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Built 2026-10-17 (17 October 2026)

Black Mtn 2 WSW Weather Records (USC00040850)

Record envelope, standing records and threshold days for Black Mtn 2 WSW (USC00040850), California, United States, with 42 years of record.

Key Facts for Black Mtn 2 WSW

  • Black Mtn 2 WSW (USC00040850) is a weather station in California, United States at 37.32 latitude and -122.17 longitude, 646 m (2,120 ft) above sea level.
  • The station reports from 1954 to 1995, 42 years of record.
  • 0 records set at Black Mtn 2 WSW still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Black Mtn 2 WSW tied a daily record precipitation of 0.3 mm (0.01 in) on 17 June 1995.

About the Station

  • Location: California, United States, 37.32 latitude, -122.17 longitude.
  • Elevation: 646 m (2,120 ft).
  • Period of record: 1954 to 1995, 42 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Black Mtn 2 WSW, with 2026 drawn through them The band shows the record high and record low for each calendar day at Black Mtn 2 WSW. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Black Mtn 2 WSW. 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 Black Mtn 2 WSW, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Black Mtn 2 WSW by the year they were set 0 records at Black Mtn 2 WSW still stand. 00000000000
0 records at Black Mtn 2 WSW still stand.
Standing records at Black Mtn 2 WSW by the year they were set
Year setStanding records

Wettest Day of Each Month

Dec: 203.5 mm (8.0 in)
Record daily precipitation for each month at Black Mtn 2 WSW The wettest day on record for each calendar month at Black Mtn 2 WSW. The most was 203.5 mm (8.0 in) on 23 December 1955. 0100200300 Jan: 123.2 mm (4.9 in), 10 January 1995 Jan Feb: 116.8 mm (4.6 in), 13 February 1987 Feb Mar: 87.6 mm (3.4 in), 8 March 1986 Mar Apr: 171.5 mm (6.8 in), 4 April 1982 Apr May: 58.7 mm (2.3 in), 18 May 1957 May Jun: 29.5 mm (1.2 in), 9 June 1964 Jun Jul: 12.4 mm (0.5 in), 9 July 1974 Jul Aug: 14.0 mm (0.6 in), 19 August 1976 Aug Sep: 89.4 mm (3.5 in), 19 September 1959 Sep Oct: 118.1 mm (4.6 in), 13 October 1962 Oct Nov: 101.6 mm (4.0 in), 14 November 1981 Nov Dec: 203.5 mm (8.0 in), 23 December 1955 Dec
The wettest day on record for each calendar month at Black Mtn 2 WSW. The most was 203.5 mm (8.0 in) on 23 December 1955.
Record daily precipitation for each month at Black Mtn 2 WSW
MonthRecord daily precipitation (mm)Date
Jan123.2 mm (4.9 in)10 January 1995
Feb116.8 mm (4.6 in)13 February 1987
Mar87.6 mm (3.4 in)8 March 1986
Apr171.5 mm (6.8 in)4 April 1982
May58.7 mm (2.3 in)18 May 1957
Jun29.5 mm (1.2 in)9 June 1964
Jul12.4 mm (0.5 in)9 July 1974
Aug14.0 mm (0.6 in)19 August 1976
Sep89.4 mm (3.5 in)19 September 1959
Oct118.1 mm (4.6 in)13 October 1962
Nov101.6 mm (4.0 in)14 November 1981
Dec203.5 mm (8.0 in)23 December 1955

Latest Records

20
Latest records at Black Mtn 2 WSW
DateStationRecordValueBeat old record byOld record stoodSignificance
17 June 1995Black Mtn 2 WSW, USdaily rain (Tie)0.3 mm (0.01 in)tie20 years2 of 100 (Routine)
16 May 1995Black Mtn 2 WSW, USdaily rain7.9 mm (0.31 in)7.9 mm (0.31 in)40 years20 of 100 (Routine)
15 May 1995Black Mtn 2 WSW, USdaily rain11.9 mm (0.5 in)9.9 mm (0.39 in)16 years20 of 100 (Routine)
14 May 1995Black Mtn 2 WSW, USdaily rain13.0 mm (0.5 in)0.6 mm (0.02 in)37 years15 of 100 (Routine)
13 May 1995Black Mtn 2 WSW, USdaily rain28.7 mm (1.1 in)18.8 mm (0.7 in)37 years44 of 100 (Notable)
2 May 1995Black Mtn 2 WSW, USdaily rain22.4 mm (0.9 in)4.4 mm (0.17 in)37 years20 of 100 (Routine)
29 April 1995Black Mtn 2 WSW, USdaily rain10.9 mm (0.4 in)0.5 mm (0.02 in)12 years7 of 100 (Routine)
20 April 1995Black Mtn 2 WSW, USdaily rain15.5 mm (0.6 in)5.8 mm (0.23 in)40 years19 of 100 (Routine)
13 April 1995Black Mtn 2 WSW, USdaily rain10.7 mm (0.4 in)3.8 mm (0.15 in)33 years16 of 100 (Routine)
23 March 1995Black Mtn 2 WSW, USdaily rain60.7 mm (2.4 in)33.8 mm (1.3 in)32 years37 of 100 (Notable)
12 March 1995Black Mtn 2 WSW, USdaily rain18.5 mm (0.7 in)2.8 mm (0.11 in)8 years7 of 100 (Routine)
11 March 1995Black Mtn 2 WSW, USdaily rain85.1 mm (3.4 in)32.0 mm (1.3 in)40 years38 of 100 (Notable)
10 March 1995Black Mtn 2 WSW, USdaily rain80.0 mm (3.1 in)27.9 mm (1.1 in)8 years25 of 100 (Routine)
9 March 1995Black Mtn 2 WSW, USdaily rain49.5 mm (1.9 in)17.5 mm (0.7 in)40 years28 of 100 (Routine)
10 January 1995Black Mtn 2 WSW, USmonthly rain123.2 mm (4.9 in)13.2 mm (0.5 in)13 years23 of 100 (Routine)
13 December 1994Black Mtn 2 WSW, USdaily rain16.3 mm (0.6 in)6.9 mm (0.27 in)20 years13 of 100 (Routine)
5 October 1994Black Mtn 2 WSW, USdaily rain14.0 mm (0.6 in)8.7 mm (0.34 in)36 years19 of 100 (Routine)
6 May 1994Black Mtn 2 WSW, USdaily rain35.3 mm (1.4 in)21.8 mm (0.9 in)11 years42 of 100 (Notable)
26 April 1994Black Mtn 2 WSW, USdaily rain20.8 mm (0.8 in)1.7 mm (0.07 in)37 years16 of 100 (Routine)
20 February 1994Black Mtn 2 WSW, USdaily rain48.5 mm (1.9 in)5.3 mm (0.21 in)0 years6 of 100 (Routine)

Extremes by Year

1954 to 1995
Yearly extremes at Black Mtn 2 WSW: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)203.5 mm (8.0 in)195582.9 mm (3.3 in)42
Wettest five days (Rx5day)547.1 mm (21.5 in)1955166.2 mm (6.5 in)42
Longest dry spell (CDD)134 days196091 days42

Wettest day (Rx1day)

Wettest day (Rx1day) at Black Mtn 2 WSW by year The wettest day of the year at Black Mtn 2 WSW, 1954 to 1995. The record is 203.5 mm (8.0 in) in 1955, marked on the chart; the median year is 82.9 mm (3.3 in). 0501001502002501960197019801990Record: 203.5 mm (8.0 in) in 1955
The wettest day of the year at Black Mtn 2 WSW, 1954 to 1995. The record is 203.5 mm (8.0 in) in 1955, marked on the chart; the median year is 82.9 mm (3.3 in).
Wettest day (Rx1day) at Black Mtn 2 WSW by year
YearWettest day (Rx1day)
195476.7 mm (3.0 in)
1955203.5 mm (8.0 in)
195652.6 mm (2.1 in)
195788.9 mm (3.5 in)
195885.1 mm (3.4 in)
195989.4 mm (3.5 in)
196059.9 mm (2.4 in)
196145.2 mm (1.8 in)
1962118.1 mm (4.6 in)
1963108.0 mm (4.3 in)
1964101.6 mm (4.0 in)
196574.2 mm (2.9 in)
196649.3 mm (1.9 in)
196794.0 mm (3.7 in)
196888.9 mm (3.5 in)
1969100.8 mm (4.0 in)
197082.3 mm (3.2 in)
197150.8 mm (2.0 in)
197257.2 mm (2.3 in)
197396.8 mm (3.8 in)
197465.8 mm (2.6 in)
197556.6 mm (2.2 in)
197639.9 mm (1.6 in)
197761.7 mm (2.4 in)
197889.9 mm (3.5 in)
197972.6 mm (2.9 in)
198073.9 mm (2.9 in)
1981101.6 mm (4.0 in)
1982171.5 mm (6.8 in)
198386.4 mm (3.4 in)
198482.6 mm (3.3 in)
198575.7 mm (3.0 in)
198687.6 mm (3.4 in)
1987116.8 mm (4.6 in)
198855.6 mm (2.2 in)
198951.1 mm (2.0 in)
199053.6 mm (2.1 in)
1991100.3 mm (3.9 in)
199283.1 mm (3.3 in)
199391.4 mm (3.6 in)
199448.5 mm (1.9 in)
1995123.2 mm (4.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Black Mtn 2 WSW by year The wettest five days of the year at Black Mtn 2 WSW, 1954 to 1995. The record is 547.1 mm (21.5 in) in 1955, marked on the chart; the median year is 166.2 mm (6.5 in). 02004006001960197019801990Record: 547.1 mm (21.5 in) in 1955
The wettest five days of the year at Black Mtn 2 WSW, 1954 to 1995. The record is 547.1 mm (21.5 in) in 1955, marked on the chart; the median year is 166.2 mm (6.5 in).
Wettest five days (Rx5day) at Black Mtn 2 WSW by year
YearWettest five days (Rx5day)
1954143.5 mm (5.6 in)
1955547.1 mm (21.5 in)
1956121.2 mm (4.8 in)
1957182.1 mm (7.2 in)
1958202.5 mm (8.0 in)
1959178.8 mm (7.0 in)
196076.7 mm (3.0 in)
1961142.0 mm (5.6 in)
1962287.8 mm (11.3 in)
1963249.7 mm (9.8 in)
1964263.7 mm (10.4 in)
1965162.8 mm (6.4 in)
1966128.1 mm (5.0 in)
1967217.2 mm (8.6 in)
1968144.0 mm (5.7 in)
1969245.4 mm (9.7 in)
1970198.1 mm (7.8 in)
1971129.5 mm (5.1 in)
1972114.6 mm (4.5 in)
1973172.2 mm (6.8 in)
1974124.7 mm (4.9 in)
1975108.5 mm (4.3 in)
197682.9 mm (3.3 in)
197797.3 mm (3.8 in)
1978275.6 mm (10.9 in)
1979152.0 mm (6.0 in)
1980185.7 mm (7.3 in)
1981170.9 mm (6.7 in)
1982192.2 mm (7.6 in)
1983232.5 mm (9.2 in)
1984111.5 mm (4.4 in)
198598.0 mm (3.9 in)
1986339.9 mm (13.4 in)
1987134.3 mm (5.3 in)
198887.7 mm (3.5 in)
198975.2 mm (3.0 in)
1990112.8 mm (4.4 in)
1991169.6 mm (6.7 in)
1992207.4 mm (8.2 in)
1993179.9 mm (7.1 in)
199498.1 mm (3.9 in)
1995248.4 mm (9.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Black Mtn 2 WSW by year The longest dry spell of the year at Black Mtn 2 WSW, 1954 to 1995. The record is 134 days in 1960, marked on the chart; the median year is 91 days. 0501001501960197019801990Record: 134 days in 1960
The longest dry spell of the year at Black Mtn 2 WSW, 1954 to 1995. The record is 134 days in 1960, marked on the chart; the median year is 91 days.
Longest dry spell (CDD) at Black Mtn 2 WSW by year
YearLongest dry spell (CDD)
1954114 days
1955103 days
195696 days
1957109 days
195851 days
195994 days
1960134 days
1961107 days
196250 days
1963113 days
196482 days
196581 days
196666 days
1967109 days
196868 days
1969118 days
1970132 days
197188 days
197294 days
1973117 days
197483 days
197548 days
197653 days
197775 days
1978117 days
197975 days
1980100 days
1981128 days
198216 days
198332 days
1984115 days
198556 days
1986133 days
198781 days
1988128 days
198968 days
199078 days
199138 days
199275 days
1993120 days
1994120 days
199516 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.

Rainfall Return Levels

39 years, 1955 to 1994

A day with at least 76.5 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 163.0 mm (6.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Black Mtn 2 WSW: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years76.5 mm (3.0 in)
5 years101.0 mm (4.0 in)
10 years116.6 mm (4.6 in)
25 years135.8 mm (5.3 in)
50 years149.6 mm (5.9 in)Longer than the 39 years of record
100 years163.0 mm (6.4 in)Longer than the 39 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 39 years of values from 1955 to 1994.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 203.5 mm (8.0 in) in 1955; 118.1 mm (4.6 in) in 1962; 116.8 mm (4.6 in) in 1987.

Download the Data

  • Data for Black Mtn 2 WSW standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Black Mtn 2 WSW 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

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