
2018	362	99%	Yes
2019	360	99%	Yes
2020	363	99%	Yes
2021	361	99%	Yes
2022	231	63%	No
2023	364	100%	Yes
2024	364	99%	Yes
2025	363	99%	Yes
2026	283	78%	No

Latest Records

Latest records at Port Alsworth Alaska
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 September 2026	Port Alsworth Alaska, US	daily high min (Provisional)	10.0 C (50.0 F)	1.7 C (3.1 F)	31 years	15 of 100 (Routine)
2 September 2026	Port Alsworth Alaska, US	daily low min (Tie, Provisional)	-1.1 C (30.0 F)	tie	20 years	2 of 100 (Routine)
17 August 2026	Port Alsworth Alaska, US	daily low max (Tie, Provisional)	12.8 C (55.0 F)	tie	28 years	2 of 100 (Routine)
3 August 2026	Port Alsworth Alaska, US	daily low max (Tie)	14.4 C (57.9 F)	tie	13 years	1 of 100 (Routine)
27 July 2026	Port Alsworth Alaska, US	daily low max (Tie)	13.9 C (57.0 F)	tie	23 years	2 of 100 (Routine)
21 July 2026	Port Alsworth Alaska, US	daily low min (Tie)	4.4 C (39.9 F)	tie	12 years	1 of 100 (Routine)
16 July 2026	Port Alsworth Alaska, US	daily low max	11.1 C (52.0 F)	2.8 C (5.0 F)	25 years	16 of 100 (Routine)
15 July 2026	Port Alsworth Alaska, US	daily low max (Tie)	12.2 C (54.0 F)	tie	3 years	0 of 100 (Routine)
13 July 2026	Port Alsworth Alaska, US	daily low max (Tie)	13.3 C (55.9 F)	tie	1 year	0 of 100 (Routine)
12 July 2026	Port Alsworth Alaska, US	daily low max	11.1 C (52.0 F)	1.7 C (3.1 F)	13 years	10 of 100 (Routine)
6 July 2026	Port Alsworth Alaska, US	daily low min (Tie)	4.4 C (39.9 F)	tie	25 years	2 of 100 (Routine)
4 July 2026	Port Alsworth Alaska, US	daily low min	1.1 C (34.0 F)	1.1 C (2.0 F)	3 years	7 of 100 (Routine)
4 July 2026	Port Alsworth Alaska, US	daily low max (Tie)	11.7 C (53.1 F)	tie	24 years	2 of 100 (Routine)
3 July 2026	Port Alsworth Alaska, US	daily low max	12.8 C (55.0 F)	0.5 C (0.9 F)	32 years	13 of 100 (Routine)
29 June 2026	Port Alsworth Alaska, US	daily low max (Tie)	11.1 C (52.0 F)	tie	32 years	3 of 100 (Routine)
5 June 2026	Port Alsworth Alaska, US	daily high max	26.1 C (79.0 F)	0.5 C (0.9 F)	4 years	5 of 100 (Routine)
4 June 2026	Port Alsworth Alaska, US	daily high max (Tie)	28.3 C (82.9 F)	tie	4 years	1 of 100 (Routine)
2 June 2026	Port Alsworth Alaska, US	daily high min (Tie)	8.9 C (48.0 F)	tie	29 years	2 of 100 (Routine)
1 June 2026	Port Alsworth Alaska, US	monthly low min	-3.3 C (26.1 F)	0.5 C (0.9 F)	22 years	20 of 100 (Routine)
12 May 2026	Port Alsworth Alaska, US	daily high min	5.6 C (42.1 F)	0.6 C (1.1 F)	17 years	9 of 100 (Routine)

Climate Trend

22 complete years, 1997 to 2025

One stripe for each of 22 complete years at Port Alsworth Alaska, 1997 to 2025. Blue stripes are years cooler than the station's own mean of 2.4 C (36.3 F); red stripes are warmer. The coolest year was 1999, at -1.1 C (30.1 F), and the warmest was 2016, at 5.0 C (40.9 F). The strongest colour marks a difference of 3.5 C (6.3 F).

Annual mean temperature at Port Alsworth Alaska as warming stripes, 1997 to 2025
Year	Annual mean temperature	Difference from the station mean
1997	2.0 C	-0.41 C
1998	2.0 C	-0.37 C
1999	-1.1 C	-3.47 C
2000	3.1 C	+0.70 C
2001	2.5 C	+0.14 C
2002	3.9 C	+1.54 C
2003	3.7 C	+1.34 C
2004	3.5 C	+1.14 C
2005	3.3 C	+0.87 C
2007	1.4 C	-1.03 C
2008	-0.6 C	-2.96 C
2010	0.8 C	-1.62 C
2011	0.7 C	-1.66 C
2015	3.8 C	+1.43 C
2016	5.0 C	+2.58 C
2018	3.5 C	+1.07 C
2019	4.9 C	+2.46 C
2020	1.5 C	-0.89 C
2021	1.2 C	-1.20 C
2023	1.8 C	-0.55 C
2024	2.3 C	-0.06 C
2025	3.3 C	+0.89 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

1992 to 2026

Yearly extremes at Port Alsworth Alaska: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.9 C (93.0 F)	2019	28.9 C (84.0 F)	35
Coldest night (TNn)	-43.9 C (-47.0 F)	1999	-33.3 C (-27.9 F)	35

Hottest day (TXx)

The hottest day of the year at Port Alsworth Alaska, 1992 to 2026. The record is 33.9 C (93.0 F) in 2019, marked on the chart; the median year is 28.9 C (84.0 F).

Hottest day (TXx) at Port Alsworth Alaska by year
Year	Hottest day (TXx)
1992	27.2 C (81.0 F)
1993	30.0 C (86.0 F)
1994	27.2 C (81.0 F)
1995	27.8 C (82.0 F)
1996	28.9 C (84.0 F)
1997	30.0 C (86.0 F)
1998	26.7 C (80.1 F)
1999	27.2 C (81.0 F)
2000	29.4 C (84.9 F)
2001	27.8 C (82.0 F)
2002	31.1 C (88.0 F)
2003	31.7 C (89.1 F)
2004	31.7 C (89.1 F)
2005	30.6 C (87.1 F)
2006	25.0 C (77.0 F)
2007	28.9 C (84.0 F)
2008	26.1 C (79.0 F)
2009	31.1 C (88.0 F)
2010	25.6 C (78.1 F)
2011	26.1 C (79.0 F)
2012	28.3 C (82.9 F)
2013	32.2 C (90.0 F)
2014	27.8 C (82.0 F)
2015	32.2 C (90.0 F)
2016	29.4 C (84.9 F)
2017	29.4 C (84.9 F)
2018	30.0 C (86.0 F)
2019	33.9 C (93.0 F)
2020	27.8 C (82.0 F)
2021	28.3 C (82.9 F)
2022	29.4 C (84.9 F)
2023	27.8 C (82.0 F)
2024	30.6 C (87.1 F)
2025	27.2 C (81.0 F)
2026	28.3 C (82.9 F)

Coldest night (TNn)

The coldest night of the year at Port Alsworth Alaska, 1992 to 2026. The record is -43.9 C (-47.0 F) in 1999, marked on the chart; the median year is -33.3 C (-27.9 F).

Coldest night (TNn) at Port Alsworth Alaska by year
Year	Coldest night (TNn)
1992	-18.3 C (-0.9 F)
1993	-22.8 C (-9.0 F)
1994	-34.4 C (-29.9 F)
1995	-35.0 C (-31.0 F)
1996	-33.3 C (-27.9 F)
1997	-42.2 C (-44.0 F)
1998	-35.0 C (-31.0 F)
1999	-43.9 C (-47.0 F)
2000	-37.8 C (-36.0 F)
2001	-32.2 C (-26.0 F)
2002	-20.6 C (-5.1 F)
2003	-19.4 C (-2.9 F)
2004	-32.2 C (-26.0 F)
2005	-23.3 C (-9.9 F)
2006	-36.7 C (-34.1 F)
2007	-37.8 C (-36.0 F)
2008	-38.9 C (-38.0 F)
2009	-40.6 C (-41.1 F)
2010	-35.0 C (-31.0 F)
2011	-37.2 C (-35.0 F)
2012	-41.7 C (-43.1 F)
2013	-27.8 C (-18.0 F)
2014	-27.8 C (-18.0 F)
2015	-28.3 C (-18.9 F)
2016	-25.0 C (-13.0 F)
2017	-37.8 C (-36.0 F)
2018	-27.2 C (-17.0 F)
2019	-31.7 C (-25.1 F)
2020	-35.0 C (-31.0 F)
2021	-33.3 C (-27.9 F)
2022	-32.2 C (-26.0 F)
2023	-26.1 C (-15.0 F)
2024	-37.8 C (-36.0 F)
2025	-30.6 C (-23.1 F)
2026	-38.9 C (-38.0 F)

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

22 years with a frost

Across 22 years with a frost, the median last spring frost at Port Alsworth Alaska falls on 10 June and the median first autumn frost on 6 September, which leaves a median of 89 days between them.

Frost dates and growing season at Port Alsworth Alaska
Measure	Median, all years	Earliest period	Recent period (1997 to 2025)	Recent against earliest	Fitted trend
Last spring frost	10 June	n/a	10 June	n/a	n/a
First autumn frost	6 September	n/a	6 September	n/a	n/a
Growing days	89 days	n/a	89 days	n/a	n/a

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.

Download the Data

Data for Port Alsworth Alaska standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Alsworth Alaska 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).