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

Ust-USA Threshold Days by Year (RSM00023412)

12 fixed thresholds counted per year at Ust-USA (RSM00023412): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ust-USA Thresholds

  • Ust-USA: days with 10 mm (0.39 in) or more of precipitation in 87 years, most in 2007 with 21.
  • Ust-USA: nights with a minimum temperature at or below 0 C (32 F) in 84 years, most in 1978 with 262.
  • Ust-USA: nights with a minimum temperature at or below -10 C (14 F) in 84 years, most in 1998 with 173.
  • Ust-USA: nights with a minimum temperature at or below -20 C (-4 F) in 84 years, most in 1963 with 103.
  • 12 fixed thresholds have at least one qualifying day at Ust-USA.
28 years with a qualifying day
Days at or above 30 C (86 F) per year at Ust-USA Days per year at Ust-USA with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 10 in 1990. 0358101937: 11943: 31953: 21954: 41955: 11961: 11963: 31964: 51965: 11966: 11970: 11972: 11974: 91982: 21983: 11988: 41989: 61990: 101998: 32000: 32002: 22004: 52007: 62008: 32010: 12011: 22013: 42016: 11937195419631966197419881998200420102016
Days per year at Ust-USA with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 10 in 1990.
Days at or above 30 C (86 F) per year at Ust-USA
YearDaysDecade average
193711
194333
195322.3
195442.3
195512.3
196112.2
196332.2
196452.2
196512.2
196612.2
197013.7
197213.7
197493.7
198223.3
198313.3
198843.3
198963.3
1990106.5
199836.5
200033.8
200223.8
200453.8
200763.8
200833.8
201012
201122
201342
201612
First to last qualifying date each year at Ust-USA For each year, a bar from the first to the last day at Ust-USA meeting 30 C (86 F). 1937: 1 July 1937 to 1 July 19371943: 13 July 1943 to 15 July 19431953: 6 June 1953 to 7 June 19531954: 8 July 1954 to 21 July 19541955: 20 June 1955 to 20 June 19551961: 12 July 1961 to 12 July 19611963: 26 June 1963 to 29 June 19631964: 5 July 1964 to 13 July 19641965: 8 July 1965 to 8 July 19651966: 11 July 1966 to 11 July 19661970: 24 July 1970 to 24 July 19701972: 9 July 1972 to 9 July 19721974: 4 July 1974 to 26 July 19741982: 7 July 1982 to 9 July 19821983: 2 July 1983 to 2 July 19831988: 5 July 1988 to 15 July 19881989: 10 June 1989 to 20 July 19891990: 8 July 1990 to 17 July 19901998: 14 June 1998 to 1 August 19982000: 15 July 2000 to 17 July 20002002: 26 July 2002 to 27 July 20022004: 29 June 2004 to 19 July 20042007: 1 July 2007 to 16 July 20072008: 21 July 2008 to 23 July 20082010: 31 July 2010 to 31 July 20102011: 27 June 2011 to 28 June 20112013: 3 July 2013 to 23 July 20132016: 21 July 2016 to 21 July 20161937195519651974198920022010JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ust-USA meeting 30 C (86 F).
First to last qualifying date each year at Ust-USA
YearFirst dateLast date
19371937-07-011937-07-01
19431943-07-131943-07-15
19531953-06-061953-06-07
19541954-07-081954-07-21
19551955-06-201955-06-20
19611961-07-121961-07-12
19631963-06-261963-06-29
19641964-07-051964-07-13
19651965-07-081965-07-08
19661966-07-111966-07-11
19701970-07-241970-07-24
19721972-07-091972-07-09
19741974-07-041974-07-26
19821982-07-071982-07-09
19831983-07-021983-07-02
19881988-07-051988-07-15
19891989-06-101989-07-20
19901990-07-081990-07-17
19981998-06-141998-08-01
20002000-07-152000-07-17
20022002-07-262002-07-27
20042004-06-292004-07-19
20072007-07-012007-07-16
20082008-07-212008-07-23
20102010-07-312010-07-31
20112011-06-272011-06-28
20132013-07-032013-07-23
20162016-07-212016-07-21

Every Fixed Threshold

Fixed thresholds at Ust-USA
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days281019901
90 F (32.2 C): Days4619901
0 C (32 F): Ice days (max80192197856
0 C (32 F): Frost days (min84262197886
-10 C (14 F): Days with min84173199844
-20 C (-4 F): Days with min84103196311
-30 C (-22 F): Days with min845619982
-40 C (-40 F): Days with min561219794
20 C (68 F): Tropical nights (min15920071
10 mm (0.39 in): Days with 10 mm or more rain872120078
25 mm (0.98 in): Days with 25 mm or more rain34219431
50 mm (1.97 in): Days with 50 mm or more rain2120121

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1937.

Download the Data

  • Data for Ust-USA 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).