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

Altapass Threshold Days by Year (USC00310160)

14 fixed thresholds counted per year at Altapass (USC00310160): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Altapass Thresholds

  • Altapass: days with 10 mm (0.39 in) or more of precipitation in 25 years, most in 1921 with 56.
  • Altapass: days with 25 mm (0.98 in) or more of precipitation in 25 years, most in 1961 with 19.
  • Altapass: days with 50 mm (1.97 in) or more of precipitation in 21 years, most in 1957 with 7.
  • Altapass: days with a maximum temperature at or below 0 C (32 F) in 14 years, most in 1917 with 18.
  • 14 fixed thresholds have at least one qualifying day at Altapass.
13 years with a qualifying day
Days at or above 30 C (86 F) per year at Altapass Days per year at Altapass with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 22 in 1913. 01020301913: 221917: 21918: 171921: 11922: 11923: 11925: 211926: 41930: 141931: 61932: 201933: 101935: 211913191819221925193019321935
Days per year at Altapass with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 22 in 1913.
Days at or above 30 C (86 F) per year at Altapass
YearDaysDecade average
19132213.7
1917213.7
19181713.7
192115.6
192215.6
192315.6
1925215.6
192645.6
19301414.2
1931614.2
19322014.2
19331014.2
19352114.2
First to last qualifying date each year at Altapass For each year, a bar from the first to the last day at Altapass meeting 30 C (86 F). 1913: 14 May 1913 to 28 August 19131917: 25 June 1917 to 28 June 19171918: 28 May 1918 to 13 August 19181921: 14 June 1921 to 14 June 19211922: 14 April 1922 to 14 April 19221923: 25 July 1923 to 25 July 19231925: 24 April 1925 to 21 September 19251926: 19 July 1926 to 23 July 19261930: 11 April 1930 to 9 August 19301931: 28 June 1931 to 23 September 19311932: 11 July 1932 to 2 September 19321933: 7 June 1933 to 2 August 19331935: 21 June 1935 to 14 August 19351913191819221925193019321935JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Altapass meeting 30 C (86 F).
First to last qualifying date each year at Altapass
YearFirst dateLast date
19131913-05-141913-08-28
19171917-06-251917-06-28
19181918-05-281918-08-13
19211921-06-141921-06-14
19221922-04-141922-04-14
19231923-07-251923-07-25
19251925-04-241925-09-21
19261926-07-191926-07-23
19301930-04-111930-08-09
19311931-06-281931-09-23
19321932-07-111932-09-02
19331933-06-071933-08-02
19351935-06-211935-08-14

Every Fixed Threshold

Fixed thresholds at Altapass
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1322191321
90 F (32.2 C): Days6519131
0 C (32 F): Ice days (max141819173
0 C (32 F): Frost days (min14154191891
-10 C (14 F): Days with min1434191710
-20 C (-4 F): Days with min4719171
20 C (68 F): Tropical nights (min6319221
10 mm (0.39 in): Days with 10 mm or more rain2556192150
25 mm (0.98 in): Days with 25 mm or more rain2519196119
50 mm (1.97 in): Days with 50 mm or more rain21719575
100 mm (3.94 in): Days with 100 mm or more rain7119181
200 mm (7.87 in): Days with 200 mm or more rain10n/a1
10 cm (3.9 in): Days with 10 cm or more snowfall11419213
25 cm (9.8 in): Days with 25 cm or more snowfall5219211

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1913.

Download the Data

  • Data for Altapass 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).