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

Mt Tamalpais 1 S Threshold Days by Year

12 fixed thresholds counted per year at Mt Tamalpais 1 S (USC00045995): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mt Tamalpais 1 S Thresholds

  • Mt Tamalpais 1 S: days with 10 mm (0.39 in) or more of precipitation in 8 years, most in 1922 with 39.
  • Mt Tamalpais 1 S: days with 25 mm (0.98 in) or more of precipitation in 8 years, most in 1942 with 21.
  • Mt Tamalpais 1 S: days with 50 mm (1.97 in) or more of precipitation in 8 years, most in 1942 with 8.
  • Mt Tamalpais 1 S: days with a maximum temperature at or above 30 C (86 F) in 5 years, most in 1922 with 26.
  • 12 fixed thresholds have at least one qualifying day at Mt Tamalpais 1 S.
5 years with a qualifying day
Days at or above 30 C (86 F) per year at Mt Tamalpais 1 S Days per year at Mt Tamalpais 1 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 26 in 1922. 01020301922: 261942: 211943: 251944: 221946: 1719221942194319441946
Days per year at Mt Tamalpais 1 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 26 in 1922.
Days at or above 30 C (86 F) per year at Mt Tamalpais 1 S
YearDaysDecade average
19222626
19422121.3
19432521.3
19442221.3
19461721.3
First to last qualifying date each year at Mt Tamalpais 1 S For each year, a bar from the first to the last day at Mt Tamalpais 1 S meeting 30 C (86 F). 1922: 17 June 1922 to 19 September 19221942: 28 June 1942 to 4 October 19421943: 22 May 1943 to 5 October 19431944: 6 July 1944 to 27 September 19441946: 19 June 1946 to 28 September 194619221942194319441946JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mt Tamalpais 1 S meeting 30 C (86 F).
First to last qualifying date each year at Mt Tamalpais 1 S
YearFirst dateLast date
19221922-06-171922-09-19
19421942-06-281942-10-04
19431943-05-221943-10-05
19441944-07-061944-09-27
19461946-06-191946-09-28

Every Fixed Threshold

Fixed thresholds at Mt Tamalpais 1 S
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days526192217
35 C (95 F): Days41019442
90 F (32.2 C): Days51419448
100 F (37.8 C): Days1219442
0 C (32 F): Ice days (max1119221
0 C (32 F): Frost days (min43619221
20 C (68 F): Tropical nights (min544192223
25 C (77 F): Days with min51219221
10 mm (0.39 in): Days with 10 mm or more rain839192231
25 mm (0.98 in): Days with 25 mm or more rain821194219
50 mm (1.97 in): Days with 50 mm or more rain8819427
100 mm (3.94 in): Days with 100 mm or more rain5419422

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1922.

Download the Data

  • Data for Mt Tamalpais 1 S 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).