Flat Weather Records (USC00503085)

Record envelope, standing records and threshold days for Flat (USC00503085), Alaska, United States, with 30 years of record.

Key Facts for Flat

Flat (USC00503085) is a weather station in Alaska, United States at 62.45 latitude and -158.00 longitude, 99 m (325 ft) above sea level.
The station reports from 1932 to 1961, 30 years of record.
1,464 records set at Flat 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, 62.45 latitude, -158.00 longitude.
Elevation: 99 m (325 ft).
Period of record: 1932 to 1961, 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 Flat. 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 Flat, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	7.2 C (45.0 F)	-51.7 C (-61.1 F)	n/a	n/a
Feb	8.3 C (46.9 F)	-50.6 C (-59.1 F)	n/a	n/a
Mar	10.0 C (50.0 F)	-45.6 C (-50.1 F)	n/a	n/a
Apr	17.2 C (63.0 F)	-38.9 C (-38.0 F)	n/a	n/a
May	25.6 C (78.1 F)	-20.6 C (-5.1 F)	n/a	n/a
Jun	31.1 C (88.0 F)	-4.4 C (24.1 F)	n/a	n/a
Jul	32.2 C (90.0 F)	-2.2 C (28.0 F)	n/a	n/a
Aug	27.8 C (82.0 F)	-6.7 C (19.9 F)	n/a	n/a
Sep	22.2 C (72.0 F)	-13.3 C (8.1 F)	n/a	n/a
Oct	16.7 C (62.1 F)	-30.0 C (-22.0 F)	n/a	n/a
Nov	15.0 C (59.0 F)	-43.9 C (-47.0 F)	n/a	n/a
Dec	9.4 C (48.9 F)	-50.6 C (-59.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Flat still stand. 1933 holds the most, with 115.

Standing records at Flat by the year they were set
Year set	Standing records
1932	49
1933	115
1935	20
1936	62
1937	59
1938	50
1939	42
1940	54
1941	35
1942	63
1943	56
1944	57
1945	35
1946	44
1947	82
1948	74
1949	13
1950	36
1951	47
1952	47
1953	45
1954	52
1955	46
1956	80
1957	75
1958	35
1959	49
1960	40
1961	2

Wettest Day of Each Month

Jun: 69.3 mm (2.7 in)

The wettest day on record for each calendar month at Flat. The most was 69.3 mm (2.7 in) on 21 June 1950.

Record daily precipitation for each month at Flat
Month	Record daily precipitation (mm)	Date
Jan	13.0 mm (0.5 in)	31 January 1940
Feb	25.1 mm (1.0 in)	27 February 1945
Mar	12.7 mm (0.5 in)	27 March 1948
Apr	11.7 mm (0.5 in)	17 April 1939
May	15.5 mm (0.6 in)	6 May 1942
Jun	69.3 mm (2.7 in)	21 June 1950
Jul	21.6 mm (0.9 in)	30 July 1954
Aug	33.0 mm (1.3 in)	26 August 1959
Sep	26.9 mm (1.1 in)	20 September 1942
Oct	24.1 mm (0.9 in)	27 October 1941
Nov	17.5 mm (0.7 in)	19 November 1949
Dec	10.9 mm (0.4 in)	11 December 1944

Period of Record Coverage

1932 to 1961

29 years of record at Flat, 1932 to 1961. 7 years have data for under 90 percent of days and are left out of rankings: 1932, 1933, 1935, 1945, 1949, 1960, 1961.

Days with data per year at Flat
Year	Days with data	Share of year	Complete
1932	140	38%	No
1933	301	82%	No
1935	89	24%	No
1936	365	100%	Yes
1937	362	99%	Yes
1938	364	100%	Yes
1939	364	100%	Yes
1940	363	99%	Yes
1941	360	99%	Yes
1942	355	97%	Yes
1943	336	92%	Yes
1944	340	93%	Yes
1945	324	89%	No
1946	349	96%	Yes
1947	361	99%	Yes
1948	361	99%	Yes
1949	101	28%	No
1950	344	94%	Yes
1951	359	98%	Yes
1952	366	100%	Yes
1953	361	99%	Yes
1954	362	99%	Yes
1955	358	98%	Yes
1956	364	99%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	304	83%	No
1961	43	12%	No

Latest Records

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

Climate Trend

21 complete years, 1936 to 1959

One stripe for each of 21 complete years at Flat, 1936 to 1959. Blue stripes are years cooler than the station's own mean of -2.6 C (27.4 F); red stripes are warmer. The coolest year was 1956, at -6.0 C (21.1 F), and the warmest was 1940, at -0.2 C (31.6 F). The strongest colour marks a difference of 3.5 C (6.3 F).

Annual mean temperature at Flat as warming stripes, 1936 to 1959
Year	Annual mean temperature	Difference from the station mean
1936	-2.1 C	+0.43 C
1937	-1.8 C	+0.79 C
1938	-2.1 C	+0.41 C
1939	-4.3 C	-1.77 C
1940	-0.2 C	+2.32 C
1941	-1.4 C	+1.12 C
1942	-1.1 C	+1.42 C
1943	-1.6 C	+0.92 C
1944	-1.4 C	+1.16 C
1946	-3.2 C	-0.68 C
1947	-3.1 C	-0.53 C
1948	-2.9 C	-0.36 C
1951	-2.2 C	+0.33 C
1952	-3.1 C	-0.57 C
1953	-2.2 C	+0.38 C
1954	-3.6 C	-1.08 C
1955	-4.0 C	-1.44 C
1956	-6.0 C	-3.48 C
1957	-0.7 C	+1.84 C
1958	-2.2 C	+0.33 C
1959	-4.1 C	-1.54 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

1932 to 1961

Yearly extremes at Flat: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	32.2 C (90.0 F)	1951	28.9 C (84.0 F)	29
Coldest night (TNn)	-51.7 C (-61.1 F)	1947	-45.0 C (-49.0 F)	29
Wettest day (Rx1day)	69.3 mm (2.7 in)	1950	23.0 mm (0.9 in)	28
Wettest five days (Rx5day)	87.1 mm (3.4 in)	1950	42.9 mm (1.7 in)	28
Longest dry spell (CDD)	70 days	1957	31 days	28

Hottest day (TXx)

The hottest day of the year at Flat, 1932 to 1961. The record is 32.2 C (90.0 F) in 1951, marked on the chart; the median year is 28.9 C (84.0 F).

Hottest day (TXx) at Flat by year
Year	Hottest day (TXx)
1932	20.0 C (68.0 F)
1933	27.2 C (81.0 F)
1935	11.1 C (52.0 F)
1936	30.0 C (86.0 F)
1937	30.6 C (87.1 F)
1938	29.4 C (84.9 F)
1939	27.8 C (82.0 F)
1940	25.6 C (78.1 F)
1941	28.3 C (82.9 F)
1942	28.9 C (84.0 F)
1943	29.4 C (84.9 F)
1944	30.6 C (87.1 F)
1945	23.9 C (75.0 F)
1946	26.1 C (79.0 F)
1947	27.8 C (82.0 F)
1948	27.8 C (82.0 F)
1949	10.6 C (51.1 F)
1950	29.4 C (84.9 F)
1951	32.2 C (90.0 F)
1952	30.6 C (87.1 F)
1953	31.1 C (88.0 F)
1954	26.7 C (80.1 F)
1955	29.4 C (84.9 F)
1956	29.4 C (84.9 F)
1957	31.1 C (88.0 F)
1958	26.7 C (80.1 F)
1959	29.4 C (84.9 F)
1960	30.6 C (87.1 F)
1961	20.0 C (68.0 F)

Coldest night (TNn)

The coldest night of the year at Flat, 1932 to 1961. The record is -51.7 C (-61.1 F) in 1947, marked on the chart; the median year is -45.0 C (-49.0 F).

Coldest night (TNn) at Flat by year
Year	Coldest night (TNn)
1932	-38.9 C (-38.0 F)
1933	-50.0 C (-58.0 F)
1935	-39.4 C (-38.9 F)
1936	-45.6 C (-50.1 F)
1937	-41.1 C (-42.0 F)
1938	-42.8 C (-45.0 F)
1939	-47.8 C (-54.0 F)
1940	-43.3 C (-45.9 F)
1941	-41.1 C (-42.0 F)
1942	-42.2 C (-44.0 F)
1943	-44.4 C (-47.9 F)
1944	-43.3 C (-45.9 F)
1945	-42.8 C (-45.0 F)
1946	-50.6 C (-59.1 F)
1947	-51.7 C (-61.1 F)
1948	-45.0 C (-49.0 F)
1949	-45.0 C (-49.0 F)
1950	-39.4 C (-38.9 F)
1951	-48.9 C (-56.0 F)
1952	-46.1 C (-51.0 F)
1953	-46.7 C (-52.1 F)
1954	-46.7 C (-52.1 F)
1955	-47.2 C (-53.0 F)
1956	-46.7 C (-52.1 F)
1957	-46.7 C (-52.1 F)
1958	-41.1 C (-42.0 F)
1959	-42.8 C (-45.0 F)
1960	-46.7 C (-52.1 F)
1961	-30.0 C (-22.0 F)

Wettest day (Rx1day)

The wettest day of the year at Flat, 1932 to 1961. The record is 69.3 mm (2.7 in) in 1950, marked on the chart; the median year is 23.0 mm (0.9 in).

Wettest day (Rx1day) at Flat by year
Year	Wettest day (Rx1day)
1932	n/a
1933	26.7 mm (1.1 in)
1935	0.0 mm (0.00 in)
1936	19.1 mm (0.8 in)
1937	19.3 mm (0.8 in)
1938	21.3 mm (0.8 in)
1939	17.0 mm (0.7 in)
1940	19.1 mm (0.8 in)
1941	25.9 mm (1.0 in)
1942	26.9 mm (1.1 in)
1943	23.1 mm (0.9 in)
1944	25.1 mm (1.0 in)
1945	25.1 mm (1.0 in)
1946	20.8 mm (0.8 in)
1947	24.1 mm (0.9 in)
1948	12.7 mm (0.5 in)
1949	17.5 mm (0.7 in)
1950	69.3 mm (2.7 in)
1951	16.0 mm (0.6 in)
1952	30.0 mm (1.2 in)
1953	26.4 mm (1.0 in)
1954	22.9 mm (0.9 in)
1955	23.6 mm (0.9 in)
1956	30.5 mm (1.2 in)
1957	16.0 mm (0.6 in)
1958	24.1 mm (0.9 in)
1959	33.0 mm (1.3 in)
1960	9.7 mm (0.38 in)
1961	6.1 mm (0.24 in)

Wettest five days (Rx5day)

The wettest five days of the year at Flat, 1932 to 1961. The record is 87.1 mm (3.4 in) in 1950, marked on the chart; the median year is 42.9 mm (1.7 in).

Wettest five days (Rx5day) at Flat by year
Year	Wettest five days (Rx5day)
1932	n/a
1933	56.8 mm (2.2 in)
1935	0.0 mm (0.00 in)
1936	33.5 mm (1.3 in)
1937	37.1 mm (1.5 in)
1938	50.7 mm (2.0 in)
1939	47.6 mm (1.9 in)
1940	41.2 mm (1.6 in)
1941	40.7 mm (1.6 in)
1942	50.0 mm (2.0 in)
1943	39.6 mm (1.6 in)
1944	61.3 mm (2.4 in)
1945	44.6 mm (1.8 in)
1946	39.7 mm (1.6 in)
1947	33.5 mm (1.3 in)
1948	11.5 mm (0.5 in)
1949	17.8 mm (0.7 in)
1950	87.1 mm (3.4 in)
1951	45.3 mm (1.8 in)
1952	39.2 mm (1.5 in)
1953	73.6 mm (2.9 in)
1954	48.4 mm (1.9 in)
1955	56.1 mm (2.2 in)
1956	46.2 mm (1.8 in)
1957	50.8 mm (2.0 in)
1958	39.8 mm (1.6 in)
1959	74.4 mm (2.9 in)
1960	22.9 mm (0.9 in)
1961	11.9 mm (0.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Flat, 1932 to 1961. The record is 70 days in 1957, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Flat by year
Year	Longest dry spell (CDD)
1932	n/a
1933	11 days
1935	31 days
1936	20 days
1937	25 days
1938	44 days
1939	16 days
1940	23 days
1941	27 days
1942	22 days
1943	48 days
1944	28 days
1945	34 days
1946	27 days
1947	46 days
1948	34 days
1949	20 days
1950	41 days
1951	21 days
1952	19 days
1953	31 days
1954	40 days
1955	47 days
1956	30 days
1957	70 days
1958	47 days
1959	37 days
1960	54 days
1961	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 Flat falls on 9 June and the median first autumn frost on 9 August, which leaves a median of 61 days between them.

Frost dates and growing season at Flat
Measure	Median, all years	Earliest period	Recent period (1936 to 1959)	Recent against earliest	Fitted trend
Last spring frost	9 June	n/a	9 June	n/a	n/a
First autumn frost	9 August	n/a	9 August	n/a	n/a
Growing days	61 days	n/a	61 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.

Download the Data

Data for Flat standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Flat 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).