Attu Weather Records (USC00500452)

Record envelope, standing records and threshold days for Attu (USC00500452), Alaska, United States, with 77 years of record.

Key Facts for Attu

Attu (USC00500452) is a weather station in Alaska, United States at 52.83 latitude and 173.18 longitude, 21 m (70 ft) above sea level.
The station reports from 1917 to 1993, 77 years of record.
1,464 records set at Attu still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Attu tied a daily record low minimum temperature of 0.0 C (32.0 F) on 30 August 1993.

About the Station

Location: Alaska, United States, 52.83 latitude, 173.18 longitude.
Elevation: 21 m (70 ft).
Period of record: 1917 to 1993, 77 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

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 Attu. 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 Attu, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	9.4 C (48.9 F)	-15.0 C (5.0 F)	n/a	n/a
Feb	10.6 C (51.1 F)	-13.9 C (7.0 F)	n/a	n/a
Mar	10.6 C (51.1 F)	-15.6 C (3.9 F)	n/a	n/a
Apr	11.7 C (53.1 F)	-11.1 C (12.0 F)	n/a	n/a
May	15.0 C (59.0 F)	-9.4 C (15.1 F)	n/a	n/a
Jun	17.8 C (64.0 F)	-5.0 C (23.0 F)	n/a	n/a
Jul	25.0 C (77.0 F)	-2.8 C (27.0 F)	n/a	n/a
Aug	25.0 C (77.0 F)	-2.2 C (28.0 F)	n/a	n/a
Sep	20.0 C (68.0 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	16.1 C (61.0 F)	-7.2 C (19.0 F)	n/a	n/a
Nov	12.2 C (54.0 F)	-11.1 C (12.0 F)	n/a	n/a
Dec	9.4 C (48.9 F)	-16.7 C (1.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Attu still stand. 1989 holds the most, with 90.

Standing records at Attu by the year they were set
Year set	Standing records
1917	79
1918	9
1919	9
1920	63
1921	35
1938	5
1939	5
1941	12
1942	8
1946	28
1947	18
1948	38
1949	1
1950	39
1951	5
1954	9
1955	39
1956	46
1957	18
1958	16
1961	26
1962	28
1963	30
1964	37
1965	20
1966	17
1967	7
1968	28
1969	29
1970	21
1971	31
1972	23
1973	18
1974	16
1975	54
1976	30
1977	31
1978	15
1979	32
1980	51
1981	32
1982	59
1983	22
1984	13
1985	48
1986	23
1987	24
1988	26
1989	90
1992	77
1993	24

All-Time Record Progression

2 new records

2 all-time records were set at Attu between 8 August 1989 and 23 August 1989. Each dot is a new record.

When Attu set new all-time records
Date	Kind	Detail
1989-08-08	Record high minimum temperature	Record high minimum temperature 15.0 C (59.0 F)
1989-08-23	Record high minimum temperature	Record high minimum temperature 16.1 C (61.0 F)

Wettest Day of Each Month

Jul: 228.6 mm (9.0 in)

The wettest day on record for each calendar month at Attu. The most was 228.6 mm (9.0 in) on 31 July 1969.

Record daily precipitation for each month at Attu
Month	Record daily precipitation (mm)	Date
Jan	63.5 mm (2.5 in)	4 January 1984
Feb	91.9 mm (3.6 in)	18 February 1965
Mar	96.3 mm (3.8 in)	27 March 1942
Apr	88.9 mm (3.5 in)	24 April 1988
May	59.4 mm (2.3 in)	31 May 1950
Jun	114.8 mm (4.5 in)	28 June 1961
Jul	228.6 mm (9.0 in)	31 July 1969
Aug	170.9 mm (6.7 in)	28 August 1954
Sep	116.6 mm (4.6 in)	10 September 1985
Oct	109.2 mm (4.3 in)	8 October 1973
Nov	101.6 mm (4.0 in)	29 November 1983
Dec	86.4 mm (3.4 in)	20 December 1970

Period of Record Coverage

1917 to 1993

51 years of record at Attu, 1917 to 1993. 35 years have data for under 90 percent of days and are left out of rankings: 1917, 1918, 1919, 1920, 1921, 1938, 1939, 1941 and others.

Days with data per year at Attu
Year	Days with data	Share of year	Complete
1917	184	50%	No
1918	118	32%	No
1919	103	28%	No
1920	295	81%	No
1921	181	50%	No
1938	24	7%	No
1939	49	13%	No
1941	102	28%	No
1942	81	22%	No
1946	182	50%	No
1947	273	75%	No
1948	365	100%	Yes
1949	61	17%	No
1950	305	84%	No
1951	31	8%	No
1954	151	41%	No
1955	330	90%	Yes
1956	366	100%	Yes
1957	362	99%	Yes
1958	166	45%	No
1961	334	92%	Yes
1962	346	95%	Yes
1963	355	97%	Yes
1964	363	99%	Yes
1965	360	99%	Yes
1966	363	99%	Yes
1967	358	98%	Yes
1968	357	98%	Yes
1969	350	96%	Yes
1970	350	96%	Yes
1971	316	87%	No
1972	322	88%	No
1973	358	98%	Yes
1974	267	73%	No
1975	275	75%	No
1976	276	75%	No
1977	214	59%	No
1978	304	83%	No
1979	185	51%	No
1980	300	82%	No
1981	271	74%	No
1982	317	87%	No
1983	267	73%	No
1984	179	49%	No
1985	340	93%	Yes
1986	296	81%	No
1987	208	57%	No
1988	329	90%	No
1989	328	90%	No
1992	206	56%	No
1993	167	46%	No

Latest Records

Latest records at Attu
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 August 1993	Attu, US	daily low min (Tie)	0.0 C (32.0 F)	tie	0 years	1 of 100 (Routine)
26 August 1993	Attu, US	daily high min (Tie)	10.6 C (51.1 F)	tie	15 years	2 of 100 (Routine)
25 August 1993	Attu, US	daily high min	11.1 C (52.0 F)	0.5 C (0.9 F)	24 years	15 of 100 (Routine)
22 June 1993	Attu, US	daily rain	14.7 mm (0.6 in)	8.1 mm (0.32 in)	35 years	20 of 100 (Routine)
21 June 1993	Attu, US	daily rain	12.7 mm (0.5 in)	6.9 mm (0.27 in)	8 years	14 of 100 (Routine)
7 June 1993	Attu, US	daily high max	15.6 C (60.1 F)	2.8 C (5.0 F)	12 years	21 of 100 (Routine)
7 June 1993	Attu, US	daily high min	7.2 C (45.0 F)	0.5 C (0.9 F)	14 years	13 of 100 (Routine)
6 June 1993	Attu, US	daily high max	16.7 C (62.1 F)	3.9 C (7.0 F)	12 years	25 of 100 (Routine)
6 June 1993	Attu, US	daily high min	8.3 C (46.9 F)	0.5 C (0.9 F)	14 years	13 of 100 (Routine)
5 June 1993	Attu, US	daily high max	15.6 C (60.1 F)	3.4 C (6.1 F)	12 years	23 of 100 (Routine)
20 March 1993	Attu, US	daily high max	5.6 C (42.1 F)	0.6 C (1.1 F)	72 years	30 of 100 (Routine)
5 March 1993	Attu, US	daily low min	-7.8 C (18.0 F)	0.6 C (1.1 F)	72 years	30 of 100 (Routine)
3 March 1993	Attu, US	daily low min (Tie)	-7.8 C (18.0 F)	tie	43 years	4 of 100 (Routine)
19 February 1993	Attu, US	daily high min	2.2 C (36.0 F)	0.5 C (0.9 F)	37 years	19 of 100 (Routine)
19 February 1993	Attu, US	daily high max (Tie)	4.4 C (39.9 F)	tie	27 years	3 of 100 (Routine)
19 January 1993	Attu, US	daily low min (Tie)	-12.2 C (10.0 F)	tie	6 years	2 of 100 (Routine)
18 January 1993	Attu, US	daily low min	-10.6 C (12.9 F)	0.6 C (1.1 F)	6 years	9 of 100 (Routine)
16 January 1993	Attu, US	daily low min (Tie)	-12.2 C (10.0 F)	tie	18 years	3 of 100 (Routine)
13 January 1993	Attu, US	daily low min	-13.3 C (8.1 F)	1.1 C (2.0 F)	6 years	11 of 100 (Routine)
12 January 1993	Attu, US	daily low min	-12.8 C (9.0 F)	2.2 C (4.0 F)	7 years	15 of 100 (Routine)

Climate Trend

14 complete years, 1948 to 1985

One stripe for each of 14 complete years at Attu, 1948 to 1985. Blue stripes are years cooler than the station's own mean of 3.9 C (39.0 F); red stripes are warmer. The coolest year was 1964, at 3.2 C (37.8 F), and the warmest was 1963, at 4.6 C (40.3 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Attu as warming stripes, 1948 to 1985
Year	Annual mean temperature	Difference from the station mean
1948	4.1 C	+0.24 C
1956	4.2 C	+0.34 C
1957	3.9 C	-0.01 C
1962	4.4 C	+0.48 C
1963	4.6 C	+0.71 C
1964	3.2 C	-0.69 C
1965	4.1 C	+0.23 C
1966	3.8 C	-0.14 C
1967	4.0 C	+0.08 C
1968	3.9 C	+0.01 C
1969	4.0 C	+0.07 C
1970	3.6 C	-0.27 C
1973	3.4 C	-0.48 C
1985	3.3 C	-0.59 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

1917 to 1993

Yearly extremes at Attu: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	25.0 C (77.0 F)	1920	17.8 C (64.0 F)	51
Coldest night (TNn)	-16.7 C (1.9 F)	1971	-9.4 C (15.1 F)	51
Wettest day (Rx1day)	228.6 mm (9.0 in)	1969	60.0 mm (2.4 in)	52
Wettest five days (Rx5day)	333.4 mm (13.1 in)	1969	109.9 mm (4.3 in)	52
Longest dry spell (CDD)	101 days	1967	12 days	52

Hottest day (TXx)

The hottest day of the year at Attu, 1917 to 1993. The record is 25.0 C (77.0 F) in 1920, marked on the chart; the median year is 17.8 C (64.0 F).

Hottest day (TXx) at Attu by year
Year	Hottest day (TXx)
1917	18.9 C (66.0 F)
1918	7.8 C (46.0 F)
1919	13.3 C (55.9 F)
1920	25.0 C (77.0 F)
1921	14.4 C (57.9 F)
1938	23.9 C (75.0 F)
1939	21.7 C (71.1 F)
1940	n/a
1941	14.4 C (57.9 F)
1942	10.6 C (51.1 F)
1946	25.0 C (77.0 F)
1947	14.4 C (57.9 F)
1948	18.9 C (66.0 F)
1949	13.9 C (57.0 F)
1950	21.1 C (70.0 F)
1951	4.4 C (39.9 F)
1954	16.7 C (62.1 F)
1955	20.0 C (68.0 F)
1956	18.9 C (66.0 F)
1957	16.7 C (62.1 F)
1958	11.7 C (53.1 F)
1961	15.6 C (60.1 F)
1962	16.7 C (62.1 F)
1963	17.8 C (64.0 F)
1964	17.8 C (64.0 F)
1965	15.6 C (60.1 F)
1966	20.0 C (68.0 F)
1967	17.2 C (63.0 F)
1968	16.1 C (61.0 F)
1969	17.8 C (64.0 F)
1970	16.7 C (62.1 F)
1971	17.8 C (64.0 F)
1972	20.0 C (68.0 F)
1973	16.7 C (62.1 F)
1974	18.3 C (64.9 F)
1975	17.2 C (63.0 F)
1976	15.0 C (59.0 F)
1977	20.6 C (69.1 F)
1978	21.7 C (71.1 F)
1979	17.8 C (64.0 F)
1980	20.6 C (69.1 F)
1981	19.4 C (66.9 F)
1982	18.3 C (64.9 F)
1983	21.1 C (70.0 F)
1984	12.8 C (55.0 F)
1985	22.2 C (72.0 F)
1986	19.4 C (66.9 F)
1987	16.7 C (62.1 F)
1988	18.9 C (66.0 F)
1989	20.0 C (68.0 F)
1992	15.0 C (59.0 F)
1993	16.7 C (62.1 F)

Coldest night (TNn)

The coldest night of the year at Attu, 1917 to 1993. The record is -16.7 C (1.9 F) in 1971, marked on the chart; the median year is -9.4 C (15.1 F).

Coldest night (TNn) at Attu by year
Year	Coldest night (TNn)
1917	-7.2 C (19.0 F)
1918	-7.8 C (18.0 F)
1919	-11.1 C (12.0 F)
1920	-11.1 C (12.0 F)
1921	-10.0 C (14.0 F)
1938	2.2 C (36.0 F)
1939	1.7 C (35.1 F)
1940	n/a
1941	-11.1 C (12.0 F)
1942	-12.2 C (10.0 F)
1946	-9.4 C (15.1 F)
1947	-8.9 C (16.0 F)
1948	-8.3 C (17.1 F)
1949	0.0 C (32.0 F)
1950	-7.8 C (18.0 F)
1951	-8.3 C (17.1 F)
1954	-7.2 C (19.0 F)
1955	-8.9 C (16.0 F)
1956	-7.2 C (19.0 F)
1957	-8.3 C (17.1 F)
1958	-7.8 C (18.0 F)
1961	-9.4 C (15.1 F)
1962	-6.7 C (19.9 F)
1963	-8.9 C (16.0 F)
1964	-9.4 C (15.1 F)
1965	-7.2 C (19.0 F)
1966	-8.9 C (16.0 F)
1967	-8.9 C (16.0 F)
1968	-6.1 C (21.0 F)
1969	-7.2 C (19.0 F)
1970	-7.8 C (18.0 F)
1971	-16.7 C (1.9 F)
1972	-9.4 C (15.1 F)
1973	-11.7 C (10.9 F)
1974	-11.7 C (10.9 F)
1975	-15.0 C (5.0 F)
1976	-7.2 C (19.0 F)
1977	-13.9 C (7.0 F)
1978	-10.0 C (14.0 F)
1979	-6.7 C (19.9 F)
1980	-9.4 C (15.1 F)
1981	-9.4 C (15.1 F)
1982	-11.1 C (12.0 F)
1983	-9.4 C (15.1 F)
1984	-16.1 C (3.0 F)
1985	-15.6 C (3.9 F)
1986	-12.2 C (10.0 F)
1987	-12.8 C (9.0 F)
1988	-13.9 C (7.0 F)
1989	-9.4 C (15.1 F)
1992	-8.9 C (16.0 F)
1993	-15.0 C (5.0 F)

Wettest day (Rx1day)

The wettest day of the year at Attu, 1917 to 1993. The record is 228.6 mm (9.0 in) in 1969, marked on the chart; the median year is 60.0 mm (2.4 in).

Wettest day (Rx1day) at Attu by year
Year	Wettest day (Rx1day)
1917	76.2 mm (3.0 in)
1918	71.1 mm (2.8 in)
1919	67.8 mm (2.7 in)
1920	62.5 mm (2.5 in)
1921	71.4 mm (2.8 in)
1938	82.6 mm (3.3 in)
1939	22.9 mm (0.9 in)
1940	14.2 mm (0.6 in)
1941	72.6 mm (2.9 in)
1942	96.3 mm (3.8 in)
1946	41.7 mm (1.6 in)
1947	45.2 mm (1.8 in)
1948	53.6 mm (2.1 in)
1949	29.5 mm (1.2 in)
1950	95.5 mm (3.8 in)
1951	10.4 mm (0.4 in)
1954	170.9 mm (6.7 in)
1955	69.3 mm (2.7 in)
1956	49.0 mm (1.9 in)
1957	39.9 mm (1.6 in)
1958	58.4 mm (2.3 in)
1961	114.8 mm (4.5 in)
1962	37.8 mm (1.5 in)
1963	50.8 mm (2.0 in)
1964	30.2 mm (1.2 in)
1965	91.9 mm (3.6 in)
1966	58.4 mm (2.3 in)
1967	62.2 mm (2.4 in)
1968	61.0 mm (2.4 in)
1969	228.6 mm (9.0 in)
1970	86.4 mm (3.4 in)
1971	81.3 mm (3.2 in)
1972	51.6 mm (2.0 in)
1973	109.2 mm (4.3 in)
1974	42.7 mm (1.7 in)
1975	31.8 mm (1.3 in)
1976	41.4 mm (1.6 in)
1977	34.5 mm (1.4 in)
1978	91.9 mm (3.6 in)
1979	76.2 mm (3.0 in)
1980	53.3 mm (2.1 in)
1981	30.5 mm (1.2 in)
1982	30.5 mm (1.2 in)
1983	101.6 mm (4.0 in)
1984	63.5 mm (2.5 in)
1985	116.6 mm (4.6 in)
1986	58.9 mm (2.3 in)
1987	61.2 mm (2.4 in)
1988	88.9 mm (3.5 in)
1989	20.6 mm (0.8 in)
1992	53.8 mm (2.1 in)
1993	25.4 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Attu, 1917 to 1993. The record is 333.4 mm (13.1 in) in 1969, marked on the chart; the median year is 109.9 mm (4.3 in).

Wettest five days (Rx5day) at Attu by year
Year	Wettest five days (Rx5day)
1917	132.7 mm (5.2 in)
1918	113.9 mm (4.5 in)
1919	93.4 mm (3.7 in)
1920	88.5 mm (3.5 in)
1921	139.2 mm (5.5 in)
1938	90.5 mm (3.6 in)
1939	38.1 mm (1.5 in)
1940	14.2 mm (0.6 in)
1941	189.0 mm (7.4 in)
1942	141.3 mm (5.6 in)
1946	127.0 mm (5.0 in)
1947	112.3 mm (4.4 in)
1948	131.3 mm (5.2 in)
1949	69.1 mm (2.7 in)
1950	119.9 mm (4.7 in)
1951	39.1 mm (1.5 in)
1954	197.3 mm (7.8 in)
1955	132.3 mm (5.2 in)
1956	123.5 mm (4.9 in)
1957	72.4 mm (2.9 in)
1958	70.6 mm (2.8 in)
1961	165.9 mm (6.5 in)
1962	82.1 mm (3.2 in)
1963	109.2 mm (4.3 in)
1964	61.6 mm (2.4 in)
1965	230.5 mm (9.1 in)
1966	88.8 mm (3.5 in)
1967	80.2 mm (3.2 in)
1968	86.4 mm (3.4 in)
1969	333.4 mm (13.1 in)
1970	222.6 mm (8.8 in)
1971	110.5 mm (4.4 in)
1972	89.2 mm (3.5 in)
1973	172.4 mm (6.8 in)
1974	94.3 mm (3.7 in)
1975	55.4 mm (2.2 in)
1976	107.6 mm (4.2 in)
1977	77.7 mm (3.1 in)
1978	136.3 mm (5.4 in)
1979	192.6 mm (7.6 in)
1980	101.5 mm (4.0 in)
1981	61.0 mm (2.4 in)
1982	43.2 mm (1.7 in)
1983	211.5 mm (8.3 in)
1984	158.7 mm (6.2 in)
1985	145.8 mm (5.7 in)
1986	143.2 mm (5.6 in)
1987	131.6 mm (5.2 in)
1988	125.0 mm (4.9 in)
1989	53.3 mm (2.1 in)
1992	95.0 mm (3.7 in)
1993	49.0 mm (1.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Attu, 1917 to 1993. The record is 101 days in 1967, marked on the chart; the median year is 12 days.

Longest dry spell (CDD) at Attu by year
Year	Longest dry spell (CDD)
1917	5 days
1918	11 days
1919	11 days
1920	20 days
1921	11 days
1938	5 days
1939	11 days
1940	10 days
1941	21 days
1942	5 days
1946	7 days
1947	8 days
1948	13 days
1949	5 days
1950	8 days
1951	5 days
1954	4 days
1955	12 days
1956	17 days
1957	9 days
1958	10 days
1961	14 days
1962	10 days
1963	13 days
1964	13 days
1965	10 days
1966	12 days
1967	101 days
1968	71 days
1969	35 days
1970	41 days
1971	18 days
1972	11 days
1973	37 days
1974	25 days
1975	12 days
1976	9 days
1977	21 days
1978	10 days
1979	17 days
1980	22 days
1981	29 days
1982	21 days
1983	23 days
1984	13 days
1985	11 days
1986	15 days
1987	19 days
1988	11 days
1989	27 days
1992	12 days
1993	30 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.

Download the Data

Data for Attu standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Attu 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 2026-10-15 (15 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).