Fort Simpson Weather Records (CA002202115)

Record envelope, standing records and threshold days for Fort Simpson (CA002202115), Northwest Territories, Canada, with 84 years of record.

Key Facts for Fort Simpson

Fort Simpson (CA002202115) is a weather station in Northwest Territories, Canada at 61.77 latitude and -121.23 longitude, 169 m (554 ft) above sea level.
The station reports from 1942 to 2025, 84 years of record.
1,464 records set at Fort Simpson still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Northwest Territories, Canada, 61.77 latitude, -121.23 longitude.
Elevation: 169 m (554 ft).
Period of record: 1942 to 2025, 84 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 Fort Simpson. 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 Fort Simpson, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	8.9 C (48.0 F)	-49.4 C (-56.9 F)	n/a	n/a
Feb	7.0 C (44.6 F)	-48.0 C (-54.4 F)	n/a	n/a
Mar	12.0 C (53.6 F)	-40.3 C (-40.5 F)	n/a	n/a
Apr	21.0 C (69.8 F)	-38.0 C (-36.4 F)	n/a	n/a
May	27.0 C (80.6 F)	-16.1 C (3.0 F)	n/a	n/a
Jun	34.0 C (93.2 F)	-2.8 C (27.0 F)	n/a	n/a
Jul	33.0 C (91.4 F)	1.7 C (35.1 F)	n/a	n/a
Aug	33.0 C (91.4 F)	-3.7 C (25.3 F)	n/a	n/a
Sep	28.6 C (83.5 F)	-20.6 C (-5.1 F)	n/a	n/a
Oct	20.0 C (68.0 F)	-24.6 C (-12.3 F)	n/a	n/a
Nov	8.0 C (46.4 F)	-36.4 C (-33.5 F)	n/a	n/a
Dec	3.0 C (37.4 F)	-47.0 C (-52.6 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Fort Simpson still stand. 1981 holds the most, with 158.

Wettest Day of Each Month

Jun: 99.6 mm (3.9 in)

The wettest day on record for each calendar month at Fort Simpson. The most was 99.6 mm (3.9 in) on 16 June 1982.

Record daily precipitation for each month at Fort Simpson
Month	Record daily precipitation (mm)	Date
Jan	23.1 mm (0.9 in)	9 January 1961
Feb	17.0 mm (0.7 in)	16 February 1980
Mar	13.0 mm (0.5 in)	21 March 1943
Apr	45.0 mm (1.8 in)	25 April 1981
May	14.0 mm (0.6 in)	12 May 1947
Jun	99.6 mm (3.9 in)	16 June 1982
Jul	59.9 mm (2.4 in)	9 July 1960
Aug	40.9 mm (1.6 in)	23 August 1960
Sep	58.9 mm (2.3 in)	7 September 1980
Oct	31.0 mm (1.2 in)	2 October 1981
Nov	26.9 mm (1.1 in)	13 November 1981
Dec	20.1 mm (0.8 in)	16 December 1962

Period of Record Coverage

1957 to 1983

14 years of record at Fort Simpson, 1957 to 1983. 14 years have data for under 90 percent of days and are left out of rankings: 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1977 and others.

Days with data per year at Fort Simpson
Year	Days with data	Share of year	Complete
1957	193	53%	No
1958	198	54%	No
1959	175	48%	No
1960	163	45%	No
1961	170	47%	No
1962	175	48%	No
1963	90	25%	No
1977	128	35%	No
1978	232	64%	No
1979	231	63%	No
1980	240	66%	No
1981	237	65%	No
1982	207	57%	No
1983	216	59%	No

Latest Records

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

Extremes by Year

1942 to 1983

Yearly extremes at Fort Simpson: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	34.0 C (93.2 F)	1980	30.9 C (87.5 F)	14
Coldest night (TNn)	-49.4 C (-56.9 F)	1959	-43.9 C (-47.1 F)	14
Wettest day (Rx1day)	99.6 mm (3.9 in)	1982	27.9 mm (1.1 in)	20
Wettest five days (Rx5day)	110.1 mm (4.3 in)	1982	35.4 mm (1.4 in)	20
Longest dry spell (CDD)	23 days	1983	7 days	20

Hottest day (TXx)

The hottest day of the year at Fort Simpson, 1942 to 1983. The record is 34.0 C (93.2 F) in 1980, marked on the chart; the median year is 30.9 C (87.5 F).

Hottest day (TXx) at Fort Simpson by year
Year	Hottest day (TXx)
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1957	28.9 C (84.0 F)
1958	30.6 C (87.1 F)
1959	32.2 C (90.0 F)
1960	29.4 C (84.9 F)
1961	31.1 C (88.0 F)
1962	30.0 C (86.0 F)
1963	29.4 C (84.9 F)
1977	28.0 C (82.4 F)
1978	30.0 C (86.0 F)
1979	32.0 C (89.6 F)
1980	34.0 C (93.2 F)
1981	33.0 C (91.4 F)
1982	31.9 C (89.4 F)
1983	31.4 C (88.5 F)

Coldest night (TNn)

The coldest night of the year at Fort Simpson, 1942 to 1983. The record is -49.4 C (-56.9 F) in 1959, marked on the chart; the median year is -43.9 C (-47.1 F).

Coldest night (TNn) at Fort Simpson by year
Year	Coldest night (TNn)
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1957	-43.9 C (-47.0 F)
1958	-41.7 C (-43.1 F)
1959	-49.4 C (-56.9 F)
1960	-40.0 C (-40.0 F)
1961	-45.0 C (-49.0 F)
1962	-43.3 C (-45.9 F)
1963	-45.0 C (-49.0 F)
1977	-47.0 C (-52.6 F)
1978	-43.0 C (-45.4 F)
1979	-48.0 C (-54.4 F)
1980	-44.0 C (-47.2 F)
1981	-42.0 C (-43.6 F)
1982	-46.5 C (-51.7 F)
1983	-43.4 C (-46.1 F)

Wettest day (Rx1day)

The wettest day of the year at Fort Simpson, 1942 to 1983. The record is 99.6 mm (3.9 in) in 1982, marked on the chart; the median year is 27.9 mm (1.1 in).

Wettest day (Rx1day) at Fort Simpson by year
Year	Wettest day (Rx1day)
1942	13.0 mm (0.5 in)
1943	14.0 mm (0.6 in)
1944	61.0 mm (2.4 in)
1945	34.0 mm (1.3 in)
1946	15.0 mm (0.6 in)
1947	27.9 mm (1.1 in)
1957	29.0 mm (1.1 in)
1958	23.1 mm (0.9 in)
1959	24.9 mm (1.0 in)
1960	59.9 mm (2.4 in)
1961	33.0 mm (1.3 in)
1962	27.9 mm (1.1 in)
1963	24.9 mm (1.0 in)
1977	11.9 mm (0.5 in)
1978	98.0 mm (3.9 in)
1979	18.0 mm (0.7 in)
1980	58.9 mm (2.3 in)
1981	45.0 mm (1.8 in)
1982	99.6 mm (3.9 in)
1983	16.3 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Fort Simpson, 1942 to 1983. The record is 110.1 mm (4.3 in) in 1982, marked on the chart; the median year is 35.4 mm (1.4 in).

Wettest five days (Rx5day) at Fort Simpson by year
Year	Wettest five days (Rx5day)
1942	13.8 mm (0.5 in)
1943	22.1 mm (0.9 in)
1944	32.0 mm (1.3 in)
1945	55.1 mm (2.2 in)
1946	22.0 mm (0.9 in)
1947	32.3 mm (1.3 in)
1957	75.9 mm (3.0 in)
1958	44.2 mm (1.7 in)
1959	24.3 mm (1.0 in)
1960	86.9 mm (3.4 in)
1961	21.0 mm (0.8 in)
1962	41.2 mm (1.6 in)
1963	42.2 mm (1.7 in)
1977	16.2 mm (0.6 in)
1978	24.6 mm (1.0 in)
1979	20.8 mm (0.8 in)
1980	59.4 mm (2.3 in)
1981	68.0 mm (2.7 in)
1982	110.1 mm (4.3 in)
1983	38.5 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Fort Simpson, 1942 to 1983. The record is 23 days in 1983, marked on the chart; the median year is 7 days.

Longest dry spell (CDD) at Fort Simpson by year
Year	Longest dry spell (CDD)
1942	5 days
1943	7 days
1944	7 days
1945	10 days
1946	12 days
1947	12 days
1957	5 days
1958	5 days
1959	4 days
1960	11 days
1961	4 days
1962	6 days
1963	4 days
1977	4 days
1978	3 days
1979	11 days
1980	14 days
1981	11 days
1982	17 days
1983	23 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 Fort Simpson standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Fort Simpson 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 2026-10-14. Last revised 14 October 2026 (2026-10-14).