Fort Simpson A Weather Records (CA002202101)

Record envelope, standing records and threshold days for Fort Simpson A (CA002202101), Northwest Territories, Canada, with 52 years of record.

Key Facts for Fort Simpson A

Fort Simpson A (CA002202101) 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 1963 to 2014, 52 years of record.
1,464 records set at Fort Simpson A 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: 1963 to 2014, 52 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 A. 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 A, 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)	-50.0 C (-58.0 F)	n/a	n/a
Feb	14.4 C (57.9 F)	-53.3 C (-63.9 F)	n/a	n/a
Mar	13.9 C (57.0 F)	-42.2 C (-44.0 F)	n/a	n/a
Apr	25.5 C (77.9 F)	-38.3 C (-36.9 F)	n/a	n/a
May	28.9 C (84.0 F)	-15.2 C (4.6 F)	n/a	n/a
Jun	33.9 C (93.0 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	35.0 C (95.0 F)	-1.1 C (30.0 F)	n/a	n/a
Aug	34.4 C (93.9 F)	-3.7 C (25.3 F)	n/a	n/a
Sep	30.0 C (86.0 F)	-20.6 C (-5.1 F)	n/a	n/a
Oct	20.6 C (69.1 F)	-25.6 C (-14.1 F)	n/a	n/a
Nov	12.2 C (54.0 F)	-41.7 C (-43.1 F)	n/a	n/a
Dec	10.6 C (51.1 F)	-50.6 C (-59.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Fort Simpson A still stand. 1966 holds the most, with 113.

Standing records at Fort Simpson A by the year they were set
Year set	Standing records
1963	18
1964	73
1965	73
1966	113
1967	57
1968	62
1969	84
1970	47
1971	69
1972	90
1973	50
1974	60
1975	85
1976	61
1977	63
1978	38
1979	82
1980	75
1981	110
1982	90
1983	64

Wettest Day of Each Month

Jun: 50.5 mm (2.0 in)

The wettest day on record for each calendar month at Fort Simpson A. The most was 50.5 mm (2.0 in) on 26 June 1973.

Record daily precipitation for each month at Fort Simpson A
Month	Record daily precipitation (mm)	Date
Jan	12.7 mm (0.5 in)	1 January 1973
Feb	13.9 mm (0.5 in)	22 February 1981
Mar	18.6 mm (0.7 in)	23 March 1979
Apr	38.4 mm (1.5 in)	25 April 1981
May	30.0 mm (1.2 in)	3 May 1970
Jun	50.5 mm (2.0 in)	26 June 1973
Jul	46.9 mm (1.8 in)	22 July 1981
Aug	34.0 mm (1.3 in)	20 August 1976
Sep	30.2 mm (1.2 in)	6 September 1980
Oct	45.9 mm (1.8 in)	1 October 1981
Nov	27.0 mm (1.1 in)	12 November 1981
Dec	13.3 mm (0.5 in)	6 December 1981

Period of Record Coverage

1963 to 1983

21 years of record at Fort Simpson A, 1963 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1963.

Days with data per year at Fort Simpson A
Year	Days with data	Share of year	Complete
1963	61	17%	No
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	344	94%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes

Latest Records

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

Climate Trend

19 complete years, 1964 to 1983

One stripe for each of 19 complete years at Fort Simpson A, 1964 to 1983. Blue stripes are years cooler than the station's own mean of -4.0 C (24.8 F); red stripes are warmer. The coolest year was 1966, at -5.7 C (21.8 F), and the warmest was 1981, at -1.4 C (29.5 F). The strongest colour marks a difference of 2.7 C (4.9 F).

Annual mean temperature at Fort Simpson A as warming stripes, 1964 to 1983
Year	Annual mean temperature	Difference from the station mean
1964	-4.7 C	-0.68 C
1965	-4.2 C	-0.18 C
1966	-5.7 C	-1.69 C
1967	-4.3 C	-0.33 C
1968	-4.2 C	-0.22 C
1969	-3.8 C	+0.22 C
1970	-3.8 C	+0.20 C
1971	-4.5 C	-0.53 C
1972	-5.4 C	-1.36 C
1973	-3.3 C	+0.70 C
1974	-5.6 C	-1.58 C
1975	-4.3 C	-0.26 C
1976	-2.4 C	+1.60 C
1977	-3.1 C	+0.92 C
1978	-3.2 C	+0.81 C
1980	-2.3 C	+1.67 C
1981	-1.4 C	+2.62 C
1982	-5.5 C	-1.47 C
1983	-4.5 C	-0.46 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

1963 to 1983

Yearly extremes at Fort Simpson A: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	1975	31.4 C (88.5 F)	21
Coldest night (TNn)	-53.3 C (-63.9 F)	1968	-46.1 C (-51.0 F)	21
Wettest day (Rx1day)	50.5 mm (2.0 in)	1973	28.4 mm (1.1 in)	21
Wettest five days (Rx5day)	68.9 mm (2.7 in)	1981	38.2 mm (1.5 in)	21
Longest dry spell (CDD)	72 days	1965	26 days	21

Hottest day (TXx)

The hottest day of the year at Fort Simpson A, 1963 to 1983. The record is 35.0 C (95.0 F) in 1975, marked on the chart; the median year is 31.4 C (88.5 F).

Hottest day (TXx) at Fort Simpson A by year
Year	Hottest day (TXx)
1963	5.0 C (41.0 F)
1964	33.9 C (93.0 F)
1965	29.4 C (84.9 F)
1966	30.0 C (86.0 F)
1967	31.7 C (89.1 F)
1968	30.6 C (87.1 F)
1969	33.9 C (93.0 F)
1970	31.7 C (89.1 F)
1971	34.4 C (93.9 F)
1972	31.1 C (88.0 F)
1973	30.6 C (87.1 F)
1974	29.4 C (84.9 F)
1975	35.0 C (95.0 F)
1976	30.0 C (86.0 F)
1977	30.2 C (86.4 F)
1978	29.5 C (85.1 F)
1979	31.6 C (88.9 F)
1980	33.5 C (92.3 F)
1981	32.5 C (90.5 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 A, 1963 to 1983. The record is -53.3 C (-63.9 F) in 1968, marked on the chart; the median year is -46.1 C (-51.0 F).

Coldest night (TNn) at Fort Simpson A by year
Year	Coldest night (TNn)
1963	-41.1 C (-42.0 F)
1964	-43.9 C (-47.0 F)
1965	-49.4 C (-56.9 F)
1966	-48.3 C (-54.9 F)
1967	-45.0 C (-49.0 F)
1968	-53.3 C (-63.9 F)
1969	-46.1 C (-51.0 F)
1970	-46.1 C (-51.0 F)
1971	-48.9 C (-56.0 F)
1972	-50.0 C (-58.0 F)
1973	-46.1 C (-51.0 F)
1974	-45.6 C (-50.1 F)
1975	-50.6 C (-59.1 F)
1976	-43.3 C (-45.9 F)
1977	-47.3 C (-53.1 F)
1978	-43.0 C (-45.4 F)
1979	-47.9 C (-54.2 F)
1980	-44.4 C (-47.9 F)
1981	-44.7 C (-48.5 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 A, 1963 to 1983. The record is 50.5 mm (2.0 in) in 1973, marked on the chart; the median year is 28.4 mm (1.1 in).

Wettest day (Rx1day) at Fort Simpson A by year
Year	Wettest day (Rx1day)
1963	12.2 mm (0.5 in)
1964	23.1 mm (0.9 in)
1965	30.5 mm (1.2 in)
1966	28.7 mm (1.1 in)
1967	16.5 mm (0.6 in)
1968	28.4 mm (1.1 in)
1969	20.6 mm (0.8 in)
1970	30.0 mm (1.2 in)
1971	21.6 mm (0.9 in)
1972	14.7 mm (0.6 in)
1973	50.5 mm (2.0 in)
1974	30.5 mm (1.2 in)
1975	31.8 mm (1.3 in)
1976	34.0 mm (1.3 in)
1977	28.2 mm (1.1 in)
1978	31.2 mm (1.2 in)
1979	18.6 mm (0.7 in)
1980	34.2 mm (1.3 in)
1981	46.9 mm (1.8 in)
1982	23.9 mm (0.9 in)
1983	16.2 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Fort Simpson A, 1963 to 1983. The record is 68.9 mm (2.7 in) in 1981, marked on the chart; the median year is 38.2 mm (1.5 in).

Wettest five days (Rx5day) at Fort Simpson A by year
Year	Wettest five days (Rx5day)
1963	15.7 mm (0.6 in)
1964	33.5 mm (1.3 in)
1965	36.9 mm (1.5 in)
1966	37.4 mm (1.5 in)
1967	20.8 mm (0.8 in)
1968	47.0 mm (1.9 in)
1969	29.5 mm (1.2 in)
1970	41.0 mm (1.6 in)
1971	38.2 mm (1.5 in)
1972	31.0 mm (1.2 in)
1973	58.4 mm (2.3 in)
1974	67.6 mm (2.7 in)
1975	60.2 mm (2.4 in)
1976	55.6 mm (2.2 in)
1977	39.7 mm (1.6 in)
1978	42.9 mm (1.7 in)
1979	21.6 mm (0.9 in)
1980	46.4 mm (1.8 in)
1981	68.9 mm (2.7 in)
1982	36.5 mm (1.4 in)
1983	25.4 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Fort Simpson A, 1963 to 1983. The record is 72 days in 1965, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at Fort Simpson A by year
Year	Longest dry spell (CDD)
1963	9 days
1964	26 days
1965	72 days
1966	21 days
1967	31 days
1968	19 days
1969	37 days
1970	26 days
1971	26 days
1972	23 days
1973	42 days
1974	21 days
1975	27 days
1976	32 days
1977	29 days
1978	26 days
1979	32 days
1980	36 days
1981	20 days
1982	21 days
1983	25 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 A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Fort Simpson A 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).