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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

McRoss Threshold Days by Year

14 fixed thresholds counted per year at McRoss (USC00465871): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for McRoss Thresholds

  • McRoss: days with a maximum temperature at or below 0 C (32 F) in 31 years, most in 1985 with 53.
  • McRoss: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 1979 with 62.
  • McRoss: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1979 with 19.
  • McRoss: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 1987 with 169.
  • 14 fixed thresholds have at least one qualifying day at McRoss.
26 years with a qualifying day
Days at or above 30 C (86 F) per year at McRoss Days per year at McRoss with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 28 in 1988. 01020301956: 41957: 151958: 31959: 171960: 41961: 51962: 131963: 51964: 171965: 61966: 181967: 31968: 141969: 131970: 51971: 11973: 81975: 111976: 71977: 171978: 81980: 101981: 31984: 51987: 211988: 28195619591962196519681971197619801987
Days per year at McRoss with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 28 in 1988.
Days at or above 30 C (86 F) per year at McRoss
YearDaysDecade average
195649.8
1957159.8
195839.8
1959179.8
196049.8
196159.8
1962139.8
196359.8
1964179.8
196569.8
1966189.8
196739.8
1968149.8
1969139.8
197058.1
197118.1
197388.1
1975118.1
197678.1
1977178.1
197888.1
19801013.4
1981313.4
1984513.4
19872113.4
19882813.4
First to last qualifying date each year at McRoss For each year, a bar from the first to the last day at McRoss meeting 30 C (86 F). 1956: 30 June 1956 to 18 August 19561957: 26 April 1957 to 2 September 19571958: 13 June 1958 to 5 September 19581959: 28 June 1959 to 26 August 19591960: 23 April 1960 to 3 August 19601961: 2 June 1961 to 3 September 19611962: 18 May 1962 to 13 September 19621963: 9 May 1963 to 4 August 19631964: 21 June 1964 to 12 September 19641965: 24 July 1965 to 9 September 19651966: 8 May 1966 to 6 August 19661967: 15 June 1967 to 17 June 19671968: 25 June 1968 to 25 August 19681969: 7 May 1969 to 20 July 19691970: 15 July 1970 to 25 September 19701971: 28 June 1971 to 28 June 19711973: 13 July 1973 to 2 September 19731975: 1 August 1975 to 6 September 19751976: 17 April 1976 to 16 July 19761977: 6 July 1977 to 2 September 19771978: 27 June 1978 to 20 August 19781980: 16 July 1980 to 30 August 19801981: 16 June 1981 to 25 June 19811984: 8 June 1984 to 13 June 19841987: 22 July 1987 to 23 August 19871988: 15 June 1988 to 28 August 19881956196019641968197319781987JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at McRoss meeting 30 C (86 F).
First to last qualifying date each year at McRoss
YearFirst dateLast date
19561956-06-301956-08-18
19571957-04-261957-09-02
19581958-06-131958-09-05
19591959-06-281959-08-26
19601960-04-231960-08-03
19611961-06-021961-09-03
19621962-05-181962-09-13
19631963-05-091963-08-04
19641964-06-211964-09-12
19651965-07-241965-09-09
19661966-05-081966-08-06
19671967-06-151967-06-17
19681968-06-251968-08-25
19691969-05-071969-07-20
19701970-07-151970-09-25
19711971-06-281971-06-28
19731973-07-131973-09-02
19751975-08-011975-09-06
19761976-04-171976-07-16
19771977-07-061977-09-02
19781978-06-271978-08-20
19801980-07-161980-08-30
19811981-06-161981-06-25
19841984-06-081984-06-13
19871987-07-221987-08-23
19881988-06-151988-08-28

Every Fixed Threshold

Fixed thresholds at McRoss
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2628198828
35 C (95 F): Days1119881
90 F (32.2 C): Days11719887
0 C (32 F): Ice days (max3153198529
0 C (32 F): Frost days (min301691987169
-10 C (14 F): Days with min3055196817
-20 C (-4 F): Days with min281619773
-30 C (-22 F): Days with min2219772
20 C (68 F): Tropical nights (min9119561
10 mm (0.39 in): Days with 10 mm or more rain3162197932
25 mm (0.98 in): Days with 25 mm or more rain311919795
50 mm (1.97 in): Days with 50 mm or more rain25419561
10 cm (3.9 in): Days with 10 cm or more snowfall291119588
25 cm (9.8 in): Days with 25 cm or more snowfall7219631

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1956.

Download the Data

  • Data for McRoss 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).