Prudhoe Bay Weather Records (USC00507780)

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

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

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

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.

Days with data per year at Prudhoe Bay
Year	Days with data	Share of year	Complete
1968	29	8%	No
1969	353	97%	Yes
1970	351	96%	Yes
1971	359	98%	Yes
1972	350	96%	Yes
1973	357	98%	Yes
1974	358	98%	Yes
1975	350	96%	Yes
1976	355	97%	Yes
1977	351	96%	Yes
1978	359	98%	Yes
1979	353	97%	Yes
1980	351	96%	Yes
1981	354	97%	Yes
1982	354	97%	Yes
1983	349	96%	Yes
1984	359	98%	Yes
1985	355	97%	Yes
1986	361	99%	Yes
1987	365	100%	Yes
1988	364	99%	Yes
1989	363	99%	Yes
1990	365	100%	Yes
1991	363	99%	Yes
1992	366	100%	Yes
1993	364	100%	Yes
1994	364	100%	Yes
1995	364	100%	Yes
1996	360	98%	Yes
1997	361	99%	Yes
1998	361	99%	Yes
1999	161	44%	No

Latest Records

Latest records at Prudhoe Bay
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
16 May 1999	Prudhoe Bay, US	daily high min (Tie)	-1.1 C (30.0 F)	tie	5 years	1 of 100 (Routine)
15 May 1999	Prudhoe Bay, US	daily high min	0.0 C (32.0 F)	1.1 C (2.0 F)	2 years	4 of 100 (Routine)
14 May 1999	Prudhoe Bay, US	daily high max (Tie)	2.2 C (36.0 F)	tie	25 years	2 of 100 (Routine)
24 April 1999	Prudhoe Bay, US	daily low max (Tie)	-18.3 C (-0.9 F)	tie	24 years	2 of 100 (Routine)
1 April 1999	Prudhoe Bay, US	daily low min (Tie)	-37.2 C (-35.0 F)	tie	13 years	1 of 100 (Routine)
31 March 1999	Prudhoe Bay, US	daily low min	-41.7 C (-43.1 F)	2.8 C (5.0 F)	13 years	10 of 100 (Routine)
30 March 1999	Prudhoe Bay, US	daily low max	-31.7 C (-25.1 F)	1.7 C (3.1 F)	20 years	11 of 100 (Routine)
30 March 1999	Prudhoe Bay, US	daily low min (Tie)	-39.4 C (-38.9 F)	tie	20 years	2 of 100 (Routine)
29 March 1999	Prudhoe Bay, US	daily low max	-33.3 C (-27.9 F)	5.0 C (9.0 F)	26 years	17 of 100 (Routine)
29 March 1999	Prudhoe Bay, US	daily low min	-41.7 C (-43.1 F)	1.7 C (3.1 F)	12 years	8 of 100 (Routine)
28 March 1999	Prudhoe Bay, US	daily low min	-41.7 C (-43.1 F)	0.6 C (1.1 F)	12 years	6 of 100 (Routine)
28 March 1999	Prudhoe Bay, US	daily low max	-29.4 C (-20.9 F)	1.1 C (2.0 F)	1 year	4 of 100 (Routine)
24 January 1999	Prudhoe Bay, US	daily high max	-3.9 C (25.0 F)	8.9 C (16.0 F)	20 years	18 of 100 (Routine)

Climate Trend

30 complete years, 1969 to 1998

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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).