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Data as of 2025-12-31
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Built 2026-10-16 (16 October 2026)

Mt Tamalpais 1 S Weather Records (USC00045995)

Record envelope, standing records and threshold days for Mt Tamalpais 1 S (USC00045995), California, United States, with 54 years of record.

Key Facts for Mt Tamalpais 1 S

  • Mt Tamalpais 1 S (USC00045995) is a weather station in California, United States at 37.92 latitude and -122.57 longitude, 290 m (950 ft) above sea level.
  • The station reports from 1898 to 1951, 54 years of record.
  • 1,464 records set at Mt Tamalpais 1 S still stand.
  • Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

  • Location: California, United States, 37.92 latitude, -122.57 longitude.
  • Elevation: 290 m (950 ft).
  • Period of record: 1898 to 1951, 54 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Mt Tamalpais 1 S, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mt Tamalpais 1 S. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -10010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Mt Tamalpais 1 S. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Mt Tamalpais 1 S, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan21.1 C (70.0 F)-7.2 C (19.0 F)n/an/a
Feb22.2 C (72.0 F)-3.3 C (26.1 F)n/an/a
Mar25.0 C (77.0 F)-3.9 C (25.0 F)n/an/a
Apr28.3 C (82.9 F)-1.1 C (30.0 F)n/an/a
May31.7 C (89.1 F)-5.6 C (21.9 F)n/an/a
Jun33.3 C (91.9 F)3.3 C (37.9 F)n/an/a
Jul36.1 C (97.0 F)5.0 C (41.0 F)n/an/a
Aug37.2 C (99.0 F)7.2 C (45.0 F)n/an/a
Sep37.8 C (100.0 F)5.0 C (41.0 F)n/an/a
Oct31.7 C (89.1 F)0.6 C (33.1 F)n/an/a
Nov23.3 C (73.9 F)0.0 C (32.0 F)n/an/a
Dec19.4 C (66.9 F)-0.6 C (30.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Mt Tamalpais 1 S by the year they were set 1,464 records at Mt Tamalpais 1 S still stand. 1922 holds the most, with 264. 01002003001898: 1491921: 221922: 2641923: 951941: 1551942: 1691943: 1841944: 1791945: 1201946: 1271898192119221923194119421943194419451946
1,464 records at Mt Tamalpais 1 S still stand. 1922 holds the most, with 264.
Standing records at Mt Tamalpais 1 S by the year they were set
Year setStanding records
1898149
192122
1922264
192395
1941155
1942169
1943184
1944179
1945120
1946127

Wettest Day of Each Month

Dec: 146.1 mm (5.8 in)
Record daily precipitation for each month at Mt Tamalpais 1 S The wettest day on record for each calendar month at Mt Tamalpais 1 S. The most was 146.1 mm (5.8 in) on 23 December 1942. 050100150 Jan: 135.9 mm (5.4 in), 20 January 1943 Jan Feb: 143.3 mm (5.6 in), 4 February 1942 Feb Mar: 74.7 mm (2.9 in), 4 March 1951 Mar Apr: 53.3 mm (2.1 in), 4 April 1941 Apr May: 67.3 mm (2.6 in), 15 May 1898 May Jun: 19.8 mm (0.8 in), 1 June 1898 Jun Jul: 1.8 mm (0.07 in), 31 July 1949 Jul Aug: 5.8 mm (0.23 in), 28 August 1951 Aug Sep: 9.9 mm (0.39 in), 25 September 1898 Sep Oct: 47.2 mm (1.9 in), 31 October 1944 Oct Nov: 143.3 mm (5.6 in), 16 November 1942 Nov Dec: 146.1 mm (5.8 in), 23 December 1942 Dec
The wettest day on record for each calendar month at Mt Tamalpais 1 S. The most was 146.1 mm (5.8 in) on 23 December 1942.
Record daily precipitation for each month at Mt Tamalpais 1 S
MonthRecord daily precipitation (mm)Date
Jan135.9 mm (5.4 in)20 January 1943
Feb143.3 mm (5.6 in)4 February 1942
Mar74.7 mm (2.9 in)4 March 1951
Apr53.3 mm (2.1 in)4 April 1941
May67.3 mm (2.6 in)15 May 1898
Jun19.8 mm (0.8 in)1 June 1898
Jul1.8 mm (0.07 in)31 July 1949
Aug5.8 mm (0.23 in)28 August 1951
Sep9.9 mm (0.39 in)25 September 1898
Oct47.2 mm (1.9 in)31 October 1944
Nov143.3 mm (5.6 in)16 November 1942
Dec146.1 mm (5.8 in)23 December 1942

Period of Record Coverage

1898 to 1946
Days with data per year at Mt Tamalpais 1 S 10 years of record at Mt Tamalpais 1 S, 1898 to 1946. 5 years have data for under 90 percent of days and are left out of rankings: 1898, 1921, 1923, 1941, 1945. 1898: 237 of 365 days1921: 31 of 365 days1922: 362 of 365 days1923: 144 of 365 days1941: 303 of 365 days1942: 352 of 365 days1943: 360 of 365 days1944: 357 of 366 days1945: 328 of 365 days1946: 355 of 365 days1945
10 years of record at Mt Tamalpais 1 S, 1898 to 1946. 5 years have data for under 90 percent of days and are left out of rankings: 1898, 1921, 1923, 1941, 1945.
Days with data per year at Mt Tamalpais 1 S
YearDays with dataShare of yearComplete
189823765%No
1921318%No
192236299%Yes
192314439%No
194130383%No
194235296%Yes
194336099%Yes
194435798%Yes
194532890%No
194635597%Yes

Latest Records

0

No records were set at this station in the latest data.

Extremes by Year

1898 to 1951
Yearly extremes at Mt Tamalpais 1 S: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)37.8 C (100.0 F)194435.6 C (96.0 F)10
Coldest night (TNn)-7.2 C (19.0 F)1922-0.5 C (31.0 F)10
Wettest day (Rx1day)146.1 mm (5.8 in)194283.9 mm (3.3 in)14
Wettest five days (Rx5day)342.3 mm (13.5 in)1942142.6 mm (5.6 in)14
Longest dry spell (CDD)137 days194367 days14

Hottest day (TXx)

Hottest day (TXx) at Mt Tamalpais 1 S by year The hottest day of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 37.8 C (100.0 F) in 1944, marked on the chart; the median year is 35.6 C (96.0 F). 10203040190019101920193019401950Record: 37.8 C (100.0 F) in 1944
The hottest day of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 37.8 C (100.0 F) in 1944, marked on the chart; the median year is 35.6 C (96.0 F).
Hottest day (TXx) at Mt Tamalpais 1 S by year
YearHottest day (TXx)
189835.0 C (95.0 F)
192116.1 C (61.0 F)
192234.4 C (93.9 F)
192328.9 C (84.0 F)
194133.3 C (91.9 F)
194236.1 C (97.0 F)
194337.2 C (99.0 F)
194437.8 C (100.0 F)
194536.7 C (98.1 F)
194637.2 C (99.0 F)
1948n/a
1949n/a
1950n/a
1951n/a

Coldest night (TNn)

Coldest night (TNn) at Mt Tamalpais 1 S by year The coldest night of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is -7.2 C (19.0 F) in 1922, marked on the chart; the median year is -0.5 C (31.0 F). -7.5-5-2.502.5190019101920193019401950Record: -7.2 C (19.0 F) in 1922
The coldest night of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is -7.2 C (19.0 F) in 1922, marked on the chart; the median year is -0.5 C (31.0 F).
Coldest night (TNn) at Mt Tamalpais 1 S by year
YearColdest night (TNn)
1898-5.6 C (21.9 F)
19210.6 C (33.1 F)
1922-7.2 C (19.0 F)
1923-3.3 C (26.1 F)
19410.6 C (33.1 F)
1942-1.1 C (30.0 F)
1943-2.8 C (27.0 F)
19442.2 C (36.0 F)
19451.1 C (34.0 F)
19460.0 C (32.0 F)
1948n/a
1949n/a
1950n/a
1951n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Mt Tamalpais 1 S by year The wettest day of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 146.1 mm (5.8 in) in 1942, marked on the chart; the median year is 83.9 mm (3.3 in). 050100150190019101920193019401950Record: 146.1 mm (5.8 in) in 1942
The wettest day of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 146.1 mm (5.8 in) in 1942, marked on the chart; the median year is 83.9 mm (3.3 in).
Wettest day (Rx1day) at Mt Tamalpais 1 S by year
YearWettest day (Rx1day)
189867.3 mm (2.6 in)
192151.8 mm (2.0 in)
1922109.2 mm (4.3 in)
192326.7 mm (1.1 in)
194183.8 mm (3.3 in)
1942146.1 mm (5.8 in)
1943135.9 mm (5.4 in)
194464.0 mm (2.5 in)
1945106.2 mm (4.2 in)
194671.9 mm (2.8 in)
194884.1 mm (3.3 in)
194958.4 mm (2.3 in)
1950113.0 mm (4.4 in)
1951117.3 mm (4.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mt Tamalpais 1 S by year The wettest five days of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 342.3 mm (13.5 in) in 1942, marked on the chart; the median year is 142.6 mm (5.6 in). 0100200300400190019101920193019401950Record: 342.3 mm (13.5 in) in 1942
The wettest five days of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 342.3 mm (13.5 in) in 1942, marked on the chart; the median year is 142.6 mm (5.6 in).
Wettest five days (Rx5day) at Mt Tamalpais 1 S by year
YearWettest five days (Rx5day)
189887.3 mm (3.4 in)
1921162.0 mm (6.4 in)
1922123.1 mm (4.8 in)
192364.3 mm (2.5 in)
1941219.3 mm (8.6 in)
1942342.3 mm (13.5 in)
1943276.1 mm (10.9 in)
1944122.5 mm (4.8 in)
1945240.3 mm (9.5 in)
194683.6 mm (3.3 in)
1948121.2 mm (4.8 in)
194987.9 mm (3.5 in)
1950284.5 mm (11.2 in)
1951172.7 mm (6.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mt Tamalpais 1 S by year The longest dry spell of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 137 days in 1943, marked on the chart; the median year is 67 days. 050100150190019101920193019401950Record: 137 days in 1943
The longest dry spell of the year at Mt Tamalpais 1 S, 1898 to 1951. The record is 137 days in 1943, marked on the chart; the median year is 67 days.
Longest dry spell (CDD) at Mt Tamalpais 1 S by year
YearLongest dry spell (CDD)
189836 days
192110 days
1922104 days
192317 days
194139 days
1942103 days
1943137 days
1944118 days
1945110 days
194660 days
194829 days
194968 days
1950114 days
195166 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

  • Data for Mt Tamalpais 1 S standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).