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Built 2026-10-19 (19 October 2026)

Fort Simpson Threshold Days by Year (CA002202100)

15 fixed thresholds counted per year at Fort Simpson (CA002202100): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Fort Simpson Thresholds

  • Fort Simpson: days with 10 mm (0.39 in) or more of precipitation in 51 years, most in 1938 with 17.
  • Fort Simpson: days with a maximum temperature at or below 0 C (32 F) in 49 years, most in 1961 with 199.
  • Fort Simpson: nights with a minimum temperature at or below 0 C (32 F) in 49 years, most in 1899 with 254.
  • Fort Simpson: nights with a minimum temperature at or below -10 C (14 F) in 49 years, most in 1961 with 184.
  • 15 fixed thresholds have at least one qualifying day at Fort Simpson.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Fort Simpson Days per year at Fort Simpson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 10 in 1923. 0358101912: 11915: 31916: 31917: 11920: 21923: 101924: 41929: 21930: 21931: 31932: 21933: 11935: 11936: 21937: 91938: 51941: 51942: 31943: 21944: 11945: 21946: 41947: 21948: 51949: 11950: 71951: 31952: 11953: 51954: 11955: 61956: 11958: 11959: 11961: 31962: 1191219201930193519411945194919531958
Days per year at Fort Simpson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 10 in 1923.
Days at or above 30 C (86 F) per year at Fort Simpson
YearDaysDecade average
191212
191532
191632
191712
192024.5
1923104.5
192444.5
192924.5
193023.1
193133.1
193223.1
193313.1
193513.1
193623.1
193793.1
193853.1
194152.8
194232.8
194322.8
194412.8
194522.8
194642.8
194722.8
194852.8
194912.8
195072.9
195132.9
195212.9
195352.9
195412.9
195562.9
195612.9
195812.9
195912.9
196132
196212
First to last qualifying date each year at Fort Simpson For each year, a bar from the first to the last day at Fort Simpson meeting 30 C (86 F). 1912: 18 August 1912 to 18 August 19121915: 10 August 1915 to 14 August 19151916: 30 June 1916 to 12 August 19161917: 14 July 1917 to 14 July 19171920: 7 July 1920 to 16 July 19201923: 3 July 1923 to 3 October 19231924: 13 May 1924 to 29 June 19241929: 24 July 1929 to 4 August 19291930: 12 July 1930 to 16 July 19301931: 31 July 1931 to 18 August 19311932: 8 August 1932 to 16 August 19321933: 16 July 1933 to 16 July 19331935: 20 July 1935 to 20 July 19351936: 3 June 1936 to 6 July 19361937: 10 June 1937 to 26 July 19371938: 4 July 1938 to 2 September 19381941: 14 July 1941 to 11 August 19411942: 6 June 1942 to 26 June 19421943: 11 July 1943 to 6 August 19431944: 19 July 1944 to 19 July 19441945: 13 July 1945 to 7 August 19451946: 17 June 1946 to 27 August 19461947: 25 July 1947 to 26 July 19471948: 30 May 1948 to 10 August 19481949: 13 July 1949 to 13 July 19491950: 16 June 1950 to 26 July 19501951: 17 July 1951 to 3 August 19511952: 13 July 1952 to 13 July 19521953: 8 July 1953 to 7 August 19531954: 1 July 1954 to 1 July 19541955: 10 June 1955 to 3 July 19551956: 19 June 1956 to 19 June 19561958: 29 July 1958 to 29 July 19581959: 11 July 1959 to 11 July 19591961: 6 July 1961 to 12 July 19611962: 7 June 1962 to 7 June 196219121923193219381945195019551962JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Fort Simpson meeting 30 C (86 F).
First to last qualifying date each year at Fort Simpson
YearFirst dateLast date
19121912-08-181912-08-18
19151915-08-101915-08-14
19161916-06-301916-08-12
19171917-07-141917-07-14
19201920-07-071920-07-16
19231923-07-031923-10-03
19241924-05-131924-06-29
19291929-07-241929-08-04
19301930-07-121930-07-16
19311931-07-311931-08-18
19321932-08-081932-08-16
19331933-07-161933-07-16
19351935-07-201935-07-20
19361936-06-031936-07-06
19371937-06-101937-07-26
19381938-07-041938-09-02
19411941-07-141941-08-11
19421942-06-061942-06-26
19431943-07-111943-08-06
19441944-07-191944-07-19
19451945-07-131945-08-07
19461946-06-171946-08-27
19471947-07-251947-07-26
19481948-05-301948-08-10
19491949-07-131949-07-13
19501950-06-161950-07-26
19511951-07-171951-08-03
19521952-07-131952-07-13
19531953-07-081953-08-07
19541954-07-011954-07-01
19551955-06-101955-07-03
19561956-06-191956-06-19
19581958-07-291958-07-29
19591959-07-111959-07-11
19611961-07-061961-07-12
19621962-06-071962-06-07

Every Fixed Threshold

Fixed thresholds at Fort Simpson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days361019231
35 C (95 F): Days4219411
90 F (32.2 C): Days15419551
0 C (32 F): Ice days (max491991961155
0 C (32 F): Frost days (min492541899226
-10 C (14 F): Days with min491841961153
-20 C (-4 F): Days with min491361955110
-30 C (-22 F): Days with min4977189944
-40 C (-40 F): Days with min483519177
20 C (68 F): Tropical nights (min1119161
10 mm (0.39 in): Days with 10 mm or more rain5117193812
25 mm (0.98 in): Days with 25 mm or more rain34419401
50 mm (1.97 in): Days with 50 mm or more rain4119351
10 cm (3.9 in): Days with 10 cm or more snowfall381019384
25 cm (9.8 in): Days with 25 cm or more snowfall3119111

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

  • 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).