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Built 2026-10-18 (18 October 2026)

Rocklands Reservoir Threshold Days by Year

4 fixed thresholds counted per year at Rocklands Reservoir (ASN00079052): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rocklands Reservoir Thresholds

  • Rocklands Reservoir: days with 10 mm (0.39 in) or more of precipitation in 61 years, most in 1960 with 30.
  • Rocklands Reservoir: days with 25 mm (0.98 in) or more of precipitation in 52 years, most in 1979 with 8.
  • Rocklands Reservoir: days with 50 mm (1.97 in) or more of precipitation in 9 years, most in 1952 with 1.
  • Rocklands Reservoir: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1952 with 1.
  • 4 fixed thresholds have at least one qualifying day at Rocklands Reservoir.
61 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rocklands Reservoir Days per year at Rocklands Reservoir with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1960. 01020301949: 151950: 161951: 201952: 221953: 211954: 171955: 131956: 271957: 121958: 151959: 131960: 301961: 91962: 161963: 141964: 241965: 151966: 141967: 51968: 161969: 151970: 131971: 221972: 131973: 211974: 231975: 201976: 111977: 131978: 181979: 191980: 171981: 191982: 81983: 181984: 171985: 171986: 171987: 151988: 191989: 121990: 181991: 151992: 241993: 191994: 111995: 211996: 211997: 121998: 231999: 202000: 162001: 242002: 82003: 142004: 122005: 152006: 42007: 202008: 112009: 13194919561963197019771984199119982005
Days per year at Rocklands Reservoir with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1960.
Days with 10 mm (0.39 in) or more of precipitation per year at Rocklands Reservoir
YearDaysDecade average
19491515
19501617.6
19512017.6
19522217.6
19532117.6
19541717.6
19551317.6
19562717.6
19571217.6
19581517.6
19591317.6
19603015.8
1961915.8
19621615.8
19631415.8
19642415.8
19651515.8
19661415.8
1967515.8
19681615.8
19691515.8
19701317.3
19712217.3
19721317.3
19732117.3
19742317.3
19752017.3
19761117.3
19771317.3
19781817.3
19791917.3
19801715.9
19811915.9
1982815.9
19831815.9
19841715.9
19851715.9
19861715.9
19871515.9
19881915.9
19891215.9
19901818.4
19911518.4
19922418.4
19931918.4
19941118.4
19952118.4
19962118.4
19971218.4
19982318.4
19992018.4
20001613.7
20012413.7
2002813.7
20031413.7
20041213.7
20051513.7
2006413.7
20072013.7
20081113.7
20091313.7
First to last qualifying date each year at Rocklands Reservoir For each year, a bar from the first to the last day at Rocklands Reservoir meeting 10 mm (0.39 in). 1949: 20 February 1949 to 22 November 19491950: 15 February 1950 to 20 December 19501951: 19 February 1951 to 10 December 19511952: 25 January 1952 to 16 November 19521953: 4 April 1953 to 7 December 19531954: 28 January 1954 to 12 December 19541955: 14 April 1955 to 31 December 19551956: 3 March 1956 to 17 October 19561957: 7 February 1957 to 26 December 19571958: 14 April 1958 to 21 November 19581959: 25 January 1959 to 25 December 19591960: 4 January 1960 to 28 December 19601961: 7 April 1961 to 17 December 19611962: 20 February 1962 to 23 October 19621963: 14 January 1963 to 28 October 19631964: 15 January 1964 to 22 November 19641965: 9 May 1965 to 13 December 19651966: 14 February 1966 to 13 December 19661967: 15 January 1967 to 30 December 19671968: 29 March 1968 to 24 December 19681969: 10 February 1969 to 2 December 19691970: 3 January 1970 to 5 December 19701971: 15 March 1971 to 10 December 19711972: 17 February 1972 to 10 November 19721973: 31 January 1973 to 30 December 19731974: 14 January 1974 to 31 October 19741975: 15 March 1975 to 29 December 19751976: 29 February 1976 to 30 November 19761977: 15 January 1977 to 29 November 19771978: 24 January 1978 to 17 December 19781979: 20 January 1979 to 15 November 19791980: 19 April 1980 to 12 October 19801981: 5 February 1981 to 28 October 19811982: 7 January 1982 to 9 September 19821983: 5 March 1983 to 31 December 19831984: 1 January 1984 to 11 November 19841985: 16 March 1985 to 10 December 19851986: 17 April 1986 to 17 December 19861987: 20 February 1987 to 2 December 19871988: 1 January 1988 to 25 December 19881989: 14 February 1989 to 17 November 19891990: 2 February 1990 to 10 December 19901991: 5 January 1991 to 20 December 19911992: 6 February 1992 to 22 December 19921993: 25 January 1993 to 15 December 19931994: 6 January 1994 to 7 October 19941995: 6 January 1995 to 4 December 19951996: 9 February 1996 to 7 December 19961997: 22 January 1997 to 11 November 19971998: 8 February 1998 to 20 December 19981999: 29 January 1999 to 27 December 19992000: 23 March 2000 to 23 December 20002001: 13 February 2001 to 7 December 20012002: 8 February 2002 to 31 December 20022003: 21 February 2003 to 22 December 20032004: 29 March 2004 to 12 November 20042005: 4 January 2005 to 2 December 20052006: 29 January 2006 to 6 September 20062007: 1 January 2007 to 22 December 20072008: 19 January 2008 to 13 December 20082009: 14 March 2009 to 18 December 200919491957196519731981198919972005JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rocklands Reservoir meeting 10 mm (0.39 in).
First to last qualifying date each year at Rocklands Reservoir
YearFirst dateLast date
19491949-02-201949-11-22
19501950-02-151950-12-20
19511951-02-191951-12-10
19521952-01-251952-11-16
19531953-04-041953-12-07
19541954-01-281954-12-12
19551955-04-141955-12-31
19561956-03-031956-10-17
19571957-02-071957-12-26
19581958-04-141958-11-21
19591959-01-251959-12-25
19601960-01-041960-12-28
19611961-04-071961-12-17
19621962-02-201962-10-23
19631963-01-141963-10-28
19641964-01-151964-11-22
19651965-05-091965-12-13
19661966-02-141966-12-13
19671967-01-151967-12-30
19681968-03-291968-12-24
19691969-02-101969-12-02
19701970-01-031970-12-05
19711971-03-151971-12-10
19721972-02-171972-11-10
19731973-01-311973-12-30
19741974-01-141974-10-31
19751975-03-151975-12-29
19761976-02-291976-11-30
19771977-01-151977-11-29
19781978-01-241978-12-17
19791979-01-201979-11-15
19801980-04-191980-10-12
19811981-02-051981-10-28
19821982-01-071982-09-09
19831983-03-051983-12-31
19841984-01-011984-11-11
19851985-03-161985-12-10
19861986-04-171986-12-17
19871987-02-201987-12-02
19881988-01-011988-12-25
19891989-02-141989-11-17
19901990-02-021990-12-10
19911991-01-051991-12-20
19921992-02-061992-12-22
19931993-01-251993-12-15
19941994-01-061994-10-07
19951995-01-061995-12-04
19961996-02-091996-12-07
19971997-01-221997-11-11
19981998-02-081998-12-20
19991999-01-291999-12-27
20002000-03-232000-12-23
20012001-02-132001-12-07
20022002-02-082002-12-31
20032003-02-212003-12-22
20042004-03-292004-11-12
20052005-01-042005-12-02
20062006-01-292006-09-06
20072007-01-012007-12-22
20082008-01-192008-12-13
20092009-03-142009-12-18

Every Fixed Threshold

Fixed thresholds at Rocklands Reservoir
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain6130196013
25 mm (0.98 in): Days with 25 mm or more rain52819792
50 mm (1.97 in): Days with 50 mm or more rain9119521
100 mm (3.94 in): Days with 100 mm or more rain2119521

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Rocklands Reservoir 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).