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Data as of 2025-12-31
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Built 2026-10-15 (15 October 2026)

Mendota Dam Weather Records (USC00045528)

Record envelope, standing records and threshold days for Mendota Dam (USC00045528), California, United States, with 37 years of record.

Key Facts for Mendota Dam

  • Mendota Dam (USC00045528) is a weather station in California, United States at 36.78 latitude and -120.37 longitude, 52 m (171 ft) above sea level.
  • The station reports from 1948 to 1984, 37 years of record.
  • 0 records set at Mendota Dam still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Mendota Dam set a daily record precipitation of 2.0 mm (0.08 in) on 5 June 1984.

About the Station

  • Location: California, United States, 36.78 latitude, -120.37 longitude.
  • Elevation: 52 m (171 ft).
  • Period of record: 1948 to 1984, 37 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 Mendota Dam, with 2026 drawn through them The band shows the record high and record low for each calendar day at Mendota Dam. 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 Mendota Dam. 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 Mendota Dam, 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 Mendota Dam by the year they were set 0 records at Mendota Dam still stand. 00000000000
0 records at Mendota Dam still stand.
Standing records at Mendota Dam by the year they were set
Year setStanding records

Wettest Day of Each Month

Dec: 42.2 mm (1.7 in)
Record daily precipitation for each month at Mendota Dam The wettest day on record for each calendar month at Mendota Dam. The most was 42.2 mm (1.7 in) on 16 December 1962. 0204060 Jan: 24.1 mm (0.9 in), 25 January 1954 Jan Feb: 29.2 mm (1.1 in), 19 February 1958 Feb Mar: 36.3 mm (1.4 in), 25 March 1950 Mar Apr: 29.5 mm (1.2 in), 25 April 1978 Apr May: 23.4 mm (0.9 in), 19 May 1949 May Jun: 6.9 mm (0.27 in), 9 June 1954 Jun Jul: 2.0 mm (0.08 in), 31 July 1966 Jul Aug: 6.4 mm (0.25 in), 20 August 1976 Aug Sep: 26.2 mm (1.0 in), 19 September 1959 Sep Oct: 27.7 mm (1.1 in), 12 October 1948 Oct Nov: 37.1 mm (1.5 in), 6 November 1960 Nov Dec: 42.2 mm (1.7 in), 16 December 1962 Dec
The wettest day on record for each calendar month at Mendota Dam. The most was 42.2 mm (1.7 in) on 16 December 1962.
Record daily precipitation for each month at Mendota Dam
MonthRecord daily precipitation (mm)Date
Jan24.1 mm (0.9 in)25 January 1954
Feb29.2 mm (1.1 in)19 February 1958
Mar36.3 mm (1.4 in)25 March 1950
Apr29.5 mm (1.2 in)25 April 1978
May23.4 mm (0.9 in)19 May 1949
Jun6.9 mm (0.27 in)9 June 1954
Jul2.0 mm (0.08 in)31 July 1966
Aug6.4 mm (0.25 in)20 August 1976
Sep26.2 mm (1.0 in)19 September 1959
Oct27.7 mm (1.1 in)12 October 1948
Nov37.1 mm (1.5 in)6 November 1960
Dec42.2 mm (1.7 in)16 December 1962

Latest Records

20
Latest records at Mendota Dam
DateStationRecordValueBeat old record byOld record stoodSignificance
5 June 1984Mendota Dam, USdaily rain2.0 mm (0.08 in)2.0 mm (0.08 in)35 years15 of 100 (Routine)
25 November 1983Mendota Dam, USdaily rain6.4 mm (0.25 in)3.6 mm (0.14 in)17 years13 of 100 (Routine)
18 November 1983Mendota Dam, USdaily rain4.8 mm (0.19 in)1.2 mm (0.05 in)9 years6 of 100 (Routine)
1 October 1983Mendota Dam, USdaily rain14.7 mm (0.6 in)12.7 mm (0.5 in)6 years20 of 100 (Routine)
1 May 1983Mendota Dam, USdaily rain9.7 mm (0.38 in)3.9 mm (0.15 in)28 years20 of 100 (Routine)
28 April 1983Mendota Dam, USdaily rain8.1 mm (0.32 in)1.5 mm (0.06 in)12 years8 of 100 (Routine)
18 March 1983Mendota Dam, USdaily rain10.2 mm (0.4 in)5.6 mm (0.22 in)0 years12 of 100 (Routine)
11 March 1983Mendota Dam, USdaily rain9.1 mm (0.36 in)4.8 mm (0.19 in)9 years13 of 100 (Routine)
1 March 1983Mendota Dam, USdaily rain24.4 mm (1.0 in)8.7 mm (0.34 in)12 years20 of 100 (Routine)
6 February 1983Mendota Dam, USdaily rain9.1 mm (0.36 in)0.7 mm (0.03 in)7 years6 of 100 (Routine)
27 January 1983Mendota Dam, USdaily rain20.1 mm (0.8 in)7.1 mm (0.28 in)21 years20 of 100 (Routine)
23 January 1983Mendota Dam, USdaily rain23.1 mm (0.9 in)10.9 mm (0.4 in)1 year20 of 100 (Routine)
19 January 1983Mendota Dam, USdaily rain17.8 mm (0.7 in)4.3 mm (0.17 in)13 years15 of 100 (Routine)
22 December 1982Mendota Dam, USdaily rain16.0 mm (0.6 in)7.6 mm (0.30 in)4 years16 of 100 (Routine)
21 December 1982Mendota Dam, USdaily rain6.6 mm (0.26 in)4.6 mm (0.18 in)4 years11 of 100 (Routine)
30 November 1982Mendota Dam, USdaily rain20.6 mm (0.8 in)14.2 mm (0.6 in)12 years20 of 100 (Routine)
10 November 1982Mendota Dam, USdaily rain9.1 mm (0.36 in)2.7 mm (0.11 in)17 years12 of 100 (Routine)
9 November 1982Mendota Dam, USdaily rain6.4 mm (0.25 in)1.1 mm (0.04 in)32 years13 of 100 (Routine)
25 October 1982Mendota Dam, USdaily rain5.1 mm (0.20 in)2.6 mm (0.10 in)31 years16 of 100 (Routine)
26 September 1982Mendota Dam, USdaily rain12.7 mm (0.5 in)12.7 mm (0.5 in)33 years20 of 100 (Routine)

Extremes by Year

1948 to 1984
Yearly extremes at Mendota Dam: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)42.2 mm (1.7 in)196224.1 mm (0.9 in)37
Wettest five days (Rx5day)72.4 mm (2.9 in)197838.1 mm (1.5 in)37
Longest dry spell (CDD)191 days1981134 days37

Wettest day (Rx1day)

Wettest day (Rx1day) at Mendota Dam by year The wettest day of the year at Mendota Dam, 1948 to 1984. The record is 42.2 mm (1.7 in) in 1962, marked on the chart; the median year is 24.1 mm (0.9 in). 10203040501950196019701980Record: 42.2 mm (1.7 in) in 1962
The wettest day of the year at Mendota Dam, 1948 to 1984. The record is 42.2 mm (1.7 in) in 1962, marked on the chart; the median year is 24.1 mm (0.9 in).
Wettest day (Rx1day) at Mendota Dam by year
YearWettest day (Rx1day)
194827.7 mm (1.1 in)
194923.4 mm (0.9 in)
195036.3 mm (1.4 in)
195119.1 mm (0.8 in)
195222.1 mm (0.9 in)
195320.8 mm (0.8 in)
195424.1 mm (0.9 in)
195535.1 mm (1.4 in)
195613.2 mm (0.5 in)
195725.4 mm (1.0 in)
195829.2 mm (1.1 in)
195926.2 mm (1.0 in)
196037.1 mm (1.5 in)
196126.9 mm (1.1 in)
196242.2 mm (1.7 in)
196324.9 mm (1.0 in)
196418.0 mm (0.7 in)
196522.9 mm (0.9 in)
196633.0 mm (1.3 in)
196715.2 mm (0.6 in)
196818.8 mm (0.7 in)
196923.4 mm (0.9 in)
197018.3 mm (0.7 in)
197116.8 mm (0.7 in)
197225.4 mm (1.0 in)
197322.9 mm (0.9 in)
197420.3 mm (0.8 in)
197519.8 mm (0.8 in)
197621.6 mm (0.9 in)
197717.3 mm (0.7 in)
197829.5 mm (1.2 in)
197926.4 mm (1.0 in)
198026.4 mm (1.0 in)
198127.7 mm (1.1 in)
198225.4 mm (1.0 in)
198324.4 mm (1.0 in)
198410.7 mm (0.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Mendota Dam by year The wettest five days of the year at Mendota Dam, 1948 to 1984. The record is 72.4 mm (2.9 in) in 1978, marked on the chart; the median year is 38.1 mm (1.5 in). 0204060801950196019701980Record: 72.4 mm (2.9 in) in 1978
The wettest five days of the year at Mendota Dam, 1948 to 1984. The record is 72.4 mm (2.9 in) in 1978, marked on the chart; the median year is 38.1 mm (1.5 in).
Wettest five days (Rx5day) at Mendota Dam by year
YearWettest five days (Rx5day)
194827.7 mm (1.1 in)
194927.7 mm (1.1 in)
195039.6 mm (1.6 in)
195128.0 mm (1.1 in)
195226.5 mm (1.0 in)
195320.8 mm (0.8 in)
195426.5 mm (1.0 in)
195569.4 mm (2.7 in)
195619.6 mm (0.8 in)
195733.3 mm (1.3 in)
195847.2 mm (1.9 in)
195928.7 mm (1.1 in)
196040.9 mm (1.6 in)
196142.5 mm (1.7 in)
196258.1 mm (2.3 in)
196355.6 mm (2.2 in)
196429.5 mm (1.2 in)
196551.1 mm (2.0 in)
196665.7 mm (2.6 in)
196731.1 mm (1.2 in)
196823.6 mm (0.9 in)
196950.8 mm (2.0 in)
197044.9 mm (1.8 in)
197120.4 mm (0.8 in)
197261.9 mm (2.4 in)
197357.4 mm (2.3 in)
197435.3 mm (1.4 in)
197533.8 mm (1.3 in)
197650.5 mm (2.0 in)
197736.2 mm (1.4 in)
197872.4 mm (2.9 in)
197936.8 mm (1.4 in)
198052.4 mm (2.1 in)
198138.1 mm (1.5 in)
198240.9 mm (1.6 in)
198357.2 mm (2.3 in)
198416.3 mm (0.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Mendota Dam by year The longest dry spell of the year at Mendota Dam, 1948 to 1984. The record is 191 days in 1981, marked on the chart; the median year is 134 days. 501001502001950196019701980Record: 191 days in 1981
The longest dry spell of the year at Mendota Dam, 1948 to 1984. The record is 191 days in 1981, marked on the chart; the median year is 134 days.
Longest dry spell (CDD) at Mendota Dam by year
YearLongest dry spell (CDD)
1948103 days
1949171 days
1950135 days
1951173 days
1952132 days
1953133 days
1954155 days
1955189 days
1956121 days
1957111 days
195895 days
1959138 days
1960190 days
1961183 days
1962149 days
196385 days
1964140 days
196593 days
196681 days
1967134 days
196890 days
196989 days
1970176 days
1971167 days
1972108 days
1973129 days
1974161 days
1975114 days
1976129 days
1977148 days
1978126 days
1979164 days
1980154 days
1981191 days
198285 days
1983151 days
1984117 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

33 years, 1949 to 1982

A day with at least 23.4 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 45.1 mm (1.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Mendota Dam: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years23.4 mm (0.9 in)
5 years29.3 mm (1.2 in)
10 years33.2 mm (1.3 in)
25 years38.1 mm (1.5 in)
50 years41.6 mm (1.6 in)Longer than the 33 years of record
100 years45.1 mm (1.8 in)Longer than the 33 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, 33 years of values from 1949 to 1982.

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: 42.2 mm (1.7 in) in 1962; 37.1 mm (1.5 in) in 1960; 36.3 mm (1.4 in) in 1950.

Download the Data

  • Data for Mendota Dam standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Mendota Dam 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).