Record envelope, standing records and threshold days for Mt. Alyeska (USS0049L01S), Alaska, United States, with 43 years of record.
Key Facts for Mt. Alyeska
Mt. Alyeska (USS0049L01S) is a weather station in Alaska, United States at 60.96 latitude and -149.09 longitude, 469 m (1,540 ft) above sea level.
The station reports from 1984 to 2026, 43 years of record.
1,464 records set at Mt. Alyeska still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Mt. Alyeska tied a daily record precipitation of 27.9 mm (1.1 in) on 16 August 2026.
About the Station
Location: Alaska, United States, 60.96 latitude, -149.09 longitude.
Elevation: 469 m (1,540 ft).
Period of record: 1984 to 2026, 43 years.
Eligible elements: prcp.
Daily Record Envelope and 2026
35 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 Mt. Alyeska. The lines show the 2026 daily maximum and minimum. 35 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mt. Alyeska, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.6 C (56.5 F)
-25.7 C (-14.3 F)
6.7 C (44.1 F)
-23.3 C (-9.9 F)
Feb
7.2 C (45.0 F)
-24.4 C (-11.9 F)
7.2 C (45.0 F)
-22.2 C (-8.0 F)
Mar
11.0 C (51.8 F)
-21.6 C (-6.9 F)
-0.6 C (30.9 F)
-21.1 C (-6.0 F)
Apr
14.3 C (57.7 F)
-17.8 C (0.0 F)
5.0 C (41.0 F)
-6.7 C (19.9 F)
May
20.4 C (68.7 F)
-6.2 C (20.8 F)
10.0 C (50.0 F)
-1.1 C (30.0 F)
Jun
25.7 C (78.3 F)
1.3 C (34.3 F)
20.0 C (68.0 F)
3.3 C (37.9 F)
Jul
27.0 C (80.6 F)
4.1 C (39.4 F)
21.7 C (71.1 F)
5.6 C (42.1 F)
Aug
27.0 C (80.6 F)
2.1 C (35.8 F)
23.3 C (73.9 F)
3.3 C (37.9 F)
Sep
19.5 C (67.1 F)
-3.8 C (25.2 F)
17.8 C (64.0 F)
0.6 C (33.1 F)
Oct
12.3 C (54.1 F)
-13.1 C (8.4 F)
7.2 C (45.0 F)
-2.2 C (28.0 F)
Nov
8.1 C (46.6 F)
-19.6 C (-3.3 F)
n/a
n/a
Dec
7.8 C (46.0 F)
-21.6 C (-6.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Mt. Alyeska still stand. 2019 holds the most, with 98.
Standing records at Mt. Alyeska by the year they were set
Year set
Standing records
2001
47
2002
70
2003
53
2004
68
2005
37
2006
39
2007
52
2008
72
2009
64
2010
47
2011
36
2012
82
2013
88
2014
69
2015
65
2016
61
2017
47
2018
48
2019
98
2020
34
2021
71
2022
26
2023
26
2024
58
2025
46
2026
60
Wettest Day of Each Month
Mar: 165.1 mm (6.5 in)
The wettest day on record for each calendar month at Mt. Alyeska. The most was 165.1 mm (6.5 in) on 24 March 2001.
Record daily precipitation for each month at Mt. Alyeska
Month
Record daily precipitation (mm)
Date
Jan
96.5 mm (3.8 in)
4 January 1986
Feb
78.7 mm (3.1 in)
4 February 2003
Mar
165.1 mm (6.5 in)
24 March 2001
Apr
99.1 mm (3.9 in)
15 April 1992
May
58.4 mm (2.3 in)
10 May 2018
Jun
50.8 mm (2.0 in)
16 June 2014
Jul
61.0 mm (2.4 in)
21 July 2009
Aug
86.4 mm (3.4 in)
25 August 1989
Sep
83.8 mm (3.3 in)
1 September 1989
Oct
147.3 mm (5.8 in)
15 October 1989
Nov
86.4 mm (3.4 in)
5 November 2002
Dec
121.9 mm (4.8 in)
6 December 1993
Period of Record Coverage
2001 to 2026
Complete yearUnder 90 percent of days
26 years of record at Mt. Alyeska, 2001 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 2001, 2026.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Mt. Alyeska, 2002 to 2025. Blue stripes are years cooler than the station's own mean of 2.0 C (35.7 F); red stripes are warmer. The coolest year was 2008, at 0.1 C (32.1 F), and the warmest was 2019, at 4.1 C (39.4 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Mt. Alyeska as warming stripes, 2002 to 2025
Year
Annual mean temperature
Difference from the station mean
2002
2.6 C
+0.51 C
2003
2.5 C
+0.46 C
2004
2.8 C
+0.77 C
2007
1.7 C
-0.35 C
2008
0.1 C
-1.99 C
2009
1.7 C
-0.32 C
2010
1.9 C
-0.12 C
2011
0.9 C
-1.11 C
2012
0.1 C
-1.92 C
2013
1.9 C
-0.14 C
2014
3.4 C
+1.36 C
2015
3.1 C
+1.08 C
2017
1.7 C
-0.36 C
2018
2.9 C
+0.84 C
2019
4.1 C
+2.07 C
2020
1.4 C
-0.60 C
2021
0.7 C
-1.34 C
2022
2.6 C
+0.53 C
2023
1.8 C
-0.22 C
2024
2.1 C
+0.04 C
2025
2.8 C
+0.71 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
1984 to 2026
Yearly extremes at Mt. Alyeska: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
27.0 C (80.6 F)
2004
23.1 C (73.6 F)
26
Coldest night (TNn)
-25.7 C (-14.3 F)
2009
-20.8 C (-5.5 F)
26
Wettest day (Rx1day)
165.1 mm (6.5 in)
2001
68.6 mm (2.7 in)
43
Wettest five days (Rx5day)
307.3 mm (12.1 in)
2021
144.7 mm (5.7 in)
43
Longest dry spell (CDD)
33 days
2019
16 days
43
Hottest day (TXx)
The hottest day of the year at Mt. Alyeska, 1984 to 2026. The record is 27.0 C (80.6 F) in 2004, marked on the chart; the median year is 23.1 C (73.6 F).
Hottest day (TXx) at Mt. Alyeska by year
Year
Hottest day (TXx)
1984
n/a
1985
n/a
1986
n/a
1987
n/a
1988
n/a
1989
n/a
1990
n/a
1991
n/a
1992
n/a
1993
n/a
1994
n/a
1995
n/a
1996
n/a
1997
n/a
1998
n/a
1999
n/a
2000
n/a
2001
18.6 C (65.5 F)
2002
22.9 C (73.2 F)
2003
23.9 C (75.0 F)
2004
27.0 C (80.6 F)
2005
25.0 C (77.0 F)
2006
19.7 C (67.5 F)
2007
22.9 C (73.2 F)
2008
18.8 C (65.8 F)
2009
24.5 C (76.1 F)
2010
18.2 C (64.8 F)
2011
20.7 C (69.3 F)
2012
21.4 C (70.5 F)
2013
23.3 C (73.9 F)
2014
21.2 C (70.2 F)
2015
25.4 C (77.7 F)
2016
23.7 C (74.7 F)
2017
22.0 C (71.6 F)
2018
23.9 C (75.0 F)
2019
27.0 C (80.6 F)
2020
24.4 C (75.9 F)
2021
23.9 C (75.0 F)
2022
23.3 C (73.9 F)
2023
21.1 C (70.0 F)
2024
22.8 C (73.0 F)
2025
22.2 C (72.0 F)
2026
23.3 C (73.9 F)
Coldest night (TNn)
The coldest night of the year at Mt. Alyeska, 1984 to 2026. The record is -25.7 C (-14.3 F) in 2009, marked on the chart; the median year is -20.8 C (-5.5 F).
Coldest night (TNn) at Mt. Alyeska by year
Year
Coldest night (TNn)
1984
n/a
1985
n/a
1986
n/a
1987
n/a
1988
n/a
1989
n/a
1990
n/a
1991
n/a
1992
n/a
1993
n/a
1994
n/a
1995
n/a
1996
n/a
1997
n/a
1998
n/a
1999
n/a
2000
n/a
2001
-21.6 C (-6.9 F)
2002
-19.7 C (-3.5 F)
2003
-20.6 C (-5.1 F)
2004
-22.5 C (-8.5 F)
2005
-19.7 C (-3.5 F)
2006
-18.8 C (-1.8 F)
2007
-22.5 C (-8.5 F)
2008
-21.8 C (-7.2 F)
2009
-25.7 C (-14.3 F)
2010
-18.7 C (-1.7 F)
2011
-22.1 C (-7.8 F)
2012
-22.6 C (-8.7 F)
2013
-23.4 C (-10.1 F)
2014
-17.8 C (0.0 F)
2015
-19.7 C (-3.5 F)
2016
-17.8 C (0.0 F)
2017
-21.1 C (-6.0 F)
2018
-18.2 C (-0.8 F)
2019
-19.0 C (-2.2 F)
2020
-22.2 C (-8.0 F)
2021
-20.6 C (-5.1 F)
2022
-20.6 C (-5.1 F)
2023
-19.4 C (-2.9 F)
2024
-24.4 C (-11.9 F)
2025
-21.1 C (-6.0 F)
2026
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Mt. Alyeska, 1984 to 2026. The record is 165.1 mm (6.5 in) in 2001, marked on the chart; the median year is 68.6 mm (2.7 in).
Wettest day (Rx1day) at Mt. Alyeska by year
Year
Wettest day (Rx1day)
1984
58.4 mm (2.3 in)
1985
61.0 mm (2.4 in)
1986
96.5 mm (3.8 in)
1987
83.8 mm (3.3 in)
1988
71.1 mm (2.8 in)
1989
147.3 mm (5.8 in)
1990
61.0 mm (2.4 in)
1991
50.8 mm (2.0 in)
1992
99.1 mm (3.9 in)
1993
121.9 mm (4.8 in)
1994
48.3 mm (1.9 in)
1995
25.4 mm (1.0 in)
1996
53.3 mm (2.1 in)
1997
78.7 mm (3.1 in)
1998
66.0 mm (2.6 in)
1999
61.0 mm (2.4 in)
2000
88.9 mm (3.5 in)
2001
165.1 mm (6.5 in)
2002
86.4 mm (3.4 in)
2003
101.6 mm (4.0 in)
2004
55.9 mm (2.2 in)
2005
76.2 mm (3.0 in)
2006
55.9 mm (2.2 in)
2007
63.5 mm (2.5 in)
2008
58.4 mm (2.3 in)
2009
61.0 mm (2.4 in)
2010
88.9 mm (3.5 in)
2011
121.9 mm (4.8 in)
2012
83.8 mm (3.3 in)
2013
66.0 mm (2.6 in)
2014
73.7 mm (2.9 in)
2015
83.8 mm (3.3 in)
2016
76.2 mm (3.0 in)
2017
68.6 mm (2.7 in)
2018
63.5 mm (2.5 in)
2019
91.4 mm (3.6 in)
2020
76.2 mm (3.0 in)
2021
121.9 mm (4.8 in)
2022
43.2 mm (1.7 in)
2023
68.6 mm (2.7 in)
2024
63.5 mm (2.5 in)
2025
63.5 mm (2.5 in)
2026
43.2 mm (1.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Mt. Alyeska, 1984 to 2026. The record is 307.3 mm (12.1 in) in 2021, marked on the chart; the median year is 144.7 mm (5.7 in).
Wettest five days (Rx5day) at Mt. Alyeska by year
Year
Wettest five days (Rx5day)
1984
94.0 mm (3.7 in)
1985
198.2 mm (7.8 in)
1986
221.0 mm (8.7 in)
1987
157.5 mm (6.2 in)
1988
160.1 mm (6.3 in)
1989
233.7 mm (9.2 in)
1990
144.7 mm (5.7 in)
1991
124.4 mm (4.9 in)
1992
132.2 mm (5.2 in)
1993
134.6 mm (5.3 in)
1994
116.9 mm (4.6 in)
1995
83.9 mm (3.3 in)
1996
94.0 mm (3.7 in)
1997
185.3 mm (7.3 in)
1998
132.0 mm (5.2 in)
1999
157.5 mm (6.2 in)
2000
165.1 mm (6.5 in)
2001
236.2 mm (9.3 in)
2002
261.7 mm (10.3 in)
2003
248.8 mm (9.8 in)
2004
124.5 mm (4.9 in)
2005
162.5 mm (6.4 in)
2006
134.7 mm (5.3 in)
2007
180.3 mm (7.1 in)
2008
142.2 mm (5.6 in)
2009
132.1 mm (5.2 in)
2010
210.8 mm (8.3 in)
2011
213.3 mm (8.4 in)
2012
215.9 mm (8.5 in)
2013
122.0 mm (4.8 in)
2014
142.2 mm (5.6 in)
2015
142.2 mm (5.6 in)
2016
134.7 mm (5.3 in)
2017
144.8 mm (5.7 in)
2018
147.3 mm (5.8 in)
2019
160.0 mm (6.3 in)
2020
187.9 mm (7.4 in)
2021
307.3 mm (12.1 in)
2022
114.2 mm (4.5 in)
2023
127.0 mm (5.0 in)
2024
109.2 mm (4.3 in)
2025
129.5 mm (5.1 in)
2026
99.1 mm (3.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Mt. Alyeska, 1984 to 2026. The record is 33 days in 2019, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Mt. Alyeska by year
Year
Longest dry spell (CDD)
1984
9 days
1985
19 days
1986
15 days
1987
11 days
1988
13 days
1989
14 days
1990
12 days
1991
9 days
1992
17 days
1993
25 days
1994
16 days
1995
3 days
1996
12 days
1997
18 days
1998
13 days
1999
20 days
2000
16 days
2001
17 days
2002
22 days
2003
17 days
2004
20 days
2005
17 days
2006
21 days
2007
13 days
2008
17 days
2009
26 days
2010
15 days
2011
25 days
2012
14 days
2013
28 days
2014
22 days
2015
18 days
2016
14 days
2017
29 days
2018
15 days
2019
33 days
2020
15 days
2021
17 days
2022
13 days
2023
13 days
2024
14 days
2025
18 days
2026
14 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Mt. Alyeska falls on 9 May and the median first autumn frost on 29 September, which leaves a median of 148 days between them.
Frost dates and growing season at Mt. Alyeska
Measure
Median, all years
Earliest period
Recent period (2002 to 2025)
Recent against earliest
Fitted trend
Last spring frost
9 May
n/a
9 May
n/a
n/a
First autumn frost
29 September
n/a
29 September
n/a
n/a
Growing days
148 days
n/a
148 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.
Rainfall Return Levels
36 years, 1985 to 2025
A day with at least 74.1 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 189.2 mm (7.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Mt. Alyeska: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
74.1 mm (2.9 in)
5 years
96.9 mm (3.8 in)
10 years
114.8 mm (4.5 in)
25 years
141.1 mm (5.6 in)
50 years
163.7 mm (6.4 in)
Longer than the 36 years of record
100 years
189.2 mm (7.4 in)
Longer than the 36 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, 36 years of values from 1985 to 2025.
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: 165.1 mm (6.5 in) in 2001; 147.3 mm (5.8 in) in 1989; 121.9 mm (4.8 in) in 1993.
Download the Data
Data for Mt. Alyeska standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mt. Alyeska 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.