Daily records
Page built 2026-10-19
Data as of 2025-12-31
Search
Built 2026-10-19 (19 October 2026)

Rio Piedras Threshold Days by Year (RQC00668301)

9 fixed thresholds counted per year at Rio Piedras (RQC00668301): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rio Piedras Thresholds

  • Rio Piedras: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1958 with 84.
  • Rio Piedras: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1958 with 28.
  • Rio Piedras: days with 50 mm (1.97 in) or more of precipitation in 29 years, most in 1958 with 11.
  • Rio Piedras: nights with a minimum temperature at or above 20 C (68 F) in 27 years, most in 1958 with 275.
  • 9 fixed thresholds have at least one qualifying day at Rio Piedras.
26 years with a qualifying day
Days at or above 30 C (86 F) per year at Rio Piedras Days per year at Rio Piedras with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 312 in 1944. 01002003004001933: 1321934: 2461935: 2681936: 1641937: 1911939: 2271940: 2131941: 2231942: 2631943: 3011944: 3121946: 2331947: 2651948: 2341949: 2241950: 2051952: 2361953: 2321954: 1841955: 1951956: 1651957: 2291958: 2451959: 2401960: 3041961: 234193319361940194319471950195419571960
Days per year at Rio Piedras with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 312 in 1944.
Days at or above 30 C (86 F) per year at Rio Piedras
YearDaysDecade average
1933132204.7
1934246204.7
1935268204.7
1936164204.7
1937191204.7
1939227204.7
1940213252
1941223252
1942263252
1943301252
1944312252
1946233252
1947265252
1948234252
1949224252
1950205214.6
1952236214.6
1953232214.6
1954184214.6
1955195214.6
1956165214.6
1957229214.6
1958245214.6
1959240214.6
1960304269
1961234269
First to last qualifying date each year at Rio Piedras For each year, a bar from the first to the last day at Rio Piedras meeting 30 C (86 F). 1933: 26 February 1933 to 16 November 19331934: 10 January 1934 to 20 December 19341935: 1 January 1935 to 31 December 19351936: 1 January 1936 to 26 November 19361937: 14 March 1937 to 10 December 19371939: 1 January 1939 to 29 December 19391940: 8 January 1940 to 31 December 19401941: 5 January 1941 to 31 December 19411942: 1 January 1942 to 31 December 19421943: 8 January 1943 to 31 December 19431944: 1 January 1944 to 17 December 19441946: 1 January 1946 to 24 December 19461947: 5 February 1947 to 30 December 19471948: 2 January 1948 to 29 December 19481949: 1 January 1949 to 24 December 19491950: 19 February 1950 to 20 December 19501952: 8 January 1952 to 16 December 19521953: 2 January 1953 to 16 December 19531954: 6 February 1954 to 25 December 19541955: 14 January 1955 to 23 December 19551956: 12 January 1956 to 31 December 19561957: 15 February 1957 to 31 December 19571958: 3 January 1958 to 26 December 19581959: 5 January 1959 to 27 December 19591960: 1 January 1960 to 15 December 19601961: 16 January 1961 to 30 December 19611933193719421947195219561960JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rio Piedras meeting 30 C (86 F).
First to last qualifying date each year at Rio Piedras
YearFirst dateLast date
19331933-02-261933-11-16
19341934-01-101934-12-20
19351935-01-011935-12-31
19361936-01-011936-11-26
19371937-03-141937-12-10
19391939-01-011939-12-29
19401940-01-081940-12-31
19411941-01-051941-12-31
19421942-01-011942-12-31
19431943-01-081943-12-31
19441944-01-011944-12-17
19461946-01-011946-12-24
19471947-02-051947-12-30
19481948-01-021948-12-29
19491949-01-011949-12-24
19501950-02-191950-12-20
19521952-01-081952-12-16
19531953-01-021953-12-16
19541954-02-061954-12-25
19551955-01-141955-12-23
19561956-01-121956-12-31
19571957-02-151957-12-31
19581958-01-031958-12-26
19591959-01-051959-12-27
19601960-01-011960-12-15
19611961-01-161961-12-30

Every Fixed Threshold

Fixed thresholds at Rio Piedras
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days263121944234
35 C (95 F): Days72219421
90 F (32.2 C): Days26149194267
20 C (68 F): Tropical nights (min272751958248
25 C (77 F): Days with min211219333
10 mm (0.39 in): Days with 10 mm or more rain2984195850
25 mm (0.98 in): Days with 25 mm or more rain2928195818
50 mm (1.97 in): Days with 50 mm or more rain291119585
100 mm (3.94 in): Days with 100 mm or more rain14219432

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1933.

Download the Data

  • Data for Rio Piedras 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).