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Built 2026-10-19 (19 October 2026)

Barrage Mercier Threshold Days by Year (CA007030457)

16 fixed thresholds counted per year at Barrage Mercier (CA007030457): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Barrage Mercier Thresholds

  • Barrage Mercier: days with a maximum temperature at or below 0 C (32 F) in 51 years, most in 1940 with 125.
  • Barrage Mercier: nights with a minimum temperature at or below 0 C (32 F) in 51 years, most in 1946 with 210.
  • Barrage Mercier: nights with a minimum temperature at or below -10 C (14 F) in 51 years, most in 1947 with 113.
  • Barrage Mercier: nights with a minimum temperature at or below -20 C (-4 F) in 51 years, most in 1963 with 61.
  • 16 fixed thresholds have at least one qualifying day at Barrage Mercier.
50 years with a qualifying day
Days at or above 30 C (86 F) per year at Barrage Mercier Days per year at Barrage Mercier with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 1955. 01020301927: 111928: 71929: 111930: 41931: 191932: 91933: 101934: 31935: 61936: 41937: 241938: 51939: 61940: 61941: 91942: 31943: 31944: 171946: 51947: 131948: 51949: 141950: 51951: 11952: 81953: 141955: 271956: 31957: 71958: 11959: 181960: 11961: 51962: 111963: 171964: 81965: 11966: 81967: 21968: 41969: 51970: 61971: 51972: 31973: 51974: 21975: 171977: 111978: 101979: 61927193219371942194819531959196419691974
Days per year at Barrage Mercier with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 1955.
Days at or above 30 C (86 F) per year at Barrage Mercier
YearDaysDecade average
1927119.7
192879.7
1929119.7
193049
1931199
193299
1933109
193439
193569
193649
1937249
193859
193969
194068.3
194198.3
194238.3
194338.3
1944178.3
194658.3
1947138.3
194858.3
1949148.3
195059.3
195119.3
195289.3
1953149.3
1955279.3
195639.3
195779.3
195819.3
1959189.3
196016.2
196156.2
1962116.2
1963176.2
196486.2
196516.2
196686.2
196726.2
196846.2
196956.2
197067.2
197157.2
197237.2
197357.2
197427.2
1975177.2
1977117.2
1978107.2
197967.2
First to last qualifying date each year at Barrage Mercier For each year, a bar from the first to the last day at Barrage Mercier meeting 30 C (86 F). 1927: 29 June 1927 to 6 August 19271928: 2 July 1928 to 16 August 19281929: 28 May 1929 to 12 July 19291930: 23 May 1930 to 14 June 19301931: 13 June 1931 to 13 September 19311932: 16 May 1932 to 14 August 19321933: 6 June 1933 to 23 July 19331934: 27 May 1934 to 5 June 19341935: 6 July 1935 to 19 August 19351936: 9 July 1936 to 13 July 19361937: 1 June 1937 to 3 September 19371938: 21 June 1938 to 16 August 19381939: 5 July 1939 to 16 September 19391940: 24 July 1940 to 13 August 19401941: 19 June 1941 to 25 July 19411942: 11 June 1942 to 13 June 19421943: 5 June 1943 to 12 July 19431944: 1 June 1944 to 17 August 19441946: 25 June 1946 to 30 June 19461947: 30 June 1947 to 11 September 19471948: 12 July 1948 to 27 August 19481949: 3 June 1949 to 27 August 19491950: 7 June 1950 to 12 July 19501951: 25 July 1951 to 25 July 19511952: 2 July 1952 to 28 August 19521953: 10 May 1953 to 4 September 19531955: 22 May 1955 to 17 September 19551956: 12 June 1956 to 14 June 19561957: 15 June 1957 to 3 August 19571958: 24 July 1958 to 24 July 19581959: 8 June 1959 to 10 September 19591960: 7 September 1960 to 7 September 19601961: 29 June 1961 to 4 September 19611962: 16 May 1962 to 31 August 19621963: 3 June 1963 to 28 July 19631964: 23 May 1964 to 28 July 19641965: 28 June 1965 to 28 June 19651966: 24 May 1966 to 12 July 19661967: 3 June 1967 to 4 June 19671968: 15 July 1968 to 18 July 19681969: 27 June 1969 to 31 August 19691970: 9 June 1970 to 15 August 19701971: 19 May 1971 to 10 August 19711972: 23 May 1972 to 12 July 19721973: 7 July 1973 to 2 September 19731974: 14 July 1974 to 21 August 19741975: 20 May 1975 to 10 August 19751977: 16 May 1977 to 28 August 19771978: 25 May 1978 to 15 August 19781979: 9 May 1979 to 24 July 197919271934194119491957196419711979JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Barrage Mercier meeting 30 C (86 F).
First to last qualifying date each year at Barrage Mercier
YearFirst dateLast date
19271927-06-291927-08-06
19281928-07-021928-08-16
19291929-05-281929-07-12
19301930-05-231930-06-14
19311931-06-131931-09-13
19321932-05-161932-08-14
19331933-06-061933-07-23
19341934-05-271934-06-05
19351935-07-061935-08-19
19361936-07-091936-07-13
19371937-06-011937-09-03
19381938-06-211938-08-16
19391939-07-051939-09-16
19401940-07-241940-08-13
19411941-06-191941-07-25
19421942-06-111942-06-13
19431943-06-051943-07-12
19441944-06-011944-08-17
19461946-06-251946-06-30
19471947-06-301947-09-11
19481948-07-121948-08-27
19491949-06-031949-08-27
19501950-06-071950-07-12
19511951-07-251951-07-25
19521952-07-021952-08-28
19531953-05-101953-09-04
19551955-05-221955-09-17
19561956-06-121956-06-14
19571957-06-151957-08-03
19581958-07-241958-07-24
19591959-06-081959-09-10
19601960-09-071960-09-07
19611961-06-291961-09-04
19621962-05-161962-08-31
19631963-06-031963-07-28
19641964-05-231964-07-28
19651965-06-281965-06-28
19661966-05-241966-07-12
19671967-06-031967-06-04
19681968-07-151968-07-18
19691969-06-271969-08-31
19701970-06-091970-08-15
19711971-05-191971-08-10
19721972-05-231972-07-12
19731973-07-071973-09-02
19741974-07-141974-08-21
19751975-05-201975-08-10
19771977-05-161977-08-28
19781978-05-251978-08-15
19791979-05-091979-07-24

Every Fixed Threshold

Fixed thresholds at Barrage Mercier
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days502719556
35 C (95 F): Days9219371
90 F (32.2 C): Days361319375
0 C (32 F): Ice days (max51125194067
0 C (32 F): Frost days (min512101946150
-10 C (14 F): Days with min51113194763
-20 C (-4 F): Days with min5161196335
-30 C (-22 F): Days with min5017194813
-40 C (-40 F): Days with min11219512
20 C (68 F): Tropical nights (min28619314
10 mm (0.39 in): Days with 10 mm or more rain5142196726
25 mm (0.98 in): Days with 25 mm or more rain501119655
50 mm (1.97 in): Days with 50 mm or more rain19219361
10 cm (3.9 in): Days with 10 cm or more snowfall501319512
25 cm (9.8 in): Days with 25 cm or more snowfall9219331
50 cm (19.7 in): Days with 50 cm or more snowfall1119551

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1927.

Download the Data

  • Data for Barrage Mercier 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).