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

Patillas Dam Threshold Days by Year (RQC00666904)

11 fixed thresholds counted per year at Patillas Dam (RQC00666904): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Patillas Dam Thresholds

  • Patillas Dam: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1931 with 74.
  • Patillas Dam: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1931 with 35.
  • Patillas Dam: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 1936 with 11.
  • Patillas Dam: nights with a minimum temperature at or above 20 C (68 F) in 20 years, most in 1947 with 346.
  • 11 fixed thresholds have at least one qualifying day at Patillas Dam.
19 years with a qualifying day
Days at or above 30 C (86 F) per year at Patillas Dam Days per year at Patillas Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 250 in 1955. 01002003001938: 2301939: 2051941: 2361942: 2181943: 1911944: 1921945: 1631946: 551947: 841948: 361949: 371950: 1111952: 1841953: 2321954: 1861955: 2501956: 1761957: 2381958: 2181938194119431945194719491952195419561958
Days per year at Patillas Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 250 in 1955.
Days at or above 30 C (86 F) per year at Patillas Dam
YearDaysDecade average
1938230217.5
1939205217.5
1941236134.7
1942218134.7
1943191134.7
1944192134.7
1945163134.7
194655134.7
194784134.7
194836134.7
194937134.7
1950111199.4
1952184199.4
1953232199.4
1954186199.4
1955250199.4
1956176199.4
1957238199.4
1958218199.4
First to last qualifying date each year at Patillas Dam For each year, a bar from the first to the last day at Patillas Dam meeting 30 C (86 F). 1938: 13 January 1938 to 24 December 19381939: 2 January 1939 to 31 December 19391941: 20 January 1941 to 31 December 19411942: 1 January 1942 to 24 December 19421943: 2 January 1943 to 27 December 19431944: 7 January 1944 to 29 December 19441945: 1 January 1945 to 28 December 19451946: 2 January 1946 to 23 November 19461947: 17 February 1947 to 13 November 19471948: 5 March 1948 to 3 December 19481949: 17 April 1949 to 16 November 19491950: 1 February 1950 to 25 December 19501952: 10 January 1952 to 31 December 19521953: 6 January 1953 to 20 December 19531954: 6 February 1954 to 26 December 19541955: 7 January 1955 to 31 December 19551956: 3 January 1956 to 12 December 19561957: 7 January 1957 to 31 December 19571958: 8 January 1958 to 28 December 19581938194219451948195219551958JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Patillas Dam meeting 30 C (86 F).
First to last qualifying date each year at Patillas Dam
YearFirst dateLast date
19381938-01-131938-12-24
19391939-01-021939-12-31
19411941-01-201941-12-31
19421942-01-011942-12-24
19431943-01-021943-12-27
19441944-01-071944-12-29
19451945-01-011945-12-28
19461946-01-021946-11-23
19471947-02-171947-11-13
19481948-03-051948-12-03
19491949-04-171949-11-16
19501950-02-011950-12-25
19521952-01-101952-12-31
19531953-01-061953-12-20
19541954-02-061954-12-26
19551955-01-071955-12-31
19561956-01-031956-12-12
19571957-01-071957-12-31
19581958-01-081958-12-28

Every Fixed Threshold

Fixed thresholds at Patillas Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days192501955218
35 C (95 F): Days42319393
90 F (32.2 C): Days199519398
100 F (37.8 C): Days1119451
20 C (68 F): Tropical nights (min203461947291
25 C (77 F): Days with min1631195721
10 mm (0.39 in): Days with 10 mm or more rain3774193150
25 mm (0.98 in): Days with 25 mm or more rain3735193117
50 mm (1.97 in): Days with 50 mm or more rain361119365
100 mm (3.94 in): Days with 100 mm or more rain18319431
200 mm (7.87 in): Days with 200 mm or more rain2119431

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 Patillas Dam 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).