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Built 2026-10-19 (19 October 2026)

Roca Threshold Days by Year (USC00257246)

7 fixed thresholds counted per year at Roca (USC00257246): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Roca Thresholds

  • Roca: days with 10 mm (0.39 in) or more of precipitation in 48 years, most in 1993 with 40.
  • Roca: days with 25 mm (0.98 in) or more of precipitation in 48 years, most in 1984 with 14.
  • Roca: days with 10 cm (3.9 in) or more of snowfall in 39 years, most in 1983 with 6.
  • Roca: days with 50 mm (1.97 in) or more of precipitation in 38 years, most in 1984 with 5.
  • 7 fixed thresholds have at least one qualifying day at Roca.
48 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Roca Days per year at Roca with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1993. 0102030401954: 251955: 141956: 161958: 231959: 271960: 261961: 271962: 221963: 171964: 201965: 351966: 131967: 251968: 271969: 271970: 261971: 261972: 241973: 371974: 161975: 231976: 181977: 321978: 261979: 231980: 201981: 271982: 301983: 281984: 321985: 191986: 391987: 261988: 191989: 191990: 171991: 241992: 301993: 401994: 241995: 251996: 311997: 241998: 321999: 192000: 242001: 262002: 171954196019651970197519801985199019952000
Days per year at Roca with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1993.
Days with 10 mm (0.39 in) or more of precipitation per year at Roca
YearDaysDecade average
19542521
19551421
19561621
19582321
19592721
19602623.9
19612723.9
19622223.9
19631723.9
19642023.9
19653523.9
19661323.9
19672523.9
19682723.9
19692723.9
19702625.1
19712625.1
19722425.1
19733725.1
19741625.1
19752325.1
19761825.1
19773225.1
19782625.1
19792325.1
19802025.9
19812725.9
19823025.9
19832825.9
19843225.9
19851925.9
19863925.9
19872625.9
19881925.9
19891925.9
19901726.6
19912426.6
19923026.6
19934026.6
19942426.6
19952526.6
19963126.6
19972426.6
19983226.6
19991926.6
20002422.3
20012622.3
20021722.3
First to last qualifying date each year at Roca For each year, a bar from the first to the last day at Roca meeting 10 mm (0.39 in). 1954: 19 February 1954 to 26 October 19541955: 18 January 1955 to 6 October 19551956: 3 April 1956 to 4 November 19561958: 20 January 1958 to 18 November 19581959: 10 February 1959 to 21 September 19591960: 15 January 1960 to 14 October 19601961: 19 February 1961 to 16 November 19611962: 15 February 1962 to 15 November 19621963: 5 March 1963 to 21 October 19631964: 4 February 1964 to 11 December 19641965: 12 February 1965 to 25 December 19651966: 25 January 1966 to 28 December 19661967: 26 January 1967 to 24 October 19671968: 3 April 1968 to 19 December 19681969: 15 February 1969 to 28 December 19691970: 18 April 1970 to 9 November 19701971: 5 February 1971 to 30 December 19711972: 16 April 1972 to 30 December 19721973: 4 January 1973 to 24 December 19731974: 14 April 1974 to 15 December 19741975: 11 January 1975 to 26 November 19751976: 16 February 1976 to 26 September 19761977: 3 March 1977 to 9 November 19771978: 13 February 1978 to 26 November 19781979: 13 January 1979 to 21 November 19791980: 16 January 1980 to 8 December 19801981: 4 March 1981 to 17 December 19811982: 4 March 1982 to 28 December 19821983: 2 February 1983 to 28 November 19831984: 18 February 1984 to 16 December 19841985: 31 March 1985 to 18 October 19851986: 12 March 1986 to 7 December 19861987: 17 March 1987 to 9 December 19871988: 19 January 1988 to 16 November 19881989: 28 January 1989 to 29 October 19891990: 20 January 1990 to 4 November 19901991: 5 January 1991 to 23 December 19911992: 18 February 1992 to 25 November 19921993: 20 January 1993 to 13 November 19931994: 27 January 1994 to 7 December 19941995: 7 March 1995 to 11 November 19951996: 27 January 1996 to 30 November 19961997: 9 March 1997 to 29 November 19971998: 1 February 1998 to 10 November 19981999: 23 February 1999 to 23 November 19992000: 18 February 2000 to 18 December 20002001: 26 January 2001 to 25 November 20012002: 21 April 2002 to 4 October 200219541961196719731979198519911997JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Roca meeting 10 mm (0.39 in).
First to last qualifying date each year at Roca
YearFirst dateLast date
19541954-02-191954-10-26
19551955-01-181955-10-06
19561956-04-031956-11-04
19581958-01-201958-11-18
19591959-02-101959-09-21
19601960-01-151960-10-14
19611961-02-191961-11-16
19621962-02-151962-11-15
19631963-03-051963-10-21
19641964-02-041964-12-11
19651965-02-121965-12-25
19661966-01-251966-12-28
19671967-01-261967-10-24
19681968-04-031968-12-19
19691969-02-151969-12-28
19701970-04-181970-11-09
19711971-02-051971-12-30
19721972-04-161972-12-30
19731973-01-041973-12-24
19741974-04-141974-12-15
19751975-01-111975-11-26
19761976-02-161976-09-26
19771977-03-031977-11-09
19781978-02-131978-11-26
19791979-01-131979-11-21
19801980-01-161980-12-08
19811981-03-041981-12-17
19821982-03-041982-12-28
19831983-02-021983-11-28
19841984-02-181984-12-16
19851985-03-311985-10-18
19861986-03-121986-12-07
19871987-03-171987-12-09
19881988-01-191988-11-16
19891989-01-281989-10-29
19901990-01-201990-11-04
19911991-01-051991-12-23
19921992-02-181992-11-25
19931993-01-201993-11-13
19941994-01-271994-12-07
19951995-03-071995-11-11
19961996-01-271996-11-30
19971997-03-091997-11-29
19981998-02-011998-11-10
19991999-02-231999-11-23
20002000-02-182000-12-18
20012001-01-262001-11-25
20022002-04-212002-10-04

Every Fixed Threshold

Fixed thresholds at Roca
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4840199317
25 mm (0.98 in): Days with 25 mm or more rain481419848
50 mm (1.97 in): Days with 50 mm or more rain38519841
100 mm (3.94 in): Days with 100 mm or more rain8119581
10 cm (3.9 in): Days with 10 cm or more snowfall39619834
25 cm (9.8 in): Days with 25 cm or more snowfall6119651
50 cm (19.7 in): Days with 50 cm or more snowfall1119651

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

  • Data for Roca 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).