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Built 2026-10-18 (18 October 2026)

South Pass City Threshold Days by Year

15 fixed thresholds counted per year at South Pass City (USC00488385): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for South Pass City Thresholds

  • South Pass City: days with 10 mm (0.39 in) or more of precipitation in 79 years, most in 1993 with 19.
  • South Pass City: days with a maximum temperature at or below 0 C (32 F) in 72 years, most in 1945 with 130.
  • South Pass City: nights with a minimum temperature at or below 0 C (32 F) in 68 years, most in 1978 with 321.
  • South Pass City: nights with a minimum temperature at or below -10 C (14 F) in 68 years, most in 1923 with 155.
  • 15 fixed thresholds have at least one qualifying day at South Pass City.
38 years with a qualifying day
Days at or above 30 C (86 F) per year at South Pass City Days per year at South Pass City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 12 in 1940. 0510151901: 31904: 61906: 71911: 31918: 11919: 21921: 11923: 11925: 21926: 11929: 21931: 101933: 11934: 11935: 11939: 21940: 121941: 11942: 21943: 21951: 11966: 11968: 11969: 21970: 11971: 11976: 51977: 41979: 21994: 11996: 22000: 22001: 62002: 102003: 122006: 102007: 102010: 11901191819251933194019511970197920012007
Days per year at South Pass City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 12 in 1940.
Days at or above 30 C (86 F) per year at South Pass City
YearDaysDecade average
190135.3
190465.3
190675.3
191132
191812
191922
192111.4
192311.4
192521.4
192611.4
192921.4
1931103
193313
193413
193513
193923
1940124.3
194114.3
194224.3
194324.3
195111
196611.3
196811.3
196921.3
197012.6
197112.6
197652.6
197742.6
197922.6
199411.5
199621.5
200028.3
200168.3
2002108.3
2003128.3
2006108.3
2007108.3
201011
First to last qualifying date each year at South Pass City For each year, a bar from the first to the last day at South Pass City meeting 30 C (86 F). 1901: 22 July 1901 to 13 August 19011904: 22 July 1904 to 7 September 19041906: 20 July 1906 to 17 August 19061911: 11 June 1911 to 13 June 19111918: 31 July 1918 to 31 July 19181919: 10 July 1919 to 25 August 19191921: 20 July 1921 to 20 July 19211923: 22 July 1923 to 22 July 19231925: 13 July 1925 to 14 July 19251926: 31 July 1926 to 31 July 19261929: 11 August 1929 to 26 August 19291931: 18 July 1931 to 11 August 19311933: 25 July 1933 to 25 July 19331934: 18 July 1934 to 18 July 19341935: 27 July 1935 to 27 July 19351939: 9 July 1939 to 12 July 19391940: 18 June 1940 to 14 August 19401941: 4 August 1941 to 4 August 19411942: 5 July 1942 to 22 July 19421943: 25 July 1943 to 26 July 19431951: 25 July 1951 to 25 July 19511966: 28 June 1966 to 28 June 19661968: 7 August 1968 to 7 August 19681969: 10 August 1969 to 25 August 19691970: 25 June 1970 to 25 June 19701971: 15 August 1971 to 15 August 19711976: 6 July 1976 to 11 July 19761977: 4 June 1977 to 19 July 19771979: 4 August 1979 to 5 August 19791994: 23 July 1994 to 23 July 19941996: 24 June 1996 to 13 August 19962000: 24 July 2000 to 2 August 20002001: 1 July 2001 to 7 August 20012002: 26 June 2002 to 16 July 20022003: 15 July 2003 to 15 August 20032006: 16 July 2006 to 30 July 20062007: 3 July 2007 to 15 August 20072010: 1 August 2010 to 1 August 201019011919192919391951197119962006JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at South Pass City meeting 30 C (86 F).
First to last qualifying date each year at South Pass City
YearFirst dateLast date
19011901-07-221901-08-13
19041904-07-221904-09-07
19061906-07-201906-08-17
19111911-06-111911-06-13
19181918-07-311918-07-31
19191919-07-101919-08-25
19211921-07-201921-07-20
19231923-07-221923-07-22
19251925-07-131925-07-14
19261926-07-311926-07-31
19291929-08-111929-08-26
19311931-07-181931-08-11
19331933-07-251933-07-25
19341934-07-181934-07-18
19351935-07-271935-07-27
19391939-07-091939-07-12
19401940-06-181940-08-14
19411941-08-041941-08-04
19421942-07-051942-07-22
19431943-07-251943-07-26
19511951-07-251951-07-25
19661966-06-281966-06-28
19681968-08-071968-08-07
19691969-08-101969-08-25
19701970-06-251970-06-25
19711971-08-151971-08-15
19761976-07-061976-07-11
19771977-06-041977-07-19
19791979-08-041979-08-05
19941994-07-231994-07-23
19961996-06-241996-08-13
20002000-07-242000-08-02
20012001-07-012001-08-07
20022002-06-262002-07-16
20032003-07-152003-08-15
20062006-07-162006-07-30
20072007-07-032007-08-15
20102010-08-012010-08-01

Every Fixed Threshold

Fixed thresholds at South Pass City
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days381219401
35 C (95 F): Days3119011
90 F (32.2 C): Days10419311
0 C (32 F): Ice days (max72130194590
0 C (32 F): Frost days (min683211978262
-10 C (14 F): Days with min681551923123
-20 C (-4 F): Days with min6860193228
-30 C (-22 F): Days with min591219301
-40 C (-40 F): Days with min5119221
10 mm (0.39 in): Days with 10 mm or more rain7919199315
25 mm (0.98 in): Days with 25 mm or more rain38319502
50 mm (1.97 in): Days with 50 mm or more rain10n/a1
10 cm (3.9 in): Days with 10 cm or more snowfall6821194514
25 cm (9.8 in): Days with 25 cm or more snowfall37619572
50 cm (19.7 in): Days with 50 cm or more snowfall4119321

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

  • Data for South Pass City 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).