Guard Island Light STN Weather Records (USC00503454)

Record envelope, standing records and threshold days for Guard Island Light STN (USC00503454), Alaska, United States, with 30 years of record.

Key Facts for Guard Island Light STN

Guard Island Light STN (USC00503454) is a weather station in Alaska, United States at 55.45 latitude and -131.88 longitude, 6 m (20 ft) above sea level.
The station reports from 1940 to 1969, 30 years of record.
1,464 records set at Guard Island Light STN still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Alaska, United States, 55.45 latitude, -131.88 longitude.
Elevation: 6 m (20 ft).
Period of record: 1940 to 1969, 30 years.
Eligible elements: none yet.

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 Guard Island Light STN. 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 Guard Island Light STN, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-17.8 C (0.0 F)	n/a	n/a
Feb	13.9 C (57.0 F)	-15.0 C (5.0 F)	n/a	n/a
Mar	15.6 C (60.1 F)	-10.0 C (14.0 F)	n/a	n/a
Apr	19.4 C (66.9 F)	-6.1 C (21.0 F)	n/a	n/a
May	22.8 C (73.0 F)	-2.8 C (27.0 F)	n/a	n/a
Jun	27.2 C (81.0 F)	-1.7 C (28.9 F)	n/a	n/a
Jul	25.0 C (77.0 F)	-1.1 C (30.0 F)	n/a	n/a
Aug	26.7 C (80.1 F)	1.1 C (34.0 F)	n/a	n/a
Sep	23.3 C (73.9 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	16.7 C (62.1 F)	-1.7 C (28.9 F)	n/a	n/a
Nov	16.1 C (61.0 F)	-12.8 C (9.0 F)	n/a	n/a
Dec	12.8 C (55.0 F)	-16.1 C (3.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Guard Island Light STN still stand. 1956 holds the most, with 115.

Standing records at Guard Island Light STN by the year they were set
Year set	Standing records
1940	18
1941	60
1942	4
1943	24
1944	59
1945	42
1946	24
1947	57
1948	48
1949	78
1950	65
1951	43
1952	61
1953	43
1954	69
1955	85
1956	115
1957	35
1958	74
1959	65
1960	32
1961	36
1962	47
1963	71
1964	48
1965	43
1966	31
1967	30
1968	28
1969	29

Wettest Day of Each Month

Nov: 113.5 mm (4.5 in)

The wettest day on record for each calendar month at Guard Island Light STN. The most was 113.5 mm (4.5 in) on 16 November 1943.

Record daily precipitation for each month at Guard Island Light STN
Month	Record daily precipitation (mm)	Date
Jan	62.7 mm (2.5 in)	30 January 1960
Feb	52.3 mm (2.1 in)	8 February 1961
Mar	53.3 mm (2.1 in)	28 March 1966
Apr	40.6 mm (1.6 in)	4 April 1953
May	57.2 mm (2.3 in)	14 May 1958
Jun	31.0 mm (1.2 in)	27 June 1949
Jul	50.8 mm (2.0 in)	25 July 1948
Aug	80.0 mm (3.1 in)	31 August 1957
Sep	50.3 mm (2.0 in)	25 September 1952
Oct	68.6 mm (2.7 in)	14 October 1953
Nov	113.5 mm (4.5 in)	16 November 1943
Dec	45.7 mm (1.8 in)	28 December 1964

Period of Record Coverage

1940 to 1969

30 years of record at Guard Island Light STN, 1940 to 1969. 9 years have data for under 90 percent of days and are left out of rankings: 1940, 1941, 1942, 1943, 1944, 1945, 1947, 1968 and others.

Days with data per year at Guard Island Light STN
Year	Days with data	Share of year	Complete
1940	60	16%	No
1941	326	89%	No
1942	45	12%	No
1943	96	26%	No
1944	317	87%	No
1945	327	90%	No
1946	360	99%	Yes
1947	304	83%	No
1948	363	99%	Yes
1949	358	98%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	363	99%	Yes
1955	363	99%	Yes
1956	350	96%	Yes
1957	361	99%	Yes
1958	360	99%	Yes
1959	331	91%	Yes
1960	350	96%	Yes
1961	349	96%	Yes
1962	353	97%	Yes
1963	361	99%	Yes
1964	360	98%	Yes
1965	363	99%	Yes
1966	351	96%	Yes
1967	362	99%	Yes
1968	302	83%	No
1969	180	49%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

16 complete years, 1948 to 1967

One stripe for each of 16 complete years at Guard Island Light STN, 1948 to 1967. Blue stripes are years cooler than the station's own mean of 7.7 C (45.9 F); red stripes are warmer. The coolest year was 1955, at 6.3 C (43.4 F), and the warmest was 1958, at 8.8 C (47.8 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Guard Island Light STN as warming stripes, 1948 to 1967
Year	Annual mean temperature	Difference from the station mean
1948	7.3 C	-0.37 C
1949	7.0 C	-0.72 C
1950	6.7 C	-1.03 C
1951	7.4 C	-0.32 C
1952	7.9 C	+0.19 C
1953	8.6 C	+0.85 C
1954	7.3 C	-0.45 C
1955	6.3 C	-1.39 C
1957	7.8 C	+0.10 C
1958	8.8 C	+1.06 C
1960	8.3 C	+0.60 C
1961	8.4 C	+0.72 C
1962	8.1 C	+0.35 C
1963	8.3 C	+0.61 C
1964	7.2 C	-0.53 C
1967	8.1 C	+0.36 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

1940 to 1969

Yearly extremes at Guard Island Light STN: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	27.2 C (81.0 F)	1950	23.6 C (74.5 F)	30
Coldest night (TNn)	-17.8 C (0.0 F)	1947	-11.1 C (12.0 F)	30
Wettest day (Rx1day)	113.5 mm (4.5 in)	1943	47.0 mm (1.9 in)	30
Wettest five days (Rx5day)	189.7 mm (7.5 in)	1943	106.6 mm (4.2 in)	29
Longest dry spell (CDD)	25 days	1958	16 days	30

Hottest day (TXx)

The hottest day of the year at Guard Island Light STN, 1940 to 1969. The record is 27.2 C (81.0 F) in 1950, marked on the chart; the median year is 23.6 C (74.5 F).

Hottest day (TXx) at Guard Island Light STN by year
Year	Hottest day (TXx)
1940	11.7 C (53.1 F)
1941	23.9 C (75.0 F)
1942	17.8 C (64.0 F)
1943	15.0 C (59.0 F)
1944	21.7 C (71.1 F)
1945	21.7 C (71.1 F)
1946	21.7 C (71.1 F)
1947	22.2 C (72.0 F)
1948	23.9 C (75.0 F)
1949	23.9 C (75.0 F)
1950	27.2 C (81.0 F)
1951	24.4 C (75.9 F)
1952	25.0 C (77.0 F)
1953	26.7 C (80.1 F)
1954	25.0 C (77.0 F)
1955	22.8 C (73.0 F)
1956	23.9 C (75.0 F)
1957	25.6 C (78.1 F)
1958	24.4 C (75.9 F)
1959	24.4 C (75.9 F)
1960	23.9 C (75.0 F)
1961	23.9 C (75.0 F)
1962	22.2 C (72.0 F)
1963	22.2 C (72.0 F)
1964	20.0 C (68.0 F)
1965	23.3 C (73.9 F)
1966	23.3 C (73.9 F)
1967	23.9 C (75.0 F)
1968	22.2 C (72.0 F)
1969	23.3 C (73.9 F)

Coldest night (TNn)

The coldest night of the year at Guard Island Light STN, 1940 to 1969. The record is -17.8 C (0.0 F) in 1947, marked on the chart; the median year is -11.1 C (12.0 F).

Coldest night (TNn) at Guard Island Light STN by year
Year	Coldest night (TNn)
1940	-5.6 C (21.9 F)
1941	-8.9 C (16.0 F)
1942	-0.6 C (30.9 F)
1943	1.7 C (35.1 F)
1944	-2.8 C (27.0 F)
1945	-5.6 C (21.9 F)
1946	-6.1 C (21.0 F)
1947	-17.8 C (0.0 F)
1948	-12.8 C (9.0 F)
1949	-15.6 C (3.9 F)
1950	-16.1 C (3.0 F)
1951	-11.1 C (12.0 F)
1952	-11.7 C (10.9 F)
1953	-17.2 C (1.0 F)
1954	-12.8 C (9.0 F)
1955	-12.8 C (9.0 F)
1956	-13.3 C (8.1 F)
1957	-12.8 C (9.0 F)
1958	-5.6 C (21.9 F)
1959	-10.0 C (14.0 F)
1960	-2.2 C (28.0 F)
1961	-4.4 C (24.1 F)
1962	-6.7 C (19.9 F)
1963	-11.1 C (12.0 F)
1964	-16.1 C (3.0 F)
1965	-11.7 C (10.9 F)
1966	-12.8 C (9.0 F)
1967	-8.9 C (16.0 F)
1968	-15.0 C (5.0 F)
1969	-10.6 C (12.9 F)

Wettest day (Rx1day)

The wettest day of the year at Guard Island Light STN, 1940 to 1969. The record is 113.5 mm (4.5 in) in 1943, marked on the chart; the median year is 47.0 mm (1.9 in).

Wettest day (Rx1day) at Guard Island Light STN by year
Year	Wettest day (Rx1day)
1940	33.5 mm (1.3 in)
1941	34.0 mm (1.3 in)
1942	19.1 mm (0.8 in)
1943	113.5 mm (4.5 in)
1944	48.5 mm (1.9 in)
1945	30.2 mm (1.2 in)
1946	34.5 mm (1.4 in)
1947	2.0 mm (0.08 in)
1948	50.8 mm (2.0 in)
1949	37.1 mm (1.5 in)
1950	68.8 mm (2.7 in)
1951	45.7 mm (1.8 in)
1952	50.3 mm (2.0 in)
1953	68.6 mm (2.7 in)
1954	38.9 mm (1.5 in)
1955	42.9 mm (1.7 in)
1956	43.7 mm (1.7 in)
1957	80.0 mm (3.1 in)
1958	57.2 mm (2.3 in)
1959	50.8 mm (2.0 in)
1960	62.7 mm (2.5 in)
1961	52.3 mm (2.1 in)
1962	30.5 mm (1.2 in)
1963	34.3 mm (1.4 in)
1964	48.3 mm (1.9 in)
1965	56.9 mm (2.2 in)
1966	66.3 mm (2.6 in)
1967	42.9 mm (1.7 in)
1968	54.9 mm (2.2 in)
1969	19.1 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Guard Island Light STN, 1940 to 1969. The record is 189.7 mm (7.5 in) in 1943, marked on the chart; the median year is 106.6 mm (4.2 in).

Wettest five days (Rx5day) at Guard Island Light STN by year
Year	Wettest five days (Rx5day)
1940	100.5 mm (4.0 in)
1941	90.1 mm (3.5 in)
1942	39.8 mm (1.6 in)
1943	189.7 mm (7.5 in)
1944	132.8 mm (5.2 in)
1945	88.5 mm (3.5 in)
1946	97.5 mm (3.8 in)
1947	n/a
1948	94.0 mm (3.7 in)
1949	98.3 mm (3.9 in)
1950	115.6 mm (4.6 in)
1951	92.5 mm (3.6 in)
1952	113.5 mm (4.5 in)
1953	142.5 mm (5.6 in)
1954	130.8 mm (5.1 in)
1955	81.0 mm (3.2 in)
1956	83.4 mm (3.3 in)
1957	135.4 mm (5.3 in)
1958	139.5 mm (5.5 in)
1959	111.4 mm (4.4 in)
1960	127.8 mm (5.0 in)
1961	114.8 mm (4.5 in)
1962	70.1 mm (2.8 in)
1963	84.0 mm (3.3 in)
1964	116.9 mm (4.6 in)
1965	95.8 mm (3.8 in)
1966	138.2 mm (5.4 in)
1967	107.6 mm (4.2 in)
1968	106.6 mm (4.2 in)
1969	46.0 mm (1.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Guard Island Light STN, 1940 to 1969. The record is 25 days in 1958, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Guard Island Light STN by year
Year	Longest dry spell (CDD)
1940	7 days
1941	19 days
1942	16 days
1943	9 days
1944	15 days
1945	18 days
1946	12 days
1947	1 day
1948	15 days
1949	16 days
1950	18 days
1951	16 days
1952	22 days
1953	12 days
1954	13 days
1955	18 days
1956	16 days
1957	22 days
1958	25 days
1959	11 days
1960	19 days
1961	16 days
1962	24 days
1963	12 days
1964	14 days
1965	21 days
1966	16 days
1967	10 days
1968	12 days
1969	24 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 Guard Island Light STN standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Guard Island Light STN 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.

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