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Built 2026-10-16 (16 October 2026)

Aliso Canyon Oat Mtn F Weather Records (USC00040115)

Record envelope, standing records and threshold days for Aliso Canyon Oat Mtn F (USC00040115), California, United States, with 44 years of record.

Key Facts for Aliso Canyon Oat Mtn F

  • Aliso Canyon Oat Mtn F (USC00040115) is a weather station in California, United States at 34.32 latitude and -118.55 longitude, 722 m (2,367 ft) above sea level.
  • The station reports from 1948 to 1991, 44 years of record.
  • 0 records set at Aliso Canyon Oat Mtn F still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Aliso Canyon Oat Mtn F set a daily record precipitation of 22.9 mm (0.9 in) on 28 May 1990.

About the Station

  • Location: California, United States, 34.32 latitude, -118.55 longitude.
  • Elevation: 722 m (2,367 ft).
  • Period of record: 1948 to 1991, 44 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 Aliso Canyon Oat Mtn F, with 2026 drawn through them The band shows the record high and record low for each calendar day at Aliso Canyon Oat Mtn F. 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 Aliso Canyon Oat Mtn F. 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 Aliso Canyon Oat Mtn F, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jann/an/an/an/a
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Marn/an/an/an/a
Aprn/an/an/an/a
Mayn/an/an/an/a
Junn/an/an/an/a
Juln/an/an/an/a
Augn/an/an/an/a
Sepn/an/an/an/a
Octn/an/an/an/a
Novn/an/an/an/a
Decn/an/an/an/a

Which Years Hold Standing Records

0 standing records
Standing records at Aliso Canyon Oat Mtn F by the year they were set 0 records at Aliso Canyon Oat Mtn F still stand. 00000000000
0 records at Aliso Canyon Oat Mtn F still stand.
Standing records at Aliso Canyon Oat Mtn F by the year they were set
Year setStanding records

Wettest Day of Each Month

Jan: 182.1 mm (7.2 in)
Record daily precipitation for each month at Aliso Canyon Oat Mtn F The wettest day on record for each calendar month at Aliso Canyon Oat Mtn F. The most was 182.1 mm (7.2 in) on 26 January 1956. 050100150200 Jan: 182.1 mm (7.2 in), 26 January 1956 Jan Feb: 129.5 mm (5.1 in), 17 February 1980 Feb Mar: 91.4 mm (3.6 in), 1 March 1983 Mar Apr: 74.2 mm (2.9 in), 30 April 1953 Apr May: 58.7 mm (2.3 in), 9 May 1956 May Jun: 10.7 mm (0.4 in), 10 June 1957 Jun Jul: 4.8 mm (0.19 in), 11 July 1969 Jul Aug: 83.3 mm (3.3 in), 17 August 1977 Aug Sep: 43.7 mm (1.7 in), 25 September 1986 Sep Oct: 63.8 mm (2.5 in), 31 October 1987 Oct Nov: 176.3 mm (6.9 in), 17 November 1965 Nov Dec: 138.2 mm (5.4 in), 29 December 1965 Dec
The wettest day on record for each calendar month at Aliso Canyon Oat Mtn F. The most was 182.1 mm (7.2 in) on 26 January 1956.
Record daily precipitation for each month at Aliso Canyon Oat Mtn F
MonthRecord daily precipitation (mm)Date
Jan182.1 mm (7.2 in)26 January 1956
Feb129.5 mm (5.1 in)17 February 1980
Mar91.4 mm (3.6 in)1 March 1983
Apr74.2 mm (2.9 in)30 April 1953
May58.7 mm (2.3 in)9 May 1956
Jun10.7 mm (0.4 in)10 June 1957
Jul4.8 mm (0.19 in)11 July 1969
Aug83.3 mm (3.3 in)17 August 1977
Sep43.7 mm (1.7 in)25 September 1986
Oct63.8 mm (2.5 in)31 October 1987
Nov176.3 mm (6.9 in)17 November 1965
Dec138.2 mm (5.4 in)29 December 1965

Latest Records

20
Latest records at Aliso Canyon Oat Mtn F
DateStationRecordValueBeat old record byOld record stoodSignificance
28 May 1990Aliso Canyon Oat Mtn F, USdaily rain22.9 mm (0.9 in)20.6 mm (0.8 in)19 years20 of 100 (Routine)
29 August 1988Aliso Canyon Oat Mtn F, USdaily rain0.3 mm (0.01 in)0.3 mm (0.01 in)40 years16 of 100 (Routine)
25 August 1988Aliso Canyon Oat Mtn F, USdaily rain0.3 mm (0.01 in)0.3 mm (0.01 in)40 years16 of 100 (Routine)
23 April 1988Aliso Canyon Oat Mtn F, USdaily rain6.9 mm (0.27 in)6.1 mm (0.24 in)32 years17 of 100 (Routine)
20 April 1988Aliso Canyon Oat Mtn F, USdaily rain43.2 mm (1.7 in)17.8 mm (0.7 in)5 years17 of 100 (Routine)
19 April 1988Aliso Canyon Oat Mtn F, USdaily rain28.4 mm (1.1 in)14.4 mm (0.6 in)21 years19 of 100 (Routine)
14 April 1988Aliso Canyon Oat Mtn F, USdaily rain23.6 mm (0.9 in)2.8 mm (0.11 in)17 years10 of 100 (Routine)
29 February 1988Aliso Canyon Oat Mtn F, USdaily rain25.9 mm (1.0 in)10.9 mm (0.4 in)28 years16 of 100 (Routine)
17 January 1988Aliso Canyon Oat Mtn F, USdaily rain54.6 mm (2.1 in)21.6 mm (0.9 in)9 years14 of 100 (Routine)
10 December 1987Aliso Canyon Oat Mtn F, USdaily rain25.9 mm (1.0 in)3.0 mm (0.12 in)4 years6 of 100 (Routine)
1 November 1987Aliso Canyon Oat Mtn F, USdaily rain22.4 mm (0.9 in)21.4 mm (0.8 in)22 years18 of 100 (Routine)
31 October 1987Aliso Canyon Oat Mtn F, USmonthly rain63.8 mm (2.5 in)20.6 mm (0.8 in)8 years37 of 100 (Notable)
22 October 1987Aliso Canyon Oat Mtn F, USdaily rain40.9 mm (1.6 in)28.2 mm (1.1 in)1 year33 of 100 (Routine)
12 October 1987Aliso Canyon Oat Mtn F, USdaily rain1.5 mm (0.06 in)1.2 mm (0.05 in)0 years5 of 100 (Routine)
21 July 1987Aliso Canyon Oat Mtn F, USdaily rain (Tie)0.5 mm (0.02 in)tie16 years2 of 100 (Routine)
18 July 1987Aliso Canyon Oat Mtn F, USdaily rain0.5 mm (0.02 in)0.5 mm (0.02 in)38 years15 of 100 (Routine)
17 July 1987Aliso Canyon Oat Mtn F, USdaily rain0.8 mm (0.03 in)0.8 mm (0.03 in)38 years15 of 100 (Routine)
9 July 1987Aliso Canyon Oat Mtn F, USdaily rain0.3 mm (0.01 in)0.3 mm (0.01 in)38 years15 of 100 (Routine)
4 June 1987Aliso Canyon Oat Mtn F, USdaily rain (Tie)0.3 mm (0.01 in)tie1 year1 of 100 (Routine)
2 June 1987Aliso Canyon Oat Mtn F, USdaily rain0.3 mm (0.01 in)0.3 mm (0.01 in)37 years15 of 100 (Routine)

Extremes by Year

1948 to 1991
Yearly extremes at Aliso Canyon Oat Mtn F: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)182.1 mm (7.2 in)195673.7 mm (2.9 in)43
Wettest five days (Rx5day)363.9 mm (14.3 in)1962109.2 mm (4.3 in)43
Longest dry spell (CDD)230 days1954119 days43

Wettest day (Rx1day)

Wettest day (Rx1day) at Aliso Canyon Oat Mtn F by year The wettest day of the year at Aliso Canyon Oat Mtn F, 1948 to 1991. The record is 182.1 mm (7.2 in) in 1956, marked on the chart; the median year is 73.7 mm (2.9 in). 05010015020019501960197019801990Record: 182.1 mm (7.2 in) in 1956
The wettest day of the year at Aliso Canyon Oat Mtn F, 1948 to 1991. The record is 182.1 mm (7.2 in) in 1956, marked on the chart; the median year is 73.7 mm (2.9 in).
Wettest day (Rx1day) at Aliso Canyon Oat Mtn F by year
YearWettest day (Rx1day)
194819.6 mm (0.8 in)
194959.7 mm (2.4 in)
195059.7 mm (2.4 in)
195171.4 mm (2.8 in)
1952108.5 mm (4.3 in)
195374.2 mm (2.9 in)
195486.1 mm (3.4 in)
195544.5 mm (1.8 in)
1956182.1 mm (7.2 in)
1957115.6 mm (4.6 in)
195872.1 mm (2.8 in)
195967.8 mm (2.7 in)
196059.7 mm (2.4 in)
196150.8 mm (2.0 in)
1962110.2 mm (4.3 in)
196351.1 mm (2.0 in)
196459.2 mm (2.3 in)
1965176.3 mm (6.9 in)
1966124.0 mm (4.9 in)
196783.6 mm (3.3 in)
196887.6 mm (3.4 in)
1969143.5 mm (5.6 in)
1970128.3 mm (5.1 in)
197174.7 mm (2.9 in)
197236.8 mm (1.4 in)
197391.7 mm (3.6 in)
197493.7 mm (3.7 in)
197560.7 mm (2.4 in)
197635.6 mm (1.4 in)
197783.3 mm (3.3 in)
197878.7 mm (3.1 in)
197983.8 mm (3.3 in)
1980129.5 mm (5.1 in)
198173.7 mm (2.9 in)
198273.7 mm (2.9 in)
198391.4 mm (3.6 in)
198444.2 mm (1.7 in)
198555.6 mm (2.2 in)
198666.0 mm (2.6 in)
198763.8 mm (2.5 in)
198854.6 mm (2.1 in)
198929.2 mm (1.1 in)
199022.9 mm (0.9 in)
1991n/a

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Aliso Canyon Oat Mtn F by year The wettest five days of the year at Aliso Canyon Oat Mtn F, 1948 to 1991. The record is 363.9 mm (14.3 in) in 1962, marked on the chart; the median year is 109.2 mm (4.3 in). 010020030040019501960197019801990Record: 363.9 mm (14.3 in) in 1962
The wettest five days of the year at Aliso Canyon Oat Mtn F, 1948 to 1991. The record is 363.9 mm (14.3 in) in 1962, marked on the chart; the median year is 109.2 mm (4.3 in).
Wettest five days (Rx5day) at Aliso Canyon Oat Mtn F by year
YearWettest five days (Rx5day)
194830.8 mm (1.2 in)
194967.4 mm (2.7 in)
195075.2 mm (3.0 in)
1951114.3 mm (4.5 in)
1952260.4 mm (10.3 in)
195374.2 mm (2.9 in)
195486.1 mm (3.4 in)
195564.1 mm (2.5 in)
1956273.8 mm (10.8 in)
1957176.9 mm (7.0 in)
1958126.6 mm (5.0 in)
195967.8 mm (2.7 in)
196084.9 mm (3.3 in)
196159.5 mm (2.3 in)
1962363.9 mm (14.3 in)
1963103.1 mm (4.1 in)
1964104.2 mm (4.1 in)
1965333.3 mm (13.1 in)
1966274.0 mm (10.8 in)
1967203.7 mm (8.0 in)
196898.5 mm (3.9 in)
1969294.9 mm (11.6 in)
1970173.8 mm (6.8 in)
1971175.1 mm (6.9 in)
197266.8 mm (2.6 in)
1973141.2 mm (5.6 in)
1974219.9 mm (8.7 in)
1975129.5 mm (5.1 in)
1976105.8 mm (4.2 in)
1977143.5 mm (5.6 in)
1978109.2 mm (4.3 in)
1979114.3 mm (4.5 in)
1980327.7 mm (12.9 in)
1981116.8 mm (4.6 in)
1982109.1 mm (4.3 in)
1983307.3 mm (12.1 in)
198497.8 mm (3.9 in)
198597.8 mm (3.9 in)
1986148.3 mm (5.8 in)
198792.6 mm (3.6 in)
198879.3 mm (3.1 in)
198947.3 mm (1.9 in)
199022.9 mm (0.9 in)
1991n/a

Longest dry spell (CDD)

Longest dry spell (CDD) at Aliso Canyon Oat Mtn F by year The longest dry spell of the year at Aliso Canyon Oat Mtn F, 1948 to 1991. The record is 230 days in 1954, marked on the chart; the median year is 119 days. 05010015020025019501960197019801990Record: 230 days in 1954
The longest dry spell of the year at Aliso Canyon Oat Mtn F, 1948 to 1991. The record is 230 days in 1954, marked on the chart; the median year is 119 days.
Longest dry spell (CDD) at Aliso Canyon Oat Mtn F by year
YearLongest dry spell (CDD)
1948109 days
1949172 days
195099 days
1951114 days
1952192 days
1953159 days
1954230 days
1955101 days
1956146 days
1957122 days
1958129 days
1959157 days
1960188 days
1961110 days
1962122 days
196382 days
196479 days
196570 days
1966132 days
1967119 days
196885 days
1969117 days
1970111 days
197186 days
1972104 days
1973199 days
1974160 days
1975113 days
197665 days
197784 days
1978132 days
197954 days
198061 days
1981220 days
1982123 days
1983104 days
198448 days
1985118 days
1986170 days
1987119 days
1988130 days
1989128 days
1990156 days
1991n/a

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

36 years, 1949 to 1987

A day with at least 73.8 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 215.9 mm (8.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Aliso Canyon Oat Mtn F: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years73.8 mm (2.9 in)
5 years104.1 mm (4.1 in)
10 years126.9 mm (5.0 in)
25 years159.4 mm (6.3 in)
50 years186.4 mm (7.3 in)Longer than the 36 years of record
100 years215.9 mm (8.5 in)Longer than the 36 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, 36 years of values from 1949 to 1987.

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: 182.1 mm (7.2 in) in 1956; 176.3 mm (6.9 in) in 1965; 143.5 mm (5.6 in) in 1969.

Download the Data

  • Data for Aliso Canyon Oat Mtn F standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Aliso Canyon Oat Mtn F 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).