Record envelope, standing records and threshold days for Prudhoe Bay (USC00507780), Alaska, United States, with 32 years of record.
Key Facts for Prudhoe Bay
Prudhoe Bay (USC00507780) is a weather station in Alaska, United States at 70.25 latitude and -148.33 longitude, 23 m (75 ft) above sea level.
The station reports from 1968 to 1999, 32 years of record.
1,464 records set at Prudhoe Bay still stand.
Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
Prudhoe Bay tied a daily record high minimum temperature of -1.1 C (30.0 F) on 16 May 1999.
About the Station
Location: Alaska, United States, 70.25 latitude, -148.33 longitude.
Elevation: 23 m (75 ft).
Period of record: 1968 to 1999, 32 years.
Eligible elements: tmax, tmin.
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 Prudhoe Bay. 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 Prudhoe Bay, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
2.8 C (37.0 F)
-52.2 C (-62.0 F)
n/a
n/a
Feb
4.4 C (39.9 F)
-50.0 C (-58.0 F)
n/a
n/a
Mar
1.1 C (34.0 F)
-47.8 C (-54.0 F)
n/a
n/a
Apr
6.1 C (43.0 F)
-43.9 C (-47.0 F)
n/a
n/a
May
12.8 C (55.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Jun
28.3 C (82.9 F)
-7.8 C (18.0 F)
n/a
n/a
Jul
28.3 C (82.9 F)
-2.2 C (28.0 F)
n/a
n/a
Aug
26.7 C (80.1 F)
-5.0 C (23.0 F)
n/a
n/a
Sep
19.4 C (66.9 F)
-17.2 C (1.0 F)
n/a
n/a
Oct
12.2 C (54.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Nov
3.9 C (39.0 F)
-42.8 C (-45.0 F)
n/a
n/a
Dec
1.7 C (35.1 F)
-47.2 C (-53.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Prudhoe Bay still stand. 1989 holds the most, with 95.
Standing records at Prudhoe Bay by the year they were set
Year set
Standing records
1968
2
1969
72
1970
42
1971
39
1972
53
1973
35
1974
67
1975
71
1976
35
1977
29
1978
55
1979
46
1980
36
1981
27
1982
35
1983
40
1984
36
1985
51
1986
34
1987
30
1988
56
1989
95
1990
43
1991
55
1992
48
1993
43
1994
57
1995
58
1996
89
1997
37
1998
40
1999
8
Wettest Day of Each Month
Aug: 25.1 mm (1.0 in)
The wettest day on record for each calendar month at Prudhoe Bay. The most was 25.1 mm (1.0 in) on 27 August 1992.
Record daily precipitation for each month at Prudhoe Bay
Month
Record daily precipitation (mm)
Date
Jan
5.1 mm (0.20 in)
25 January 1991
Feb
3.3 mm (0.13 in)
1 February 1988
Mar
4.6 mm (0.18 in)
3 March 1988
Apr
2.8 mm (0.11 in)
29 April 1996
May
5.3 mm (0.21 in)
24 May 1991
Jun
14.2 mm (0.6 in)
10 June 1987
Jul
14.2 mm (0.6 in)
20 July 1996
Aug
25.1 mm (1.0 in)
27 August 1992
Sep
20.6 mm (0.8 in)
8 September 1985
Oct
9.9 mm (0.39 in)
14 October 1985
Nov
10.4 mm (0.4 in)
14 November 1997
Dec
5.1 mm (0.20 in)
26 December 1995
Period of Record Coverage
1968 to 1999
Complete yearUnder 90 percent of days
32 years of record at Prudhoe Bay, 1968 to 1999. 2 years have data for under 90 percent of days and are left out of rankings: 1968, 1999.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Prudhoe Bay, 1969 to 1998. Blue stripes are years cooler than the station's own mean of -11.8 C (10.7 F); red stripes are warmer. The coolest year was 1974, at -15.0 C (4.9 F), and the warmest was 1998, at -8.2 C (17.2 F). The strongest colour marks a difference of 3.7 C (6.7 F).
Annual mean temperature at Prudhoe Bay as warming stripes, 1969 to 1998
Year
Annual mean temperature
Difference from the station mean
1969
-11.8 C
+0.02 C
1970
-13.2 C
-1.38 C
1971
-13.9 C
-2.11 C
1972
-12.5 C
-0.70 C
1973
-11.7 C
+0.18 C
1974
-15.0 C
-3.21 C
1975
-14.2 C
-2.37 C
1976
-12.7 C
-0.89 C
1977
-11.4 C
+0.44 C
1978
-10.6 C
+1.22 C
1979
-9.9 C
+1.89 C
1980
-11.9 C
-0.08 C
1981
-9.9 C
+1.94 C
1982
-12.4 C
-0.55 C
1983
-12.4 C
-0.53 C
1984
-13.5 C
-1.68 C
1985
-11.8 C
+0.03 C
1986
-12.4 C
-0.56 C
1987
-12.0 C
-0.19 C
1988
-12.1 C
-0.27 C
1989
-9.6 C
+2.27 C
1990
-12.1 C
-0.30 C
1991
-13.3 C
-1.49 C
1992
-12.7 C
-0.84 C
1993
-9.3 C
+2.57 C
1994
-11.7 C
+0.15 C
1995
-10.4 C
+1.47 C
1996
-11.0 C
+0.80 C
1997
-11.3 C
+0.53 C
1998
-8.2 C
+3.63 C
The annual mean temperature here has risen by 0.8 C (0.2 to 1.4) per decade over 1969 to 1998. In Fahrenheit: 1.5 F (0.4 to 2.6) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Prudhoe Bay
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.8 C (0.2 to 1.4) per decade
1.5 F (0.4 to 2.6) per decade
1969 to 1998
30
Rise
Mean daily maximum
0.7 C (0.1 to 1.3) per decade
1.3 F (0.3 to 2.4) per decade
1969 to 1998
30
Rise
Mean daily minimum
0.9 C (0.3 to 1.5) per decade
1.7 F (0.6 to 2.8) per decade
1969 to 1998
30
Rise
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
1968 to 1999
Yearly extremes at Prudhoe Bay: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
28.3 C (82.9 F)
1974
23.6 C (74.5 F)
32
Coldest night (TNn)
-52.2 C (-62.0 F)
1989
-46.7 C (-52.1 F)
32
Wettest day (Rx1day)
25.1 mm (1.0 in)
1992
10.2 mm (0.4 in)
15
Wettest five days (Rx5day)
30.2 mm (1.2 in)
1992
17.8 mm (0.7 in)
15
Longest dry spell (CDD)
127 days
1998
66 days
15
Hottest day (TXx)
The hottest day of the year at Prudhoe Bay, 1968 to 1999. The record is 28.3 C (82.9 F) in 1974, marked on the chart; the median year is 23.6 C (74.5 F).
Hottest day (TXx) at Prudhoe Bay by year
Year
Hottest day (TXx)
1968
-3.9 C (25.0 F)
1969
25.6 C (78.1 F)
1970
21.1 C (70.0 F)
1971
23.9 C (75.0 F)
1972
18.9 C (66.0 F)
1973
26.1 C (79.0 F)
1974
28.3 C (82.9 F)
1975
27.8 C (82.0 F)
1976
23.3 C (73.9 F)
1977
23.9 C (75.0 F)
1978
25.6 C (78.1 F)
1979
24.4 C (75.9 F)
1980
20.0 C (68.0 F)
1981
21.7 C (71.1 F)
1982
22.8 C (73.0 F)
1983
22.8 C (73.0 F)
1984
23.3 C (73.9 F)
1985
22.2 C (72.0 F)
1986
21.1 C (70.0 F)
1987
21.1 C (70.0 F)
1988
22.8 C (73.0 F)
1989
25.6 C (78.1 F)
1990
26.1 C (79.0 F)
1991
28.3 C (82.9 F)
1992
25.6 C (78.1 F)
1993
22.8 C (73.0 F)
1994
27.8 C (82.0 F)
1995
21.7 C (71.1 F)
1996
26.1 C (79.0 F)
1997
23.9 C (75.0 F)
1998
27.8 C (82.0 F)
1999
15.0 C (59.0 F)
Coldest night (TNn)
The coldest night of the year at Prudhoe Bay, 1968 to 1999. The record is -52.2 C (-62.0 F) in 1989, marked on the chart; the median year is -46.7 C (-52.1 F).
Coldest night (TNn) at Prudhoe Bay by year
Year
Coldest night (TNn)
1968
-42.8 C (-45.0 F)
1969
-47.2 C (-53.0 F)
1970
-47.2 C (-53.0 F)
1971
-48.3 C (-54.9 F)
1972
-50.0 C (-58.0 F)
1973
-46.7 C (-52.1 F)
1974
-47.2 C (-53.0 F)
1975
-48.3 C (-54.9 F)
1976
-49.4 C (-56.9 F)
1977
-46.7 C (-52.1 F)
1978
-44.4 C (-47.9 F)
1979
-47.2 C (-53.0 F)
1980
-45.6 C (-50.1 F)
1981
-41.7 C (-43.1 F)
1982
-43.9 C (-47.0 F)
1983
-46.7 C (-52.1 F)
1984
-50.0 C (-58.0 F)
1985
-50.0 C (-58.0 F)
1986
-45.6 C (-50.1 F)
1987
-49.4 C (-56.9 F)
1988
-42.8 C (-45.0 F)
1989
-52.2 C (-62.0 F)
1990
-45.6 C (-50.1 F)
1991
-47.8 C (-54.0 F)
1992
-46.7 C (-52.1 F)
1993
-43.9 C (-47.0 F)
1994
-42.2 C (-44.0 F)
1995
-47.8 C (-54.0 F)
1996
-43.9 C (-47.0 F)
1997
-43.3 C (-45.9 F)
1998
-48.3 C (-54.9 F)
1999
-46.7 C (-52.1 F)
Wettest day (Rx1day)
The wettest day of the year at Prudhoe Bay, 1968 to 1999. The record is 25.1 mm (1.0 in) in 1992, marked on the chart; the median year is 10.2 mm (0.4 in).
Wettest day (Rx1day) at Prudhoe Bay by year
Year
Wettest day (Rx1day)
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
1983
n/a
1984
n/a
1985
20.6 mm (0.8 in)
1986
6.6 mm (0.26 in)
1987
14.2 mm (0.6 in)
1988
15.5 mm (0.6 in)
1989
7.9 mm (0.31 in)
1990
9.4 mm (0.37 in)
1991
8.6 mm (0.34 in)
1992
25.1 mm (1.0 in)
1993
5.8 mm (0.23 in)
1994
14.5 mm (0.6 in)
1995
10.2 mm (0.4 in)
1996
14.2 mm (0.6 in)
1997
11.7 mm (0.5 in)
1998
6.6 mm (0.26 in)
1999
3.8 mm (0.15 in)
Wettest five days (Rx5day)
The wettest five days of the year at Prudhoe Bay, 1968 to 1999. The record is 30.2 mm (1.2 in) in 1992, marked on the chart; the median year is 17.8 mm (0.7 in).
Wettest five days (Rx5day) at Prudhoe Bay by year
Year
Wettest five days (Rx5day)
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
1983
n/a
1984
n/a
1985
29.2 mm (1.1 in)
1986
15.1 mm (0.6 in)
1987
14.7 mm (0.6 in)
1988
17.8 mm (0.7 in)
1989
20.1 mm (0.8 in)
1990
21.0 mm (0.8 in)
1991
17.0 mm (0.7 in)
1992
30.2 mm (1.2 in)
1993
14.3 mm (0.6 in)
1994
27.2 mm (1.1 in)
1995
19.8 mm (0.8 in)
1996
17.5 mm (0.7 in)
1997
23.6 mm (0.9 in)
1998
10.2 mm (0.4 in)
1999
5.1 mm (0.20 in)
Longest dry spell (CDD)
The longest dry spell of the year at Prudhoe Bay, 1968 to 1999. The record is 127 days in 1998, marked on the chart; the median year is 66 days.
Longest dry spell (CDD) at Prudhoe Bay by year
Year
Longest dry spell (CDD)
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
1983
n/a
1984
n/a
1985
125 days
1986
84 days
1987
54 days
1988
72 days
1989
66 days
1990
94 days
1991
70 days
1992
60 days
1993
45 days
1994
90 days
1995
58 days
1996
38 days
1997
63 days
1998
127 days
1999
38 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Prudhoe Bay falls on 27 June and the median first autumn frost on 8 July, which leaves a median of 14 days between them.
Fitted over all years, the growing season changes by +8.6 days per decade at this station.
Frost dates and growing season at Prudhoe Bay
Measure
Median, all years
Earliest period
Recent period (1969 to 1998)
Recent against earliest
Fitted trend
Last spring frost
27 June
n/a
27 June
n/a
-2.2 days per decade
First autumn frost
8 July
n/a
8 July
n/a
+6.3 days per decade
Growing days
14 days
n/a
14 days
n/a
+8.6 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.
Download the Data
Data for Prudhoe Bay standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Prudhoe Bay 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.