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Built 2026-10-19 (19 October 2026)

Alta Threshold Days by Year (USC00420072)

13 fixed thresholds counted per year at Alta (USC00420072): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alta Thresholds

  • Alta: days with a maximum temperature at or below 0 C (32 F) in 50 years, most in 1979 with 116.
  • Alta: nights with a minimum temperature at or below 0 C (32 F) in 50 years, most in 1982 with 238.
  • Alta: nights with a minimum temperature at or below -10 C (14 F) in 50 years, most in 1979 with 100.
  • Alta: days with 10 mm (0.39 in) or more of precipitation in 49 years, most in 1983 with 89.
  • 13 fixed thresholds have at least one qualifying day at Alta.
50 years with a qualifying day
Nights at or below 0 C (32 F) per year at Alta Days per year at Alta with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 238 in 1982. 01002003001946: 2091971: 2301972: 2101973: 1921974: 1851975: 2181976: 1981979: 2181980: 2101981: 2141982: 2381983: 2131984: 2271985: 2141987: 1811988: 1951989: 1981990: 1991991: 2111992: 1891993: 2241994: 1781995: 2171996: 2021997: 1971998: 2071999: 2102000: 2022002: 2062003: 1932004: 1692005: 2102006: 2042008: 2162009: 2022012: 1862013: 2022014: 1892015: 1832016: 1922017: 2022018: 2032019: 2302020: 1992021: 2152022: 2062023: 1912024: 1982025: 1832026: 1121946197519821988199319982004201220172022
Days per year at Alta with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 238 in 1982.
Nights at or below 0 C (32 F) per year at Alta
YearDaysDecade average
1946209209
1971230207.3
1972210207.3
1973192207.3
1974185207.3
1975218207.3
1976198207.3
1979218207.3
1980210210
1981214210
1982238210
1983213210
1984227210
1985214210
1987181210
1988195210
1989198210
1990199203.4
1991211203.4
1992189203.4
1993224203.4
1994178203.4
1995217203.4
1996202203.4
1997197203.4
1998207203.4
1999210203.4
2000202200.3
2002206200.3
2003193200.3
2004169200.3
2005210200.3
2006204200.3
2008216200.3
2009202200.3
2012186198.4
2013202198.4
2014189198.4
2015183198.4
2016192198.4
2017202198.4
2018203198.4
2019230198.4
2020199186.3
2021215186.3
2022206186.3
2023191186.3
2024198186.3
2025183186.3
2026112186.3
First to last qualifying date each year at Alta For each year, a bar from the first to the last day at Alta meeting 0 C (32 F). 1946: 1 January 1946 to 31 December 19461971: 1 January 1971 to 31 December 19711972: 1 January 1972 to 31 December 19721973: 1 January 1973 to 30 November 19731974: 1 February 1974 to 31 December 19741975: 1 January 1975 to 31 December 19751976: 1 January 1976 to 31 December 19761979: 1 January 1979 to 31 December 19791980: 1 January 1980 to 31 December 19801981: 1 January 1981 to 31 December 19811982: 1 January 1982 to 31 December 19821983: 1 January 1983 to 31 December 19831984: 1 January 1984 to 31 December 19841985: 1 January 1985 to 31 December 19851987: 1 January 1987 to 31 December 19871988: 1 January 1988 to 31 December 19881989: 1 January 1989 to 31 December 19891990: 1 January 1990 to 31 December 19901991: 1 January 1991 to 31 December 19911992: 1 January 1992 to 31 December 19921993: 1 January 1993 to 31 December 19931994: 1 January 1994 to 31 December 19941995: 1 January 1995 to 31 December 19951996: 1 January 1996 to 31 December 19961997: 1 January 1997 to 31 December 19971998: 1 January 1998 to 31 December 19981999: 1 January 1999 to 31 December 19992000: 1 January 2000 to 31 December 20002002: 1 January 2002 to 31 December 20022003: 1 January 2003 to 31 December 20032004: 1 January 2004 to 30 November 20042005: 1 January 2005 to 31 December 20052006: 1 January 2006 to 31 December 20062008: 1 January 2008 to 31 December 20082009: 1 January 2009 to 31 December 20092012: 1 January 2012 to 31 December 20122013: 1 January 2013 to 31 December 20132014: 1 January 2014 to 31 December 20142015: 1 January 2015 to 31 December 20152016: 1 January 2016 to 31 December 20162017: 1 January 2017 to 31 December 20172018: 1 January 2018 to 30 December 20182019: 1 January 2019 to 31 December 20192020: 1 January 2020 to 31 December 20202021: 1 January 2021 to 31 December 20212022: 1 January 2022 to 31 December 20222023: 1 January 2023 to 31 December 20232024: 1 January 2024 to 31 December 20242025: 1 January 2025 to 31 December 20252026: 1 January 2026 to 14 October 202619461979198719942002201220192026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Alta meeting 0 C (32 F).
First to last qualifying date each year at Alta
YearFirst dateLast date
19461946-01-011946-12-31
19711971-01-011971-12-31
19721972-01-011972-12-31
19731973-01-011973-11-30
19741974-02-011974-12-31
19751975-01-011975-12-31
19761976-01-011976-12-31
19791979-01-011979-12-31
19801980-01-011980-12-31
19811981-01-011981-12-31
19821982-01-011982-12-31
19831983-01-011983-12-31
19841984-01-011984-12-31
19851985-01-011985-12-31
19871987-01-011987-12-31
19881988-01-011988-12-31
19891989-01-011989-12-31
19901990-01-011990-12-31
19911991-01-011991-12-31
19921992-01-011992-12-31
19931993-01-011993-12-31
19941994-01-011994-12-31
19951995-01-011995-12-31
19961996-01-011996-12-31
19971997-01-011997-12-31
19981998-01-011998-12-31
19991999-01-011999-12-31
20002000-01-012000-12-31
20022002-01-012002-12-31
20032003-01-012003-12-31
20042004-01-012004-11-30
20052005-01-012005-12-31
20062006-01-012006-12-31
20082008-01-012008-12-31
20092009-01-012009-12-31
20122012-01-012012-12-31
20132013-01-012013-12-31
20142014-01-012014-12-31
20152015-01-012015-12-31
20162016-01-012016-12-31
20172017-01-012017-12-31
20182018-01-012018-12-30
20192019-01-012019-12-31
20202020-01-012020-12-31
20212021-01-012021-12-31
20222022-01-012022-12-31
20232023-01-012023-12-31
20242024-01-012024-12-31
20252025-01-012025-12-31
20262026-01-012026-10-14

Every Fixed Threshold

Fixed thresholds at Alta
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2120021
0 C (32 F): Ice days (max50116197920
0 C (32 F): Frost days (min502381982112
-10 C (14 F): Days with min50100197916
-20 C (-4 F): Days with min431919794
-30 C (-22 F): Days with min2319791
10 mm (0.39 in): Days with 10 mm or more rain4989198330
25 mm (0.98 in): Days with 25 mm or more rain4935198313
50 mm (1.97 in): Days with 50 mm or more rain34819823
100 mm (3.94 in): Days with 100 mm or more rain3119461
10 cm (3.9 in): Days with 10 cm or more snowfall4976198318
25 cm (9.8 in): Days with 25 cm or more snowfall493219835
50 cm (19.7 in): Days with 50 cm or more snowfall40619952

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2002.

Download the Data

  • Data for Alta 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).