Richardson Weather Records (USC00507977)

Record envelope, standing records and threshold days for Richardson (USC00507977), Alaska, United States, with 55 years of record.

Key Facts for Richardson

Richardson (USC00507977) is a weather station in Alaska, United States at 64.28 latitude and -146.33 longitude, 271 m (889 ft) above sea level.
The station reports from 1917 to 1971, 55 years of record.
1,464 records set at Richardson 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, 64.28 latitude, -146.33 longitude.
Elevation: 271 m (889 ft).
Period of record: 1917 to 1971, 55 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 Richardson. 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 Richardson, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	6.7 C (44.1 F)	-52.8 C (-63.0 F)	n/a	n/a
Feb	12.2 C (54.0 F)	-49.4 C (-56.9 F)	n/a	n/a
Mar	13.9 C (57.0 F)	-48.3 C (-54.9 F)	n/a	n/a
Apr	21.1 C (70.0 F)	-30.0 C (-22.0 F)	n/a	n/a
May	28.3 C (82.9 F)	-18.9 C (-2.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	-1.7 C (28.9 F)	n/a	n/a
Jul	32.2 C (90.0 F)	-1.1 C (30.0 F)	n/a	n/a
Aug	31.7 C (89.1 F)	-5.6 C (21.9 F)	n/a	n/a
Sep	28.9 C (84.0 F)	-15.0 C (5.0 F)	n/a	n/a
Oct	19.4 C (66.9 F)	-34.4 C (-29.9 F)	n/a	n/a
Nov	15.6 C (60.1 F)	-51.1 C (-60.0 F)	n/a	n/a
Dec	11.1 C (52.0 F)	-53.3 C (-63.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Richardson still stand. 1969 holds the most, with 128.

Standing records at Richardson by the year they were set
Year set	Standing records
1917	98
1918	61
1919	41
1920	108
1921	116
1935	32
1936	81
1937	102
1938	79
1939	78
1940	90
1941	71
1942	62
1966	22
1967	68
1968	70
1969	128
1970	84
1971	73

Wettest Day of Each Month

Jul: 55.4 mm (2.2 in)

The wettest day on record for each calendar month at Richardson. The most was 55.4 mm (2.2 in) on 1 July 1939.

Record daily precipitation for each month at Richardson
Month	Record daily precipitation (mm)	Date
Jan	27.9 mm (1.1 in)	14 January 1937
Feb	7.4 mm (0.29 in)	8 February 1937
Mar	8.6 mm (0.34 in)	22 March 1967
Apr	15.2 mm (0.6 in)	21 April 1937
May	22.4 mm (0.9 in)	12 May 1968
Jun	32.5 mm (1.3 in)	22 June 1937
Jul	55.4 mm (2.2 in)	1 July 1939
Aug	53.3 mm (2.1 in)	5 August 1939
Sep	35.3 mm (1.4 in)	12 September 1940
Oct	22.9 mm (0.9 in)	21 October 1935
Nov	26.7 mm (1.1 in)	9 November 1969
Dec	21.6 mm (0.9 in)	19 December 1968

Period of Record Coverage

1917 to 1971

19 years of record at Richardson, 1917 to 1971. 9 years have data for under 90 percent of days and are left out of rankings: 1917, 1918, 1919, 1920, 1921, 1935, 1942, 1966 and others.

Days with data per year at Richardson
Year	Days with data	Share of year	Complete
1917	256	70%	No
1918	197	54%	No
1919	152	42%	No
1920	329	90%	No
1921	70	19%	No
1935	61	17%	No
1936	358	98%	Yes
1937	344	94%	Yes
1938	337	92%	Yes
1939	344	94%	Yes
1940	362	99%	Yes
1941	364	100%	Yes
1942	277	76%	No
1966	162	44%	No
1967	363	99%	Yes
1968	365	100%	Yes
1969	353	97%	Yes
1970	358	98%	Yes
1971	202	55%	No

Latest Records

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

Climate Trend

10 complete years, 1936 to 1970

One stripe for each of 10 complete years at Richardson, 1936 to 1970. Blue stripes are years cooler than the station's own mean of -1.8 C (28.7 F); red stripes are warmer. The coolest year was 1939, at -3.4 C (25.9 F), and the warmest was 1940, at -0.4 C (31.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Richardson as warming stripes, 1936 to 1970
Year	Annual mean temperature	Difference from the station mean
1936	-2.3 C	-0.46 C
1937	-2.0 C	-0.22 C
1938	-1.6 C	+0.26 C
1939	-3.4 C	-1.58 C
1940	-0.4 C	+1.47 C
1941	-1.6 C	+0.25 C
1967	-1.6 C	+0.24 C
1968	-2.2 C	-0.35 C
1969	-1.6 C	+0.26 C
1970	-1.7 C	+0.12 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 1971

Yearly extremes at Richardson: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1969	31.1 C (88.0 F)	19
Coldest night (TNn)	-53.3 C (-63.9 F)	1917	-45.0 C (-49.0 F)	19
Wettest day (Rx1day)	55.4 mm (2.2 in)	1939	21.4 mm (0.8 in)	16
Wettest five days (Rx5day)	112.5 mm (4.4 in)	1967	41.7 mm (1.6 in)	16
Longest dry spell (CDD)	93 days	1938	47 days	16

Hottest day (TXx)

The hottest day of the year at Richardson, 1917 to 1971. The record is 36.7 C (98.1 F) in 1969, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at Richardson by year
Year	Hottest day (TXx)
1917	31.1 C (88.0 F)
1918	27.8 C (82.0 F)
1919	30.0 C (86.0 F)
1920	25.6 C (78.1 F)
1921	5.6 C (42.1 F)
1935	8.9 C (48.0 F)
1936	31.7 C (89.1 F)
1937	33.3 C (91.9 F)
1938	35.0 C (95.0 F)
1939	30.0 C (86.0 F)
1940	31.7 C (89.1 F)
1941	30.0 C (86.0 F)
1942	32.2 C (90.0 F)
1966	28.9 C (84.0 F)
1967	31.1 C (88.0 F)
1968	31.1 C (88.0 F)
1969	36.7 C (98.1 F)
1970	32.2 C (90.0 F)
1971	30.0 C (86.0 F)

Coldest night (TNn)

The coldest night of the year at Richardson, 1917 to 1971. The record is -53.3 C (-63.9 F) in 1917, marked on the chart; the median year is -45.0 C (-49.0 F).

Coldest night (TNn) at Richardson by year
Year	Coldest night (TNn)
1917	-53.3 C (-63.9 F)
1918	-49.4 C (-56.9 F)
1919	-43.9 C (-47.0 F)
1920	-48.3 C (-54.9 F)
1921	-48.3 C (-54.9 F)
1935	-50.6 C (-59.1 F)
1936	-45.0 C (-49.0 F)
1937	-45.0 C (-49.0 F)
1938	-44.4 C (-47.9 F)
1939	-43.9 C (-47.0 F)
1940	-41.1 C (-42.0 F)
1941	-42.2 C (-44.0 F)
1942	-33.9 C (-29.0 F)
1966	-47.8 C (-54.0 F)
1967	-44.4 C (-47.9 F)
1968	-48.3 C (-54.9 F)
1969	-48.9 C (-56.0 F)
1970	-42.8 C (-45.0 F)
1971	-52.8 C (-63.0 F)

Wettest day (Rx1day)

The wettest day of the year at Richardson, 1917 to 1971. The record is 55.4 mm (2.2 in) in 1939, marked on the chart; the median year is 21.4 mm (0.8 in).

Wettest day (Rx1day) at Richardson by year
Year	Wettest day (Rx1day)
1917	0.0 mm (0.00 in)
1918	6.1 mm (0.24 in)
1919	n/a
1920	n/a
1921	n/a
1935	22.9 mm (0.9 in)
1936	20.3 mm (0.8 in)
1937	32.5 mm (1.3 in)
1938	23.9 mm (0.9 in)
1939	55.4 mm (2.2 in)
1940	35.3 mm (1.4 in)
1941	20.3 mm (0.8 in)
1942	18.5 mm (0.7 in)
1966	16.3 mm (0.6 in)
1967	41.9 mm (1.6 in)
1968	22.4 mm (0.9 in)
1969	26.7 mm (1.1 in)
1970	19.8 mm (0.8 in)
1971	10.9 mm (0.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Richardson, 1917 to 1971. The record is 112.5 mm (4.4 in) in 1967, marked on the chart; the median year is 41.7 mm (1.6 in).

Wettest five days (Rx5day) at Richardson by year
Year	Wettest five days (Rx5day)
1917	0.0 mm (0.00 in)
1918	16.7 mm (0.7 in)
1919	n/a
1920	n/a
1921	n/a
1935	35.8 mm (1.4 in)
1936	44.4 mm (1.7 in)
1937	59.7 mm (2.4 in)
1938	48.3 mm (1.9 in)
1939	73.1 mm (2.9 in)
1940	40.7 mm (1.6 in)
1941	40.1 mm (1.6 in)
1942	28.4 mm (1.1 in)
1966	42.7 mm (1.7 in)
1967	112.5 mm (4.4 in)
1968	43.5 mm (1.7 in)
1969	31.7 mm (1.2 in)
1970	45.4 mm (1.8 in)
1971	19.6 mm (0.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Richardson, 1917 to 1971. The record is 93 days in 1938, marked on the chart; the median year is 47 days.

Longest dry spell (CDD) at Richardson by year
Year	Longest dry spell (CDD)
1917	31 days
1918	33 days
1919	n/a
1920	n/a
1921	n/a
1935	28 days
1936	55 days
1937	51 days
1938	93 days
1939	57 days
1940	64 days
1941	57 days
1942	37 days
1966	30 days
1967	24 days
1968	46 days
1969	77 days
1970	43 days
1971	48 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 Richardson standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Richardson 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).