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Built 2026-10-19 (19 October 2026)

Rivers A Threshold Days by Year (CA005012440)

17 fixed thresholds counted per year at Rivers A (CA005012440): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rivers A Thresholds

  • Rivers A: days with a maximum temperature at or above 30 C (86 F) in 31 years, most in 1961 with 36.
  • Rivers A: days with a maximum temperature at or below 0 C (32 F) in 31 years, most in 1948 with 145.
  • Rivers A: nights with a minimum temperature at or below 0 C (32 F) in 31 years, most in 1945 with 222.
  • Rivers A: nights with a minimum temperature at or below -10 C (14 F) in 31 years, most in 1955 with 139.
  • 17 fixed thresholds have at least one qualifying day at Rivers A.
31 years with a qualifying day
Days at or above 30 C (86 F) per year at Rivers A Days per year at Rivers A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 36 in 1961. 0102030401939: 281940: 261941: 151942: 61943: 101944: 81945: 121946: 151947: 181948: 91949: 191950: 41951: 81952: 121953: 131954: 41955: 121956: 51957: 111958: 151959: 141960: 221961: 361962: 41963: 131964: 101965: 61966: 231967: 211968: 61969: 1319391943194719511955195919631967
Days per year at Rivers A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 36 in 1961.
Days at or above 30 C (86 F) per year at Rivers A
YearDaysDecade average
19392828
19402613.8
19411513.8
1942613.8
19431013.8
1944813.8
19451213.8
19461513.8
19471813.8
1948913.8
19491913.8
195049.8
195189.8
1952129.8
1953139.8
195449.8
1955129.8
195659.8
1957119.8
1958159.8
1959149.8
19602215.4
19613615.4
1962415.4
19631315.4
19641015.4
1965615.4
19662315.4
19672115.4
1968615.4
19691315.4
First to last qualifying date each year at Rivers A For each year, a bar from the first to the last day at Rivers A meeting 30 C (86 F). 1939: 1 May 1939 to 18 September 19391940: 11 May 1940 to 16 September 19401941: 18 May 1941 to 1 September 19411942: 22 July 1942 to 9 September 19421943: 22 May 1943 to 30 August 19431944: 27 May 1944 to 6 August 19441945: 21 June 1945 to 5 September 19451946: 28 May 1946 to 16 September 19461947: 2 July 1947 to 22 August 19471948: 19 May 1948 to 3 September 19481949: 29 April 1949 to 25 August 19491950: 10 July 1950 to 29 July 19501951: 23 May 1951 to 29 July 19511952: 28 April 1952 to 25 August 19521953: 6 May 1953 to 30 August 19531954: 23 June 1954 to 28 July 19541955: 29 June 1955 to 2 September 19551956: 21 May 1956 to 11 June 19561957: 10 July 1957 to 6 August 19571958: 12 May 1958 to 18 August 19581959: 5 June 1959 to 24 August 19591960: 12 May 1960 to 20 September 19601961: 30 May 1961 to 31 August 19611962: 26 June 1962 to 21 August 19621963: 30 May 1963 to 9 September 19631964: 20 May 1964 to 17 September 19641965: 3 July 1965 to 13 August 19651966: 21 May 1966 to 11 September 19661967: 27 June 1967 to 6 September 19671968: 3 June 1968 to 14 September 19681969: 26 May 1969 to 13 September 196919391943194719511955195919631967JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rivers A meeting 30 C (86 F).
First to last qualifying date each year at Rivers A
YearFirst dateLast date
19391939-05-011939-09-18
19401940-05-111940-09-16
19411941-05-181941-09-01
19421942-07-221942-09-09
19431943-05-221943-08-30
19441944-05-271944-08-06
19451945-06-211945-09-05
19461946-05-281946-09-16
19471947-07-021947-08-22
19481948-05-191948-09-03
19491949-04-291949-08-25
19501950-07-101950-07-29
19511951-05-231951-07-29
19521952-04-281952-08-25
19531953-05-061953-08-30
19541954-06-231954-07-28
19551955-06-291955-09-02
19561956-05-211956-06-11
19571957-07-101957-08-06
19581958-05-121958-08-18
19591959-06-051959-08-24
19601960-05-121960-09-20
19611961-05-301961-08-31
19621962-06-261962-08-21
19631963-05-301963-09-09
19641964-05-201964-09-17
19651965-07-031965-08-13
19661966-05-211966-09-11
19671967-06-271967-09-06
19681968-06-031968-09-14
19691969-05-261969-09-13

Every Fixed Threshold

Fixed thresholds at Rivers A
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3136196113
35 C (95 F): Days14619392
90 F (32.2 C): Days301819397
0 C (32 F): Ice days (max311451948134
0 C (32 F): Frost days (min312221945200
-10 C (14 F): Days with min311391955114
-20 C (-4 F): Days with min3185195062
-30 C (-22 F): Days with min3130195016
-40 C (-40 F): Days with min10419432
20 C (68 F): Tropical nights (min11419551
10 mm (0.39 in): Days with 10 mm or more rain3118194217
25 mm (0.98 in): Days with 25 mm or more rain28519414
50 mm (1.97 in): Days with 50 mm or more rain12319411
100 mm (3.94 in): Days with 100 mm or more rain2119521
10 cm (3.9 in): Days with 10 cm or more snowfall25619553
25 cm (9.8 in): Days with 25 cm or more snowfall2119591
50 cm (19.7 in): Days with 50 cm or more snowfall1119691

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

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

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