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Built 2026-10-19 (19 October 2026)

Ross Dam Threshold Days by Year (USC00457185)

16 fixed thresholds counted per year at Ross Dam (USC00457185): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ross Dam Thresholds

  • Ross Dam: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1990 with 68.
  • Ross Dam: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 2014 with 26.
  • Ross Dam: nights with a minimum temperature at or below 0 C (32 F) in 64 years, most in 1985 with 116.
  • Ross Dam: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 2022 with 38.
  • 16 fixed thresholds have at least one qualifying day at Ross Dam.
62 years with a qualifying day
Days at or above 30 C (86 F) per year at Ross Dam Days per year at Ross Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2022. 0102030401961: 341963: 101964: 71965: 181966: 61967: 291969: 161970: 231971: 221972: 111973: 171974: 191975: 151976: 21977: 251978: 151979: 131980: 61981: 201982: 141983: 81985: 241986: 231987: 251988: 211989: 111990: 241991: 181992: 261993: 81994: 141995: 151996: 261997: 151998: 281999: 82000: 92001: 142002: 182003: 342004: 272005: 252006: 362007: 212008: 162010: 162011: 122012: 172013: 172014: 242015: 342016: 222017: 372018: 362019: 162020: 202021: 372022: 382023: 362024: 302025: 342026: 29196119701977198519921999200620142021
Days per year at Ross Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2022.
Days at or above 30 C (86 F) per year at Ross Dam
YearDaysDecade average
19613417.1
19631017.1
1964717.1
19651817.1
1966617.1
19672917.1
19691617.1
19702316.2
19712216.2
19721116.2
19731716.2
19741916.2
19751516.2
1976216.2
19772516.2
19781516.2
19791316.2
1980616.9
19812016.9
19821416.9
1983816.9
19852416.9
19862316.9
19872516.9
19882116.9
19891116.9
19902418.2
19911818.2
19922618.2
1993818.2
19941418.2
19951518.2
19962618.2
19971518.2
19982818.2
1999818.2
2000922.2
20011422.2
20021822.2
20033422.2
20042722.2
20052522.2
20063622.2
20072122.2
20081622.2
20101623.1
20111223.1
20121723.1
20131723.1
20142423.1
20153423.1
20162223.1
20173723.1
20183623.1
20191623.1
20202032
20213732
20223832
20233632
20243032
20253432
20262932
First to last qualifying date each year at Ross Dam For each year, a bar from the first to the last day at Ross Dam meeting 30 C (86 F). 1961: 2 June 1961 to 23 August 19611963: 21 May 1963 to 10 September 19631964: 8 July 1964 to 12 August 19641965: 1 July 1965 to 19 August 19651966: 16 June 1966 to 5 September 19661967: 16 June 1967 to 1 September 19671969: 22 May 1969 to 10 September 19691970: 2 June 1970 to 31 August 19701971: 22 June 1971 to 30 August 19711972: 6 July 1972 to 29 August 19721973: 15 May 1973 to 11 September 19731974: 13 June 1974 to 15 September 19741975: 2 June 1975 to 23 September 19751976: 29 June 1976 to 16 July 19761977: 7 June 1977 to 21 August 19771978: 3 June 1978 to 10 August 19781979: 3 June 1979 to 13 August 19791980: 8 July 1980 to 12 August 19801981: 4 July 1981 to 9 September 19811982: 12 June 1982 to 3 September 19821983: 25 May 1983 to 5 August 19831985: 19 June 1985 to 25 August 19851986: 30 May 1986 to 28 August 19861987: 9 May 1987 to 8 September 19871988: 13 May 1988 to 15 September 19881989: 5 June 1989 to 24 September 19891990: 22 June 1990 to 13 August 19901991: 3 July 1991 to 12 October 19911992: 5 May 1992 to 19 August 19921993: 19 May 1993 to 10 September 19931994: 14 July 1994 to 24 September 19941995: 29 June 1995 to 24 September 19951996: 8 July 1996 to 30 August 19961997: 5 July 1997 to 23 August 19971998: 1 July 1998 to 16 September 19981999: 25 May 1999 to 22 September 19992000: 27 June 2000 to 24 August 20002001: 23 May 2001 to 27 August 20012002: 13 June 2002 to 14 September 20022003: 7 June 2003 to 7 September 20032004: 20 June 2004 to 20 August 20042005: 28 May 2005 to 27 August 20052006: 17 May 2006 to 5 September 20062007: 31 May 2007 to 13 September 20072008: 18 May 2008 to 18 August 20082010: 8 July 2010 to 26 August 20102011: 25 July 2011 to 12 September 20112012: 7 July 2012 to 9 September 20122013: 1 July 2013 to 23 August 20132014: 2 July 2014 to 28 August 20142015: 7 June 2015 to 29 August 20152016: 5 June 2016 to 27 August 20162017: 23 May 2017 to 12 September 20172018: 15 May 2018 to 7 September 20182019: 12 June 2019 to 7 September 20192020: 30 May 2020 to 11 September 20202021: 2 June 2021 to 8 September 20212022: 26 June 2022 to 12 September 20222023: 15 May 2023 to 17 September 20232024: 9 June 2024 to 6 September 20242025: 29 May 2025 to 17 September 20252026: 13 May 2026 to 26 August 202619611971197919881996200420132021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ross Dam meeting 30 C (86 F).
First to last qualifying date each year at Ross Dam
YearFirst dateLast date
19611961-06-021961-08-23
19631963-05-211963-09-10
19641964-07-081964-08-12
19651965-07-011965-08-19
19661966-06-161966-09-05
19671967-06-161967-09-01
19691969-05-221969-09-10
19701970-06-021970-08-31
19711971-06-221971-08-30
19721972-07-061972-08-29
19731973-05-151973-09-11
19741974-06-131974-09-15
19751975-06-021975-09-23
19761976-06-291976-07-16
19771977-06-071977-08-21
19781978-06-031978-08-10
19791979-06-031979-08-13
19801980-07-081980-08-12
19811981-07-041981-09-09
19821982-06-121982-09-03
19831983-05-251983-08-05
19851985-06-191985-08-25
19861986-05-301986-08-28
19871987-05-091987-09-08
19881988-05-131988-09-15
19891989-06-051989-09-24
19901990-06-221990-08-13
19911991-07-031991-10-12
19921992-05-051992-08-19
19931993-05-191993-09-10
19941994-07-141994-09-24
19951995-06-291995-09-24
19961996-07-081996-08-30
19971997-07-051997-08-23
19981998-07-011998-09-16
19991999-05-251999-09-22
20002000-06-272000-08-24
20012001-05-232001-08-27
20022002-06-132002-09-14
20032003-06-072003-09-07
20042004-06-202004-08-20
20052005-05-282005-08-27
20062006-05-172006-09-05
20072007-05-312007-09-13
20082008-05-182008-08-18
20102010-07-082010-08-26
20112011-07-252011-09-12
20122012-07-072012-09-09
20132013-07-012013-08-23
20142014-07-022014-08-28
20152015-06-072015-08-29
20162016-06-052016-08-27
20172017-05-232017-09-12
20182018-05-152018-09-07
20192019-06-122019-09-07
20202020-05-302020-09-11
20212021-06-022021-09-08
20222022-06-262022-09-12
20232023-05-152023-09-17
20242024-06-092024-09-06
20252025-05-292025-09-17
20262026-05-132026-08-26

Every Fixed Threshold

Fixed thresholds at Ross Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days6238202229
35 C (95 F): Days481220222
40 C (104 F): Days1320213
90 F (32.2 C): Days6022201815
100 F (37.8 C): Days19520211
0 C (32 F): Ice days (max622719962
0 C (32 F): Frost days (min64116198544
-10 C (14 F): Days with min541419932
20 C (68 F): Tropical nights (min2220212
10 mm (0.39 in): Days with 10 mm or more rain6568199025
25 mm (0.98 in): Days with 25 mm or more rain652620148
50 mm (1.97 in): Days with 50 mm or more rain58719725
100 mm (3.94 in): Days with 100 mm or more rain9219951
10 cm (3.9 in): Days with 10 cm or more snowfall331420084
25 cm (9.8 in): Days with 25 cm or more snowfall21419904
50 cm (19.7 in): Days with 50 cm or more snowfall1119951

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.

Download the Data

  • Data for Ross 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 (2026-10-17).