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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Rosny Threshold Days by Year (ASN00094059)

4 fixed thresholds counted per year at Rosny (ASN00094059): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosny Thresholds

  • Rosny: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1956 with 35.
  • Rosny: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1947 with 8.
  • Rosny: days with 50 mm (1.97 in) or more of precipitation in 11 years, most in 1938 with 3.
  • Rosny: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1954 with 1.
  • 4 fixed thresholds have at least one qualifying day at Rosny.
30 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rosny Days per year at Rosny with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1956. 0102030401938: 131939: 171940: 91941: 111942: 121943: 101944: 191945: 71946: 221947: 251948: 131949: 141950: 141951: 151952: 241953: 221954: 141955: 171956: 351957: 131958: 241959: 141960: 141961: 61962: 131964: 151965: 91967: 91968: 81969: 151938194119441947195019531956195919621967
Days per year at Rosny with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1956.
Days with 10 mm (0.39 in) or more of precipitation per year at Rosny
YearDaysDecade average
19381315
19391715
1940914.2
19411114.2
19421214.2
19431014.2
19441914.2
1945714.2
19462214.2
19472514.2
19481314.2
19491414.2
19501419.2
19511519.2
19522419.2
19532219.2
19541419.2
19551719.2
19563519.2
19571319.2
19582419.2
19591419.2
19601411.1
1961611.1
19621311.1
19641511.1
1965911.1
1967911.1
1968811.1
19691511.1
First to last qualifying date each year at Rosny For each year, a bar from the first to the last day at Rosny meeting 10 mm (0.39 in). 1938: 16 January 1938 to 11 December 19381939: 3 February 1939 to 24 November 19391940: 6 January 1940 to 31 December 19401941: 17 January 1941 to 5 December 19411942: 10 February 1942 to 24 December 19421943: 17 January 1943 to 4 December 19431944: 3 January 1944 to 22 December 19441945: 16 January 1945 to 21 September 19451946: 19 February 1946 to 29 December 19461947: 17 February 1947 to 26 December 19471948: 28 March 1948 to 29 December 19481949: 4 January 1949 to 12 November 19491950: 13 March 1950 to 30 December 19501951: 8 January 1951 to 16 December 19511952: 8 January 1952 to 7 December 19521953: 15 January 1953 to 8 December 19531954: 28 January 1954 to 21 November 19541955: 5 March 1955 to 31 December 19551956: 11 January 1956 to 16 November 19561957: 8 February 1957 to 26 December 19571958: 1 February 1958 to 16 December 19581959: 6 January 1959 to 27 December 19591960: 18 January 1960 to 11 October 19601961: 13 January 1961 to 30 August 19611962: 26 January 1962 to 9 December 19621964: 1 February 1964 to 14 December 19641965: 11 January 1965 to 2 December 19651967: 1 July 1967 to 19 December 19671968: 27 February 1968 to 24 December 19681969: 22 February 1969 to 14 December 196919381942194619501954195819621968JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rosny meeting 10 mm (0.39 in).
First to last qualifying date each year at Rosny
YearFirst dateLast date
19381938-01-161938-12-11
19391939-02-031939-11-24
19401940-01-061940-12-31
19411941-01-171941-12-05
19421942-02-101942-12-24
19431943-01-171943-12-04
19441944-01-031944-12-22
19451945-01-161945-09-21
19461946-02-191946-12-29
19471947-02-171947-12-26
19481948-03-281948-12-29
19491949-01-041949-11-12
19501950-03-131950-12-30
19511951-01-081951-12-16
19521952-01-081952-12-07
19531953-01-151953-12-08
19541954-01-281954-11-21
19551955-03-051955-12-31
19561956-01-111956-11-16
19571957-02-081957-12-26
19581958-02-011958-12-16
19591959-01-061959-12-27
19601960-01-181960-10-11
19611961-01-131961-08-30
19621962-01-261962-12-09
19641964-02-011964-12-14
19651965-01-111965-12-02
19671967-07-011967-12-19
19681968-02-271968-12-24
19691969-02-221969-12-14

Every Fixed Threshold

Fixed thresholds at Rosny
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3035195615
25 mm (0.98 in): Days with 25 mm or more rain28819473
50 mm (1.97 in): Days with 50 mm or more rain11319381
100 mm (3.94 in): Days with 100 mm or more rain2119541

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

Download the Data

  • Data for Rosny 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 (2025-12-31).