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

Ross Threshold Days by Year (USC00417768)

5 fixed thresholds counted per year at Ross (USC00417768): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ross Thresholds

  • Ross: days with 10 mm (0.39 in) or more of precipitation in 23 years, most in 1973 with 39.
  • Ross: days with 25 mm (0.98 in) or more of precipitation in 23 years, most in 1973 with 20.
  • Ross: days with 50 mm (1.97 in) or more of precipitation in 20 years, most in 1965 with 8.
  • Ross: days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1958 with 2.
  • 5 fixed thresholds have at least one qualifying day at Ross.
23 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ross Days per year at Ross with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 39 in 1973. 0102030401941: 281942: 321943: 251944: 331945: 311946: 331947: 261948: 201949: 201952: 231956: 121958: 241959: 341963: 201964: 201965: 301966: 281968: 321969: 291970: 301971: 231973: 391974: 2619411944194719521959196519691973
Days per year at Ross with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 39 in 1973.
Days with 10 mm (0.39 in) or more of precipitation per year at Ross
YearDaysDecade average
19412827.6
19423227.6
19432527.6
19443327.6
19453127.6
19463327.6
19472627.6
19482027.6
19492027.6
19522323.3
19561223.3
19582423.3
19593423.3
19632026.5
19642026.5
19653026.5
19662826.5
19683226.5
19692926.5
19703029.5
19712329.5
19733929.5
19742629.5
First to last qualifying date each year at Ross For each year, a bar from the first to the last day at Ross meeting 10 mm (0.39 in). 1941: 13 January 1941 to 11 December 19411942: 16 February 1942 to 26 December 19421943: 24 March 1943 to 27 December 19431944: 1 January 1944 to 31 December 19441945: 17 January 1945 to 9 November 19451946: 5 January 1946 to 13 December 19461947: 9 January 1947 to 15 December 19471948: 1 January 1948 to 18 December 19481949: 16 January 1949 to 17 December 19491952: 11 February 1952 to 30 December 19521956: 18 January 1956 to 19 December 19561958: 10 February 1958 to 21 December 19581959: 3 January 1959 to 31 December 19591963: 5 January 1963 to 10 December 19631964: 16 January 1964 to 9 December 19641965: 2 January 1965 to 18 December 19651966: 28 January 1966 to 30 December 19661968: 8 January 1968 to 30 November 19681969: 31 January 1969 to 29 December 19691970: 5 January 1970 to 30 December 19701971: 21 February 1971 to 15 December 19711973: 3 January 1973 to 19 December 19731974: 24 January 1974 to 11 December 197419411944194719521959196519691973JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ross meeting 10 mm (0.39 in).
First to last qualifying date each year at Ross
YearFirst dateLast date
19411941-01-131941-12-11
19421942-02-161942-12-26
19431943-03-241943-12-27
19441944-01-011944-12-31
19451945-01-171945-11-09
19461946-01-051946-12-13
19471947-01-091947-12-15
19481948-01-011948-12-18
19491949-01-161949-12-17
19521952-02-111952-12-30
19561956-01-181956-12-19
19581958-02-101958-12-21
19591959-01-031959-12-31
19631963-01-051963-12-10
19641964-01-161964-12-09
19651965-01-021965-12-18
19661966-01-281966-12-30
19681968-01-081968-11-30
19691969-01-311969-12-29
19701970-01-051970-12-30
19711971-02-211971-12-15
19731973-01-031973-12-19
19741974-01-241974-12-11

Every Fixed Threshold

Fixed thresholds at Ross
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2339197326
25 mm (0.98 in): Days with 25 mm or more rain2320197313
50 mm (1.97 in): Days with 50 mm or more rain20819655
100 mm (3.94 in): Days with 100 mm or more rain6219581
10 cm (3.9 in): Days with 10 cm or more snowfall3119441

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for Ross 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).